Home

System Library User`s Manual

1. Table 2 1 Definition of rms Sector Basic units of data handled by a CD block 2352 bytes fixed The sector size and configuration follows the CD ROM format Stream Distinguished by sector headers and subheaders Flow of logically continuous data CD Buffer Buffer within the CD block that stores sector data CD Buffer Size Size of CD buffer sector units Buffer Partition Segments CD buffer into multiple logical partitions Can be considered logical elements getting and storing streams Buffer Partition Size Size of buffer partition sector units Sector Location Sector locations within buffer partition location of sector units Takes the value of 0 to buffer partition size 1 Sectors of the buffer partition key in the sector location and accesses Logical element that separates streams by set conditions Selector Composed from the filter and buffer partition logical element that selects streams The selector enables the construction of a stream select circuit Logical apparatus that causes and absorbs streams such as a CD ROM and MPEG The stream select process is enabled by connecting a device to the circuit mentioned above Terminal for connecting a filter buffer partition or device Frame Address FAD Continually adds numbers in frame units with the absolute time 00 00 00 on the CD as 0 Corresponds 1 to 1 with absolute time The CD block accesses the frame address as a key and not absolute time both CD ROM
2. The polling process by continuously issuing commands is prohibited Regular response and the interrupt factor register are used in the polling of condi tion changes Use of timing through the CSCT and SCDQ flags and VSYNC issues commands System Library User s Guide 29 Command End Flag The end of execution of each command listed below is posted Table 3 2 Commands belonging to the Command End Flag Flag O Commana O O e Set CD device connection source Set filter frame address range e Set filter subheader conditions e Set filter mode e Set filter connection destination e Reset selector e Calculate actual data size e Execute frame address find e Set sector length EHST e Fetch sector data e Cancel sector data e Cancel sector data fetch e Write sector data ECPY e Copy sector data e Move sector data EFLS e Move directory e Save file information e Read file a The ESEL flag also posts the end of soft reset execution b The EFLS flag is 1 when opening the tray and when stopping file access Command End Flag Process in CD Communication Interface When commands belonging to the command end flag are issued the CD communi cation interface function does the following a Checks the command end flag and if 0 does not issue a command b If 1 the command end flag is cleared to 0 and a command is issued The command end flag is processed when the following commands are issued e Soft reset Clears ESEL flag to
3. Writes sector data to the designated filter Data must be transferred and written after the function is executed Data of the designated sector number is written even if data transfer is interrupted Values except for transferred data are not fixed Title Function Function Name SR No Function Specs Copy sector data CDC_CopySctData 7 6 Format Input Output Function value Function CdcRet CDC_CopySctData Sint32 srcbn Sint32 spos Sint32 snum Sint32 dstfln srcbn copy source buffer partition number spos sector postion CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition dstfln copy destination filter number none Returns the return code Copies sector data from designated sector range of the buffer partition Copies in between selectors Title Function Function Name SR No Function Specs Move sector data CDC_MoveSctData 7 7 Format Input Output Function value Function CdcRet CDC_MoveSctData Sint32 srcbn Sint32 spos Sint32 snum Sint32 dstfln srcbn move source buffer partition number spos sector postion CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition dstfIn copy destination filter number none Returns the return code Moves sector data from designated sector range of the buffer p
4. CD drive status and CD report contents are shown below The FFH rows mean invalid values Status CD flag repeat ControvADR Track No Index No Frame address pause o amo ot oT ener sm Ome o o o o SEEK gt O target positon Target postion target positon target postion scans E IRo fo T o T o FFH FFH FFH FFH FFH FFH FFH FFH mem pT oto to o FFH FFH FFH FFH O Current value Seek Home seek stop against home position When the standby time expires and the status changes from lt PAUSE gt to lt STANDBY gt the value when paused is saved Z e Y 60 5 When CD report content is an ineffective value a The value immediately before the repeat frequency is saved If changing to a different status returns to the retaind value b Moves to the start FAD 150 of the disk if the status changes from Seek Home to lt PAUSE gt c The value immediately before lt ERROR gt is retained If changing to the lt PAUSE gt status returns to the retained value d Midway during the lt BUSY gt status the ineffective value returns in some cases when changing to a different status System Library User s Guide 61 7 2 5 Subcode Information Title Data Data Name No Data Specification Subcode Information 5 0 1 Subcode Q Information a When Adr 1 byte 1 2 3 4 5 6 7 8 9 10 Ctrl TNO X P_FAD Q_FAD CRC Adr Ctrl Adr CONTROL ADR byte TNO Track No binary value not B
5. 1 2 Scanning continues until a CD drive command CD play seek etc is issued Scan is canceled and a pause occurs if the play range is exceeded The pause position at that time is undefined Scan Direction CDC_SCAN_FWD Fast forward scan forward direction CDC_SCAN_RVS Fast reverse scan reverse direction Sound Output If scanning from the lt PLAY gt status 12 dB sounds are output in the CD DA region Sound is muted if scanning in the CD ROM area or in the lt PAUSE gt status If the scan direction in near the play range boundary is reversed the sound may not be output Remarks When the CD ROM area is scanned sector data will not be read 84 8 2 3 Subcode Title Function Function Name S No Function Get subcode Q CDC_TgetScdQch 3 1 Specifications Format CdcRet CDC_TgetScdQch Uint16 qcode Input none Output qcode Subcode Q information 5 words Function value Returns the return code Function Gets subcode Q channel information 10 bytes other than CRC Title Function Function Name S No Function Get subcode R W CDC_TgetScdRwch 3 2 Specifications Format CdcRet CDC_TgetScdRwch Uint16 rwcode Sint32 scdflag Input none Output rwcode Subcode R W information 12 words scdflag Subcode flag effective bits are insignificant Function value Returns the return code Function Gets subcode R W channel information 1 pack of 24 bytes 1 Subcode Flag Shows
6. bufno Storage destination buffer partition number CDC_NUL_SEL displays non storage Function value Returns the return code Function Gets the buffer partition number of the storage destination of the sector last read from the CD 86 aN 8 2 5 Selector See selector reset for the initial value of the selector set parameters Title Function Function Name SR No Function Specs Set filter frame address range CDC_SetFiltRange 5 1 Format CdcRet CDC_SetFiltRange Sint32 filtno Sint32 fad Sint32 fasnum Input filtno filter number fad starting frame address fasnum frame address sector number 0 effective FAD range does not exist Output none Function value Returns the return code Function Sets the frame address range for the filter When fasnum 0 all sectors are output to false output connectors if the FAD range of the filter mode is effective Title Function Function Name S No Function Specs Get filter frame address range CDC_GetFiltRange 5 2 Format CdcRet CDC_GetFiltRange Sint32 filtno Sint32 fad Sint32 fasnum Input filtno filter number Output fad starting frame address fasnum frame address sector number Function value Returns the return code Function Gets the frame address range for the filter Function Specs Set filter subheader conditions CDC_SetFiltSubh 5 3 Format CdcRet CDC_SetFiltSubh Sint32 filtno CdcSubh subh Input filtno filter number su
7. GUIDE sep ed See asc sta og ech a A 1 Did ExplanatiON sinnt eree ne aSr aT EEEE KETENE a 1 2 0 REFERENCE aptae a Sock a 3 21 Listof PUN CU OINS ssrisssnnpnseniisrea raina 3 2 2 Function Specifications isd scnsestrgniraacon mavenitbuacecoduecqente 3 SMPC I F USER S MANUAL ys ulencivciyesuuscuisus sinsanciniesvadeeintenrctachipulllll 7 TO GUIDE sninn a a eai a al 7 LD Objective ssiri iosian SE OE 7 1 2 Overview ce At 7 1 3 System Management System fee Mmm 7 1 4 Peripheral Control System Mpc Nea 8 2 0 REFERENCE seansda enneint Miah ok N 11 2 1 Data Specification List ccccccss Ron onanan 11 2 2 Data Specifications esessses ivi viwovatnignsecsspemmmmasstecenc pp tne 11 2 3 List of Function Specifications WRpes cscs 15 2 4 Function Specifications s ss ssteseetessesessseseesesrersteseeseeses 16 CD COMMUNICATION INTERFACE USER S MANUAL 21 TO OVERVIEW iieii drdi Aei oiir 21 1 1 Library Configuration s sssseeserissiesesisressrsesississsresssenees 21 1 2 System Configuration ss se seetessssssssiesssstestesseseestesseseesesse 22 1 3 Functions and Characteristics ccccceeeeeeeseeeeeeeeees 23 2 0 BASIC FACTS igiaiic ania eles ss MMI es vec uceevs haa ede shauntes 24 2 1 Terminology and Symbols vei csiccuccucesginteseetsicseetivccnnaivie 24 22 NTS LAV Oia isin a a a a a eane ee 26 3 0 COMMUNICATION WITH THE CD BLOCK c cece 27 3 1 Communication Register s o
8. L Data Transfer MPEG Registe Register RGB Get Put Get CD Block RGB555 Figure 5 1 CD Block Entire Data Flow System Library User s Guide 41 5 2 Stream Process Mechanism Figure 5 2 shows the overall configuration of the CD block from the viewpoint of stream flow There are 24 selectors numbered 0 to 23 Selector Stream outflow device Filter Buffer partition Stream inflow device lt O MPEG decoder A MPEG decoder V MPEG frame buffer S L Copy Move Device output connector O MPEG buffer D Device input connector Filteniipubconnactor A Partition output connector False output connector Figure 5 2 CD Block Overall Configuration What each part does a Device Produces and absorbs streams stream inflow and outflow device b Selector Composed of a filter and buffer partition used for selecting streams c Filter Separates streams by set conditions conforms to Yes No conditions d Buffer Partition Stores streams releases or cancels data through outside requests There are connectors for connecting every device to a selector The device and selector input output connectors are 1 to 1 Connections can be made between selectors as well Connections flow regularly in streams by connecting connectors that don t pass through partitions and stop when entering a partition Sectors that are output from an output connector that is not connected will be canceled Devices must be con
9. Restart unchanged selection play from current position cancel pause CDC_PLY_STYPE amp ply CDC_PTYPE_NOCHG CDC_PLY_ETYPE amp ply CDC_PTYPE_NOCHG CDC_PLY_PMODE amp ply CDC_PM_NOCHG Title Function Function Name SR No Seek play position CDC_CdSeek 2 2 Specifications Function Format CdcRet CDC_CdSeek CdcPos pos Input pos position parameters Output none Function value Returns the return code Function Moves seeks the play position pickup according to the designated position parameters Example 1 Frame Address Designation CdcPos pos definition of position parameter variable CDC_POS PTYPE amp pos CDC_PTYPE_FAD CDC_POS_FAD amp pos fad frame address ret CDC_CdSeek amp pos seek start 2 Track Index Designation CDC_POS PTYPE amp pos CDC PTYPE_TNO CDC_POS_TNO amp pos tno track number f CDC_POS_IDX amp pos X index number 3 CD Play Stop Default vlaue designation Seek home position Stop CDC_POS PTYPE amp pos CDC _PTYPE_DFL 4 Pause CD Play No changed selection seek current position Pause CDC_POS_PTYPE amp pos CDC_PTYPE_NOCHG System Library User s Guide 83 Title Function Function Name SR No Function Scan CDC_CdScan 2 3 Specifications Format CdcRet CDC_CdScan Sint32 scandir Input scandir Scan direction Output none Function value Returns the return code Function Scans the CD
10. Rights Reserved READER CORRECTION COMMENT SHEET Keep us updated If you should come across any incorrect or outdated information while reading through the attached document or come up with any questions or comments please let us know so that we can make the required changes in subsequent revisions Simply fill out all information below and return this form to the Developer Technical Support Manager at the address below Please make more copies of this form if more space is needed Thank you General Information Your Name Phone Document number ST 162 062094 Date Document name System Library User s Guide Corrections Questions comments Where to send your corrections 415 802 3963 Mail SEGA OF AMERICA Attn Manager Attn Manager Developer Technical Support Developer Technical Support 275 Shoreline Dr Ste 500 Redwood City CA 94065 REFERENCES In translating creating this document certain technical words and or phrases were interpreted with the assistance of the technical literature listed below 1 KenKyusha New Japanese English Dictionary 1974 Edition 2 Nelson s Japanese English Character Dictionary 2nd revised version 3 Microsoft Computer Dictionary 4 Japanese English Computer Terms Dictionary Nichigai Associates 4th version This page is blank in the original Japanese document Table of Contents SYSTEM PROGRAM USER S MANUAL i ccivescitsiivaittaces Rin emitrdecutvrs 1 LO
11. in progress on arrow line c The tray close command specifies drive commands other than tray open The status corresponding to every command changes after the tray is closed Example Play command in the lt OPEN gt status changes to the lt PLAY gt status after the tray is closed Y 34 2 Status Change Illustration of an Error System Figure 4 2 illustrates the status change of a CD drive in an error system Statuses are explained in Table 4 3 Tray Close Command e Manual Close Hard Reset Tray Open Command Manual Open NODISC e CD Block Initialize Command Yes Stop Command e Pause Command Each Command Automatic a Retry Succeeded PLAY 1 S Read Data Error Fatal Error Figure 4 2 Illustration of CD Drive Status Change Error System Table 4 3 Error Relationship Status Status Explanation Internal Status lt RETRY gt lt PLAY gt if retry succeeds and lt ERRORP gt if retry fails lt SEEK gt lt ERROR gt Status does not change until the next drive command lt PAUSE gt is issued lt FATAL gt Stops the disc motor rotation Hard reset is required lt STANDBY gt Internal conditions indicate equal conditions as CD block internal operations System Library User s Guide 35 4 1 2 Table of CD Drive Status Changes Table 4 4 lists status changes of the CD drive For example if the pause command is issued during lt PLAY gt lt PAUSE gt will be displayed Table 4 4 Table of
12. lt BUSY gt status when done by command b In some cases the routing is by way of lt SEEK gt when changing to the lt PLAY gt and lt SCAN gt statuses 4 In the case of Multi Sessions a Reads the final session of TOC b After TOC is read the lt PAUSE gt status is at the 0 frame 2 seconds from the start position of the final session 36 4 2 CD Drive Operation lt PLAY gt Status FrameAddress The frame address currently FAD posted while a CD is playing indicates the sector during the read process The current FAD sector is not stored in the CD buffer and cannot be retrieved The host can access up to one sector before the current FAD In the case of a CD ROM FAD 1 Current FAD L L EN AS Store in CD buffer During Read process retrievable not retrievable Figure 4 3 Sectors that the current FAD indicates When play has ended FAD play end position 1 The read out area is indicated when the play end position concludes at the end of the disc Change from lt PL amp gt Status and Sector Storage When changing from lt PLAY gt to a different status whether the sector during the read process can be store is undefined If changing to any status other than lt BUSY gt the sector that should be stored is defined When the pause command is issued in the lt PLAY gt status and the status changes from lt PLAY gt to lt PAUSES the storage sector 1 FAD is posted the same as with 1 Play Range and Fr
13. ocean teualieetresutovendlearecrante atintem 27 3 2 Communication Method sss ssssisssiisssiersieersssresesreessens 29 3 3 Regponse A Weel sci ceed bea teishige sreetreerrerernsrterestnseressnees 31 34 Dfa TEOGISLCE T oiii inekten kesiii iini 32 iii AlO CODRIN Bevetseccetsece aes ee ee 33 4 1 CD Drive Status Change e cccssscceessseicciaschctasieestettes 33 4 2 CD Drive Operation sssessssssssesesssessssesesesesesesses 37 AB oT 01e 318 AE E E ddueedecstuidicitcbaeteoe 39 5 0 CD BLOCK CONFIGURATION eceerceeerreesrreees 41 SE Data FloW aerea e E E TE e 41 5 2 Stream Process Mechanism cccssccceseceeeeceeeees 42 5 3 Selector Configuration cig aseviid ietetenetasideaiiens 43 5 4 Sector Data Format u cccccicccccccceceesesesssesesesens 48 5 5 CD Block Initialization oo lee eeeeeeeceeceesesseeees 49 6 0 CD BLOCK FILE SYSTEM eeeeeeeececesceesssseeeeeeee 50 6 1 File Management in CD ROM ISO9660 50 6 2 CD Block File System Functions ccecseeeees 51 7 0 DATA SPECIFICATIONS 1 ec ceceesssssscccsceessssseeeeeee 55 7 Data Lista neradan hecteek cece nee sip oo Meee 55 7 2 Data Detailed 0 cc c ccccceece set A Se 56 8 0 FUNCTION SPECIFICATIONS ccc cece ceeseseeeees 73 8 1 List of Functions oo elec ccceeeesssseeccseesnesseeeeeees 74 8 2 Function Details ceceseeseecescsessnesceseeceesesseeees 76 VOX else ees vs EE A EEEE A oh CL recounts 104 iv Pages 1 20 of th
14. operation The operation selector designates through the filter number Title Function Function Name SR No Function Hold file information CDC_ReadDir 8 2 Specifications Format CdcRet CDC_ReadDir Sint32 filtno Sint32 fid Input filtno filter number fid file identifier Output none Function value Returns the return code Function Reads the directory record of the current directory and holds up to 254 pieces of file information after the designated file identifier own and parent are always retained Remarks The CD block file system uses the selector in the operation The operation selector designates through the filter number Title Function Function Name S No Function Get holding file information range CDC_GetFileScope 8 3 Specifications Format CdcRet CDC_GetFileScope Sint32 fid Sint32 infnum Input none Output fid first file identifier being held infnum number of file information being held Function value Returns the return code Function Returns the file information range held by the current CD block Remarks Since the self and parent directories are always held they are not included in the file information number Title Function Function Name S No Function Get holding file information CDC_TgetFilelnfo 8 4 Specifications Format CdcRet CDC_TgetFilelnfo Sint32 fid CdcFile file Input fid file identifier CDC_NUL_FID shows entire file information Output file f
15. or changing disks Neither a table can be created nor the file system used if the disk is not in the ISO9660 format REJECT occurs if getting theholding file information range 2 Holding File Information The file system can access only files inside the file information table When accessing a file the file information must be held beforehand When moving directories the target directory must be held 3 Reading Files File identifier and offset sector units are selected and the file read The read destination selector is selected by the filter number 4 Getting Sector Data Files read to the buffer partition transfer and fetch data by fetching sector data Data can be fetched while reading and there is no waiting for read to end Pause occurs if the CD buffer becomes full while reading files If a space can be created pause is canceled and the remaining files read 5 Ending File Read When file read has ended the EFLS flag of the interrupt factor register becomes 1 Executing the file access stop command stops file read Accessing a file is done in the same by moving a directory and holding file information 52 6 2 3 File System Precautions 1 Work Selector Designation When reading file information from the CD ROM the CD block requires a work selector One selector can be designated to move a directory and hold file information At least one empty sector is required at this time The selector used is canceled after
16. process stops because of an error etc System Library User s Guide 47 5 4 Sector Data Format 1 Basic Format Sector data format basically conforms to the CD ROM XA sector format 2352 bytes gt 7 2340 bytes ___ gt gt oa bytes gt 288 bytes CD ROM Mode 1 S Header User Data EDC ECC etc 280 bytes CD ROM XA Mode 2 Sect Form1 Synon Header BUN c User Data EDC ECC 2324 4 bytes CD ROM XA ERN Mode 2 Header EDC Form 2 synch Pader User Data EDC 4 bytes repeat FN CN SM Cl FN File Number SM Sub Mode CN Channel Number Cl Coding Information a byte Figure 5 8 CD ROM XA Sector Format 2 Handling Sub header and User Data 2048 bytes a Sub header except for Mode 2 mode part within header is 02H is handled as 0 b There is user data immediately after the header only for Mode 1 mode part within header is 01H Otherwise user data is considered to exist in the same position as mode 2 form 1 c Storing user data within a buffer partition except data from a CD device is the same as mode 2 form 1 The first 24 bytes is 0 and data after the user data is undefined Z Q pa 48 5 5 CD Block Initialization TOC Session Information Initialized when the tray is opened and information is in a non input condition Reads TOC when tray is closed unrelated to the reset of software File Information Initialized if tray is opened or software i
17. the process ends 2 Selector Settings When accessing to a file the file system does the following settings for the selector a Connection conditions of indicated filter e filter input connector connects with a CD device e true output connector connects with buffer partition with the same number e false output connector cuts off other selectors b Filter conditions Table 6 1 Set Filter Condition Move Directory e Sets filter frame address range FAD range Hold File Information e Makes effective the frame address range of the filter mode e Sets filter frame address range Read Files e Sets the file number of the filter subheader conditions e Makes effective the filter mode FAD range and file number selection c Filter and connected buffer partition The buffer partition sectors are cleared before files are accessed 3 CD Play Range and Drive Command When accessing a file the play range becomes the default value disk first to last The drive command CD play pause etc is executed unchanged even with the file system in operation Be aware that operation of the file system can be obstructed Auto pause cancel pause operate normally when the buffer is full 4 File Access End and Stop When file access ends or is stopped the EFLS flag becomes 1 File access also stops if the tray is open But before the lt OPEN gt status EFLS 1 While directory move and file information hold are being executed th
18. word number of effective data transfered by the CD block The normal word number can not be exceeded entire number of words that should be transfered CDC_DEND_ERR Error occurred by data transfer Data transfer end is executed even though it isn t time for transfer 2 Relationship of Transfer Word Number Data transfer conditions can be checked by comparing the host transfer word number word number transfered by the host until data transfer end is executed and the CD block transfer word number Transfer Conditions Host Transfer Word Number CD Block Transfer Word Number cdwnum Host Word Number When gettng CD host When writing host gt CD Transfer interrupt host word no lt normal word no cdwnum gt host word number cdwnum host word number Transfer all host word no normal word no cdwnum normal word number host word number Excess transfer host word no gt normal word no cdwnum normal word number lt host word number e Transfer interrupt Stops data transfer while in progress e Transfer all All data is transfered e Excess transfer Normal word number is exceeded and transfered Excess part is transfered as dummy data System Library User s Guide 81 8 2 2 CD Drive For tray open close in the lt OPEN gt and lt NODISC gt statuses see Initialize CD block Title Function Specifications Format Input Output Function value Function Remarks Example 8
19. 0 no check e Gets actual data size Checks ESEL flag not cleared to 0 e Gets frame address find results Checks ESEL flag not cleared to 0 e Stop file access Clears EFLS flag to 0 no check 30 3 3 Response Response Contents Response is composed of a 1 byte status and 7 byte report The status are common but the report depends on the command This most basic of reports is the CD report Status The following information returns to status e REJECT improper command Command itself is invalid due to mistake in command format e WAIT hold execute Cannot be executed under current conditions therefore command can not be received e Data transfer request Shows that data transfer is necessary e Periodic response Shows whether a periodic response or response to a command e CD drive condition Shows the logical condition of the CD drive seen from the host a Response during REJECT is invalid b Status during WAIT and CD report are effective but other reports are ineffective Periodic Response Periodic response is a response that returns with the communication timing of the CD block with the CD drive The host can obtain information status and CD report without issuing a command It is periodically updated by the communication cycle with the CD drive Same as the SCDQ flag update timing At standard playing speed 13 3 ms Periodic response update cycle t At double playing speed 6 7 ms When not pl
20. 2 Function Function Name SR No CD play CDC_CdPlay 2 1 CdcRet CDC caP Lay CdcPly ply ply play parameters none Returns the return code Plays CDs according to the designated play parameters Plays music in the CD DA area Reads sector data in the CD ROM area In playing CD DA mute is canceled 4 frames prior to the start position to prevent the start of a song from being cut off 1 Frame Address Designation CdcPly ply definition of play parameter variable CDC_PLY_STYPE amp ply CDC_PTYPE_FAD CDC_PLY_SFAD amp ply fad start frame address CDC_PLY_ETYPE amp ply CDC_PTYPE_FAD CDC_PLY_EFAS amp ply fasnum frame address sector number 7 CDC_PLY_PMODE amp ply pmode play mode ret CDC_CdPlay amp ply play start 3 2 Track Index Designation CDC_PLY_STYPE amp ply CDC_PTYPE_TNO CDC_PLY_STNO amp ply tno1 start track number CDC_PLY_SIDX amp ply CDC_PLY_ETYPE amp ply CDC_PTYPE TNO x1 start index number CDC_PLY_ETNO amp ply tno2 end track number a CDC _PLY_EIDX amp ply X2 end index number aL CDC _PLY_PMODE amp ply pmode play mode oh 3 Default Value Designation 4 CDC_PLY_STYPE amp ply CDC_PTYPE_DFL start position is first of disc CDC_PLY_ETYPE amp ply CDC_PTYPE_DFL end position is end of disc CDC_PLY_PMODE amp ply CDC_PM_DFL no repeat move pickup CD Play
21. Buffer Partition 1 Buffer Partition Configuration The CD buffer is divided into several buffer partitions Figure 5 5 shows the configuration of a buffer partition Buffer partition number Last partition Sector postion First partition Np 1 2 0 Buffer partition size sector units Np Nz 1 2 1 0 23 23 Np buffer partition size P buffer partition number Tp lt CD buffer size Contents of each partition are not fixed data can be stored as long as there is space in the whole CD buffer Figure 5 5 Buffer Partition Configuration 2 Storing Sectors to the Buffer Partition Sectors entered in partitions are stored in the last partition The last sector position of the partition is equal to the buffer partition size minus 1 3 Discharging and Canceling Sectors from the Buffer Partition Two ways to discharge sectors from partitions are to keep the sectors at the partition discharge source or clear the sectors clear only can also be selected For example get to the host corresponds to Get and Get and Clear Flowing in and out between selectors corresponds to Copy and Move 4 CD 1 Sector Interrupt and Store Destination One sector interrupt in CD read occurs in each sector at the time the sector is stored in the partition The CD block stores the partition number of the store destination The store destination partition number of the sector read last can be retrieved from the host 44 5 3 3
22. CD X Index No binary value not BCD P_FAD Time within track frame address format with track lead at 0 Q FAD Absolute time frame address format with 00 00 00 at 0 The content in each status is the same as for the CD report Values in read in and read out are shown in the table below Can be acquired by multi session TNO 01H 63H 1 99 01H 63H Elapsed FAD within track AAH Read Out 01H 63H Elapsed FAD within track 00H Read In 01H 63H AOH A1H A2H 000000H Read in of the first session is Q FAD 000000H Normally cannot be acquired b In other cases the subcode Q value unchanged 10 bytes except CRC 2 Subcode R W Information bit r 24 bytes Packet corresponds to1 frame 1 sector 96 bytes 24 bytes 24 bytes 24 bytes unused padded by 0 Subcode R W is decoded in 1 pack units 24 bytes 12 words The CD block has an internal pack buffer of 23 packs short of 6 packets ces 7 2 6 Data Type Title Data Data Name Data Specification CD Communication Function Return CdcRet Code 1 Return Code CdcRet ret Be sure ret is not the pointer CDC_RET_ERR ret Sint 16 CDC_RET STATUS rl Constant Name Explanation CDC_ERR_OK Normal process continuation CDC_ERR_CMDBUSY Command end flag is not 1 CDC_ERR_CMDNG CMOK flag is not 1 when command is issued CDC_ERR_TMOUT Time out wait for response wait for data transfer ready 2 Error Code
23. CD DA Logic Sector No LSN Continually adds numbers in sector frame units with the absolute time 00 02 00 on the CD as 0 Logic sector number frame address 150 2 seconds Used for information within the directory code ISO9660 File Information Directory record information maintained for accessing files There are the file lead FAD file size unit size gap size file number and attributes File Identifier Directly sequence number for identifying files Takes a value of 0 to directory record number 1 0 Own directory 1 Parent directory 24 List of Symbols and Codes Symbols and codes used are defined in Table 2 1 below Table 2 2 List of Symbols and Codes Adr address address BCD binary coded decimal binary decimal number bn bufno buffer no buffer partition number bufnum buffer numbers total number of buffer partitions Cl coding information coding information CN channel no channel number Ctrl control control dst destination copy and move destination fad frame address frame address fasnum fad sector numbers frame address sector numbers fid file identifier file identifier fln filtno filter no filter number file no file number LSB least significant bit least significant bit MSB most significant bit most significant bit ply play parameter play parameters pos position parameter position parameters SM submode submode sct sector sector ses session information session information sesno session no session nu
24. CD Drive Status Changes aera amp status ZSTANDBYs lt PAUSE gt lt OPEN gt lt PLAY gt lt SEEK gt lt PAUSE gt lt STANDBY gt lt 5CAN5 FEOPEN gt lt PAUSE gt lt OPEN gt lt PLAY gt lt SEEK gt lt PAUSE gt lt STANDBY gt lt SCANS FeNODISG gt lt OPENs lt OPEN gt lt OPENs lt OPENs _ lt OPENs lt OPEN gt lt OPEN5 FeERROR gt lt PAUSE gt lt OPEN gt lt PLAY gt lt SEEK gt lt PAUSEs lt STANDBY gt lt SCANS PeFATAL gt reetned urdained undened undeined undeined undefined undeine Uu n indicates no change 1 Commands issued in the lt BUSY gt status Commands issued in the lt BUSY gt status can be received but there is noguarantee of immediate execution For example While the tray is being opened or closed a command is not executed until that operation is over However the tray open command is executed immediately 2 Tray Open Close a As a rule the tray open command is executed immediately in any mode b The tray open close command when not using the automatic open close format is lt BUSY gt until executed manually c Commands in the lt OPEN gt status except for tray open change to each status after the tray close process d When the tray is closed lt NODISC gt occurs if TOC read cannot be done Even if there is a disc 3 Status Routings a Everything goes though the
25. Connectors 1 2 Connection from Buffer Partition to Filter Sector Data Copy Move The partition output connector is connected to the filter input connector and the flow of sector data allows sector data to be copied and moved The connection and flow I O process are executed by executing one command Because only the selected number of sectors flow loop does no continue indefinitely a Copy Move for different selector b Copy Move for self Figure 5 6 Copy Move Sector Data Selector Connections by OR Condition multi to one connection True output connectors of several filters can be connected to the same partition input connector This enables a sector to be stored in whichever of several conditions it coincides with OR condition logical add B AorB Figure 5 7 Selector Connection by OR Conditions System Library User s Guide 45 3 Types of Connectors and Connection Destination Table 5 1 Types of Connectors and Connection Destination Output Input Filter Input Partition Input Device Input O connectable 1 to 1 only 1 output connector can connect to 1 input connector A connectable multi to 1 several output connectors can connect to the same input connector OR condition X not connectable Whether to do a simple process of connecting disconnecting by one command or a complex process collecting connections and flow in out processes depends on each device The CD ROM and MPEG decoder a
26. DIO CDC_SM_DATA CDC_SM_TRIG CDC_SM_ FORM CDC_SM_RT CDC_SM_EOF System Library User s Guide 1 0 Same as CD ROM XA sub mode byte EOR End OF Record 1 Record end sector V Video 1 Video sector A Audio 1 Audio sector D Data 1 Data sector T Trigger 1 Trigger ON F Form 1 Form 2 0 Form 1 RT Real Time Sector 1 Real time sector EOF End Of File 1 File end sector 71 Title Data Data Name No Data Specification Sector Information CdcSct 6 7 1 Sector Information CdcSct sct CDC_SCT_FAD sct Sint_32 CDC_SCT_FN sct File Number CDC_SCT_CN sct Channel Number CDC_SCT_SM sct CDC_SCT_Cl sct Coding information Title Data Data Name No Data Specification File Information CdcFile 6 8 1 File Information CdcFile file CDC_FILE_FAD file File start frame address CDC_FILE_SIZE file File size byte number CDC_FILE_GAP file CDC_FILE_FN file CDC_FILE_UNIT file CDC_FILE_ATR file When there is no directory record system information the file number becomes 0 2 File Attributes bt 7 6 5 4 3 2 1 0 Lt 1 Yes directory 0 no directory note 1 Form 1 sector included not included 1 0 1 Form 2 sector included 0 not included Valid at CD ROM 1 Interleave sector included 0 non interleave XA 1 CD DA file 0 CD ROM file rai apie 1 Yes directory file 0 no directory file Ole Note 1 _ bit 1 is a directory bit of the file flag within the direc
27. Data Data Name No Data Specification Constants 2 0 1 Bit Names of interrupt factor register relationship HIRQREQ HIROMSK Constant Name DC_HIRG_CMOK CDC HIRQ DRDY GDG_HIRG_CSCT CDG_HIRG_BFUL CDG_HIRG_PEND GDG_HIRG_OGHG CDG_HIRG_ESEL CDG_HIRG_EHST CDG_HIRG_EGPY ODC_HIRO_EFIS 2 Special designation of buffer partition sector range sector location and sector number CDC_SPOS_END Indicates sector location of last partition Same as sector no in partition 1 designated CDC_SNUM_END Sector number from designated sector location SP to last partition Same as designated sector no in partition SP Effective with functions that correspond to the buffer partitions below CDC_CalActSiz CDC_ExeFadSearch CDC_GetSctInfo CDC_GetSctData CDC_DelSctData CDC_GetdelSctData CDC_CopySctData CDC_MoveSctData CDC_SNUM_END Filter a Buffer Partitions Stream gt gt aE ee A 2 a e e Designated Sector Location SP CDC_SPOS_END 3 Other Constant Name CDC_NUL_SEL Special value of selector no filter number buffer partition number CDC_NUL_FID Special value of file identifier System Library User s Guide 7 2 3 TOC and Session Information Title Data Data Name Data Specification TOC and Session Information 3 0 1 TOC Information lt 4 Bytes gt lt Track Location Information gt 0 Track 1 Information byte 0 1 2 3 i 1 Track 2 Information seta 2 a Saco Ei Ctrl Adr Track start fram
28. FAD that satisfies FADS designated FAD When there is no sector that satisfies this condi tion or when retrieval can not be done because of an error the sector position of the retrieval results is CDC_SOPS_END Connector that is already connected to the partition output is disconnected The retrieval result executes to get the frame address retrieval result Title Function Function Name S No Function Specs Get frame address search results CDC_GetFadSearch 6 7 Format Input Output Function value Function 94 CdcRet CDC_GetFadSearch Sint32 bufno Sint32 spos Sint32 fad none bufno buffer partition number spos sector position CDC_SPOS_END no applicable sector shown fad frame address Returns the return code Gets frame address search results initial values all 0 held by the CD block 8 2 7 Buffer Input Output Each buffer input output function get sector data delete write copy move in cludes the connector connection process In other words by issuing 1 command the device and selector connections and flow in and out complex processes are done Connectors connected to the partition output connector are disconnected Title Function Function Name SR No Function Set sector length CDC_SetSctLen 7 1 Specifications Format CdcRet CDC_SetSctLen Sint32 getslen Sint32 putslen Input getslen sector length when fetching putslen sector length when writing Output none Fun
29. Function Name S No Get sector information CDC_GetSctinfo 6 5 CdcRet CDC_GetSctInfo Sint32 bufno Sint32 spos CdcSct sct bufno buffer partition number spos sector position CDC_SPOS_END shows the partition s last sector sct sector information Returns the return code Gets header information FAD and subheader information of buffer partition designated sectors System Library User s Guide 93 Title Function Function Name SR No Function Specs Execute frame address search CDC_ExeFadSearch 6 6 Format Input Output Function value Function Remarks CdcRet CDC_ExeFadSearch Sint32 bufno Sint32 spos Sint32 fad bufno buffer partition number spos sector position CDC_SPOS_END shows the partition s last sector fad frame address none Returns the return code Starting at the designated sector position in the buffer partition with the frame address as the key the sector is retrieved and the result retained 1 Direction of retrieval Retrieves in the direction of the buffer partition from the smaller to larger sector position 2 Retrieval result Contents to be held as retrieval results include the buffer partition number retrieved sector position and the frame address of that sector 3 Retrieval conditions When a FAD that coincides does not exist the nearest sector not exceeding the designated FAD is used Therefore retrieval resultant FAD is the greatest
30. General Notice When using this document keep the following in mind 1 This document is confidential By accepting this document you acknowledge that you are bound by the terms set forth in the non disclosure and confidentiality agreement signed separately and in the possession of SEGA If you have not signed such a non disclosure agreement please contact SEGA immediately and return this document to SEGA This document may include technical inaccuracies or typographicalerrors Changes are periodi cally made to the information herein these changes will be incorporated in new versions of the document SEGA may make improvements and or changes in the product s and or the program s described in this document at any time No one is permitted to reproduce or duplicate in any form the whole or part of this document without SEGA S written permission Request for copies of this document and for technical information about SEGA products must be made to your authorized SEGA Technical Services representative No license is granted by implication or otherwise under any patents copyrights trademarks or other intellectual property rights of SEGA Enterprises Ltd SEGA of America Inc or any third party Software circuitry and other examples described herein are meant merely to indicate the character istics and performance of SEGA s products SEGA assumes no responsibility for any intellectual property claims or other problems that m
31. Position Parameters 2 2 CdcPos 6 4 Execptions to Frame Address The frame address is explained by the conditions below Start and Seek Positions End Position FAD lt disc start FAD disc start 150 FAD 150 FAD sector no 1 when starting FAD lt 150 FAD gt disc end FAD disc end 1 FAD disc end equal to read out Relationship of start and end positions End FAD Start FAD FAD sector number 1 The held contents of the play range are the Start FAD and End FAD Execptions to Track Index The track index is explained by the conditions below Condition Start and Seek End Position Positions TNO 0 track default TNO disc start track TNO disc last track value X 0 index default X 1 X 99 63H value TNO lt disc start track TNO disc start track TNO disc start track X 1 same as X 0 X 99 same as X 0 TNO gt disc end track TNO disc end track TNO disc end track X 1 same as X 0 X 99 same as X 0 X does not exist from the next track until track ends TNO track number X index number X 0 means designation of the track only track start last index TNO X 0 is the default value of the position parameter Start position start of disc End position end of disc Seek postion home postion 6 7 66 Exceptions to the Play Range The play range is retained if the end postion is smaller than the start position but the CD will not play For d
32. alized File information being held is destroyed if directory move and file information hold are stopped File access is also stopped when the tray is opened 8 2 9 Register Access Title Function Function Name No Function Specs Get data transfer register pointer CDC_GetDataPtr 9 1 Format Uinti6 CDC_GetDataPtr void Input none Output none Function value Register pointer Function Gets the data transfer register DATATRNS pointer Title Function Function Name No Function Specs Get interrupt factor register value CDC_GetHirqReq 9 2 Format Uint16 CDC_GetHirqReq void Input none Output none Function value Register value Function Gets the interrupt factor register HIRQREQ value Title Function Function Name No Function Specs Clear interrupt factor register CDC_ClrHirqReq 9 3 Format void CDC_ClrHirqReq Uint16 bitpat Input bitpat cleared bit pattern bit to clear is 0 other bits are 1 Output none Function value none Function Clears the interrupt factor by the designated bit pattern Only 0 is written Remarks Since the CD communication interface uses the interrupt factor register CMOK flag clearing by the application program is prohibited Title Function Function Name No Function Specs Get interrupt mask register value CDC_GetHirqMsk 9 4 Format Uint 16 CDC _GetHirqMsk void Input none Output none Function value register value Func
33. ameAddress By changing play end seek and the play range lt PAUSE gt occurs when FAD is outside the play range and the PEND flag of the interrupt factor register becomes 1 When FAD is outside the play range the lt PAUSE gt status cannot be canceled restart play Canceling lt PAUSE gt when FAD is within the play range changes the status to lt PLAY gt CD Play Repeat Process Both the repeat post frequency OH EH and maximum indication frequency OH FH are shown by 4 bits After the frame of the play end position is played FAD play end position 1 the following process is performed a Ifthe repeat frequency is less than maximum repeat frequency CD play will be repeated return to the start position and continue playing If the repeat frequency is lt EH 14 times gt at that time the repeat frequency is increased by 1 b Ifthe repeat frequency is greater than or equal to the maximum repeat frequency CD play will not repeat play end position 1 and pause System Library User s Guide 37 If the play range or maximum repeat frequency changes the repeat frequency clears to 0 Neither the repeat frequency nor play range rely on the tray open close or the seek operation while play is in progress Seek the Home Position Stop The following operations are done by seeking the home position a The disc motor rotation stops and pickup is moved to the standby position inside the circumference b The CD drive sta
34. and Periodic response absolutely returns CD report byte 0 1 2 3 4 5 6 7 Status Report Rep Ctrl CD Report Flg TNO X FAD Cnt Adr Combined status and CD reports are called CD status information 2 Status A status of FFH indicates REJECT abnormal command The status code is valid when WAIT bit 7 1 Other bits bit 4 to bit 6 are 0 bt 7 6 5 4 3 2 1 0 L j Status code CD drive status 00H lt BUSY gt Status currently changing lt PAUSE gt Currently paused 02H lt STANDBY gt Standby drive in suspended status 03H lt PLAY gt Playing CD 04H lt SEEK gt 05H 06H 07H 08H 09H OAH 1 Periodic Response 0 Command Responce 1 Data Transfer Request 0 Not the same 1 WAIT execute reserve 0 ACK command normal recieve System Library User s Guide 59 Title Data Data Name No Data Specification Status and Report 2 2 4 0 3 CD Report byte 1 2 3 4 5 6 7 Rep Ctrl CD Report Fig TNO X FAD Cnt Adr FLG 4 bit flag bt 7 6 5 4 1 CD ROM 0 CD DA or when seeking or scanning Rep Cnt 4 bit repeat frequency Notification range 0H EH 0 14 times Ctrl Adr CONTROL ADR byte of subcode Q TNO Track number of subcode Q binary value not BCD X Index number of subcode Q binary value not BCD FAD Frame address in header information when CD ROM otherwise based on subcode Q 4 CD Report content in every status CD Report is invalid for REJECT and valid for WAIT
35. artition Moves in between selectors System Library User s Guide 97 Title Function Function Name SR No Function Get sector data copy move error CDC_GetCopyErr 7 8 Specifications Format Input Output Function value Function 98 CdcRet CDC_GetCopyErr Sint32 cpyerr none cpyerr copy move error information Returns the return code Gets sector data copy move error information Copy Move Error Information Constant Name Description CDC_COPY_OK Normal end initial value CDC_COPY_NG Error is caused e Selector is disconnected during copy move e No more space in buffer CDC_COPY_BUSY Copy Move process is in progress aN 8 2 8 CD Block File System Title Function Function Name SR No Function Change directory CDC_ChgDir 8 1 Specifications Format CdcRet CDC_ChgDir Sint32 filtno Sint32 fid Input filtno filter number fid file identifier of the directory file CDC_NUL_FID root directory Output none Function value Returns the return code Function Moves the current directory to the directory shown by the designated file identifier Moves to the root directory if CDC_NUL_FID is specified in the file identifier When moved it reads directory record and retains a maximum of 254 files worth of data from the start 256 files if including parent and own Returns REJECT when directory is not designated by the file identifier Remarks The CD block file system uses the selector in the
36. ata Transfer Register Hardware Interface CD Block Program Host Communication Interface BIOS etc O w U O O A f communication with CD Drive In interfacing with the CD block the main system is called the host Moreover The CD block is one subsystem Figure 1 2 System Structure of CD Relationships 1 Communication with the CD Block The host and CD block communicate command response data transfer using registers on the hardware interface A command issued from the host to the CD block is called a CD block command however this is normally shortened to command 2 CD Drive The CD block periodically communicates with the CD drive controlling the CD drive with respect to commands from the host The CD drive accommodates the CD ROM XA standard and multi session Itis able to switch between the stan dard speed as well as double the standard speed Standard speed is automati cally set when playing CD DA Z 1 3 Functions and Characteristics Numbers 1 to 3 below are functions of the CD communication interface and 4 to 7 are CD block functions 1 CD Block Communication Functions a Communicates between the host and CD block and is the C Language interface function set b Issues commands to the CD block and receives the response c Corresponds one to one with the CD block command 2 Data Transfer Auxiliary Functions Supports auxiliary functions concerning data transfer suc
37. ay mode lt KEY gt fad frame address fasnum frame address sector number tno 1 start track number tno 2 end track number x1 start index number x2 end index number Note 1 fad fasnum 1 is retained as the end postion Note 2 Track and frame address designation cannot be combined even if there is no change on the one hand 4 Execptions to the Play Range No play if the end postion is less than the start position Becomes lt PAUSE gt status same as play range exterior The play range is held and the play mode is also effective Pickup moves to the start position System Library User s Guide 69 Title Data Data Name No Data Specification Sub header Conditions CdcSubh 6 6 Used when setting getting sub header conditions for a filter 1 Sub header Conditions dcSubh subh Access Macro CDC_SUBH_FN subh CDC_SUBH_CN subh CDC_SUBH_SMMSK CDC_SUBH_SMVAL subh subh CDC_SUBH_CIMSK subh CDC_SUBH_CIVAL subh e Mask pattern e Comparision Value Coding information comparison value Comparison object bit pattern Comparison value of the bit designated by the mask pattern Whether the submode and coding information is equal to the comparison value is decided after the logical product of their repective mask patterns are taken 70 Condition equation sm amp SMMSK SMV AL ci amp CIMSK CIVAL Ey 2 Sub Mode bt 7 6 5 4 3 2 Constant Name CDC_SM _EOR CDC_SM_ VIDEO CDC_SM_AU
38. ay result from applications based on the examples describe herein It is possible that this document may contain reference to or information about SEGA products development hardware software or services that are not provided in countries other than Japan Such references information must not be construed to mean that SEGA intends to provide such SEGA products or services in countries other than Japan Any reference of a SEGA licensed prod uct program in this document is not intended to state or simply that you can use only SEGA s licensed products programs Any functionally equivalent hardware software can be used instead SEGA will not be held responsible for any damage to the user that may result from accidents or any other reasons during operation of the user s equipment or programs according to this document NOTE A reader s comment correction form is provided with this document Please address comments to SEGA of America Inc Developer Technical Support att Evelyn Merritt 150 Shoreline Drive Redwood City CA 94065 SEGA may use or distribute whatever information you supply in any way it believes appropriate without incurring any obligation to you 6 27 95 002 SEGA SEGA OF AMERICA INC Consumer Products Division System Library User s Guide Doc ST 162 062094 CONTENTS System Program User s Manual SMPC I F User s Manual CD Communication Interface User s Manual 1994 SEGA All
39. aying 16 7 ms Update is not done during command response After response is read by com mand it is updated according to the next CD drive communication timing System Library User s Guide 31 3 4 Data Transfer Data Transfer Procedure When using commands to transfer data the host must do the data transfer process after the command response This procedure is listed below a The command needed for transferring data is executed data fetch write b Data transfer setup wait is executed Wait until the DRDY flag is 1 c Data is input and output through the data transfer register DATATRNS Get Data transfer register pointer is executed when getting the address d Data transfer end is executed when the necessary data is transferred Data Transfer End When there is a data transfer request by status end data transfer must be executed even when no data is actually transferred This is not necessary for REJECT and WAIT When an error occurs with the data transfer setup wait the application does not need to execute data transfer end Execution is automatically done within the setup wait function Data Transfer Errors Table 3 3 shows errors that occur while waiting for the setup of data transfer Table 3 3 Data Transfer Errors Data transfer time out CD block does not complete data transfer setup within the prescribed time DRDY flag remains at 0 and does not change to 1 Write sectors cannot be secured Empty sec
40. bh subheader conditions Output none Function value Returns the return code Function Sets subheader conditions for the filter Function Specs Get filter subheader conditions CDC_GetFiltSubh 5 4 Format CdcRet CDC_GetFiltSubh Sint32 filtno CdcSubh subh Input filtno filter number Output subh subheader conditions Function value Returns the return code Function Gets subheader conditions for the filter System Library User s Guide 87 Title Function Function Name SR No Function Specs Set filter mode CDC_SetFiltMode 5 5 Format CdcRet CDC_SetFiltMode Sint32 filtno Sint32 fmode Input filtno filter number fmode filter mode insignificant 8 bits are effective Output none Function value Returns the return code Function Sets the filter mode for the filter 1 Filter mode 2 3 88 bt 7 6 5 4 3 2 1 0 L Select file number FN not the same Select channel number CN not the same Select submode SM not the same Select coding information Cl not the same Reverse subheader conditions not the same reversal 1 Select frame address range 0 not the same 1 Initialize filter conditions return to intial values 0 not the same initialization O OoO OoO OoO Xoa Reverse Subheader Conditions If subheader conditions are reversed the output destination will be the opposite of what is normal for subheader conditions In short sectors that correspond to subheader cond
41. ction value Returns the return code Function Sets the length of one sector in the next cases e Gets sector data CD buffer to host e Writes sector data host to CD buffer Sector Length E constant Name 4 S50 SCENES SLEN_2048 2048 bytes user data initial value when fetched 2324 bytes if mode 2 form 2 CDC_SLEN_2336 2336 bytes up to subheader CDC_SLEN_2340 2340 bytes up to header CDC_SLEN_2352 2352 bytes entire sector 00C STEN NOCH Remarks The set sector length when fetching is also reflected in Calculation of actual data size System Library User s Guide 95 Title Function Function Name SR No Function Specs Get sector data CDC_GetSctData 7 2 Format Input Output Function value Function Remarks CdcRet CDC_GetSctData Sint32 bufno Sint32 spos Sint 32 snum bufno buffer partition number spos sector position CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition none Returns the return code Gets sector data from the designated sector range of the buffer partition After executing the function data must be transferred and fetched Title Function Function Name SR No Function Specs Delete sector data CDC_DelSctData 7 3 Format Input Output Function value Function Remarks CdcRet CDC_DelSctData Sint32 bufno Sint32 spos Sint 32 snum bufno bu
42. d flInout filter number of false output connector connection destination CDC_NUL_SEL not connected Function value Returns the return code Function Gets the filter connection destination When not connected returns 90 CDC_NUL_SEL Title Function Function Name SR No Function Specs Resert selector filter partition CDC_ResetSelector 5 9 Format CdcRet CDC_ResetSelector Sint32 rflag Sint32 bufno Input rflag reset flag insignificant 8 bits are effective bufno buffer partition number Output none Function value Returns the return code Function Initializes selector set conditions according to the reset flag value When reset flag 0 All specified buffer partition data is cleared When reset flag 0 Buffer partition number is ignored 1 Reset Flag bt 7 6 5 4 3 2 1 0 L e 4 Initializes data of all buffer partitions not the same initialization 1 0 1 Initializes all partition output connectors 0 not the same initialization Initializes all filter conditions not the same initialization Initializes all filter input connectors not the same initialization Initializes true output connector of all filters not the same initialization Initializes false output connector of all filters not the same initialization O OF O O 2 Initial Values The following initial values are set for all selectors by initialization e Buffer partition data All cleared a
43. e Get TOC information CDC_TgetToc These functions call the following functions internally e Data transfer waiting for start CDC_DataReady e Data transfer end CDC_DataEnd System Library User s Guide 73 8 1 List of Functions Table 8 1 is a list of functions of the CD communication interface Table 8 1 List of CD Communication Interface Functions 1 CD Block Common 1 0 1 CD play Get subcode G Get Subcode R W CD ROM Device Set filter connection point CDC_SetFiltCon Get filter connection point CDC_GetFiltCon Reset selector filter partition CDC_ResetSelector Get filter mode CDC_GetFiltMode 74 Table 8 1 List of CD Communication Interface Functions 2 Buffer Information Buffer Input Output Set sector length CD Block File System Change directory Register Access System Library User s Guide 75 8 2 Function Details 8 2 1 CD Block Common Title Function Function Name SR Function Get current CD status information CDC_GetCurStat Specifications Format CdcRet CDC_GetCurStat CdcStat stat Input None Output stat CD status information Function value Returns the return code Function Issues the get command of CD status information for the CD block and gets current CD status information status and CD report Title Function Function Name No Specifications Format CdcRet CDC_GetLastStat CdcStat stat Input None Output stat CD status information Function value Retur
44. e Specifications Format CdcRet CDC_Get Ses Sint32 sesno Uint32 ses Input sesno session number 0 99 Output ses session information 2 words Function value Returns the return code Function Gets session information 4 bytes of the designed session Waits in the lt OPEN gt status and lt NODISC gt status System Library User s Guide 77 Title Function Function Name SR No Function Initialize CDblock 1 2 CDC_Cdlnit 1 7 Specifications Format CdcRet CDC_CdInit Sint32 iflag Sint32 stnby Sint32 ecc Sint32 retry Input iflag initializing flag insignificant 8 bits are effective stnby standby time insignificant 8 bits are effective ecc ECC frequency insignificant 8 bits are effective retry retry frequency insignificant 8 bits are effective Output none Function value Returns the return code Function Initial setting of CD block 1 Initializing flag Designates each type of setting flag 8 bits to the CD block When software is reset all other initialized parameters are ignored and this becomes the initial value bt 7 6 5 4 3 2 1 0 Initial value OOH 1 Reset CD block software 0 notthe same 1 Decode of RW subcode 0 not the same 1 Doesn t confirm Mode 2 subheader 0 the same 1 Retry Form 2 read 0 not the same 1 CD ROM data read standard speed 0 2X standard speed 1 No change 0 Change a Interrupt factor register ESEL flag becomes 1 when reset o
45. e address Information of every track y Track n 1 Information 99 tracks n Track 99 Information Tracks not existing on TOC is FFFFFFFFH nA Track Information gt byte 0 2 Ctrl Adr First trac POINT A0 Value number PSEC PFRAME 98 99 First Track Information A0 100 Last Track infetmanon A1 m set tack POINT A1 Value 101 Read Out Information A2 ri ri humber PSEC IPFRAME A First Last track numbers are PMIN binary values 4 byte unit offsets lt Read Out Information gt 0 1 2 3 Read out start frame address Indicates final session value for multi sessions 2 Session Information Session Number lt Total p e H y lt 4 Bytes gt byte 0 Q Total Session Information Session External read out start ae 1 Session 1 Information Total No address Equal to TOC read out start FAD in single 2 Session 2 Information sessions lt Session Location Information gt n Session n Information 0 2 3 Start TNO within Session start frame address session TNO track no is a binary value Non existing sessions are FFFFFFFFH when session number exceeds session total Session 98 Information Session 99 Information 58 7 2 4 Status and Report Title Data Data Name No Data Specification Status and Report 1 2 4 0 1 Response Format Command response is in the format below Whether CD report returns as a report depends on the comm
46. e file information table is destroyed if file access stops System Library User s Guide 53 5 Multi Session In multi session cases the file system refers to the volume descriptor of the last session 54 7 0 DATA SPECIFICATIONS This chapter lists the constants data types access macros etc used by the CD com munication interface Format oy In the figures the reserved regions are shown by the mark A 0 must be specified in the reserve regions 7 1 Data List Table 7 1 is the CD communication interface data list Table 7 1 Data List pesca conse TOC morator amp Season wiomavon Ls fo cachet Status and Report Subcode information Data Types File information System Library User s Guide 55 7 2 Data Detailed 7 2 1 Basic Data Title Data Data Name No Data Specification Basic Data 1 0 1 Basic Data Types Description 1 byte integer without code 1 byte integer with code 2 byte integer without code 2 byte integer with code 4 byte integer without code 4 byte integer with code logical type 4 byte integer assumes logic constant as value 2 Logic Constants Used as a logic Bool value Constant Name Indicates that logic value is false Indicates that logic value is true aie Indicates switch is off false Indicates switch is on true 3 Additional Constant Name NULL void 0 NULL pointer WA 56 7 2 2 Constants Title
47. error conditions of retrieved subcode R W information pack data bt 7 6 5 4 3 2 1 a Pack data error 0 Normal i 0 Normal 1 Overrun error Remarks Pack data can not exceed retrieval of 16 packs in one time frame 13 3 ms Returns to WAIT if the pack buffer is empty and there is no pack data System Library User s Guide 85 8 2 4 CD ROM Device Title Function Function Name SR No Function Set connection destination of CD device CDC_CdSetCon 4 1 Specifications Format CdcRet CDC_CdSetCon Sint32 filtno Input filtno Connection destination filter number CDC_NUL_SEL display non connection Output none Function value Returns the return code Function Sets the connection destination filter of the CD device Connection is separated if CDC_NUL_SEL is selected Title Function Function Name S No Function Get connection destination of CD device CDC_CdGetCon 4 2 Specifications Format CdcRet CDC_CdGetCon Sint32 filtno Input none Output filtno Connection destination filter number CDC_NUL_SEL displays non connection Function value Returns the return code Function Gets the connection destination filter of the CD device Returns CDC_NUL_SEL if there is no connection Title Function Function Name S No Function Get buffer partition of last read sector CDC_CdGetLastBuf 4 3 Specifications Format CdcRet CDC_CdGetLastBuf Sint32 bufno Input none Output
48. esignating both frame address and track index Meanings of Special Designations e Specifies seek position default value used as a stop command seeks home position e Specifies seek position no change used as a pause command e Specifies play range no change used with pause cancel retry CD play Z 0 D Title Data Data Name No Data Specification CD Play Parameters CdcPly 6 5 Used to designate the play range and play mode when playing a CD 1 Play Mode When playing a CD the maximum repeat count of the play segment and the existence of pickup movement play position to the start position are designated The designation range of the maximum repeat count is 4 bits The default value is 0 bt 7 6 5 4 3 2 10 Maximum Repeat Count Explanation 00H No repeat plays only one time 01H OEH Repeat designation count repeat 1 14 times OFH Infinite repetitions 7FH Does not change maximum repeat count 1 Does not move pickup to start position 0 Same movement Constant Name Explanation CDC_PM_DFL Play mode default value no repeat moves pickup CDC_PM_REP_NOCHG No change in maximum repeat count CDC_PM_PIC_NOMOV Does not move pickup to start position lt PAUSE gt status when current position is outside play range CDC_PM_NOCHG Play mode does not change can change play range only Equal to CDC_PM_REP_NOCHG CDC_PM_PIC_NOMOV System Library User s Guide 67 2 Play Parameters CdcPly
49. f software ends b Recognition of the Mode 2 subheader is used only in the correcting process during CD ROM decode The selector always recognizes the subheader decides conditions of the filter selector length etc c Data is output even if there is an error when Form 2 read is not retried d CD ROM data read speed switches when changing to the lt PAUSE gt status When the CD DA area is played it automatically plays at standard speed The prior speed returns if the CD ROM area is entered 2 Standby Time Designates the transition time from lt PAUSE gt to lt STANDBY gt Changes to lt STANDBY gt when the standby time of lt PAUSE gt expires 0000H 180 seconds initial value 0001H FFFEH Transition time in seconds FFFFH No change in settings 78 Title Function Function Name SR No Function Initialize CD block 2 2 CDC_Cdlnit 1 7 Specifications 3 ECC Frequency Designates the number of repetitions of the ECC process PQ once each during CD ROM decode 00H ECC is processed a maximum of only 1 time in real time initial value 01H 05H When an error exists after the ECC process maximum number of repetitions total of 2 to 6 times 80H No ECC process a No change in settings 4 Retry Frequency Designates the number of retries of the same sector if an error occurs during CD ROM decode 00H Without retrying stops data output becomes lt ERROR gt initial value 01H OFH X Retrie
50. ffer partition number spos sector position CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition none Returns the return code Deletes sector data of the designated sector range of the buffer partition Sector positions after data is deleted advance in order Title Function Function Name SR No Function Specs Get and delete sector data CDC_GetdelSctData 7 4 Format Input Output Function value Function Remarks 96 CdcRet CDC_GetdelSctData Sint32 bufno Sint32 spos Sint 32 snum bufno buffer partition number spos sector position CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition none Returns the return code Gets data from the designaed sector range of the buffer partition Sector data of the designated sector range is deleted from the buffer partition After the function is executed data must be transferred and fetched Even if all data is transferred without being fetched all data of the designated sector range is deleted Title Function Function Name S No Function Specs Write sector data CDC_PutSctData 7 5 Format Input Output Function value Function Remarks CdcRet CDC_PutSctData Sint32 filtno Sint32 snum filtno filter number snum sector number none Returns the return code
51. filter connection destination CDC_SetFiltCon 5 7 Format CdcRet CDC_SetFiltCon Sint32 filtno Sint32 cflag Sint32 bufno Sint32 flnout Input filtno filter number cflag filter connection flag insignificant 8 bits are effective bufno buffer partition no of true output connector connection destination CDC_NUL_SEL disconnected flInout filter number of false output connector connection destination CDC_NUL_SEL disconnected Output none Function value Returns the return code Function Sets the connection destination below for the filter Connections are disconnected if CDC_NUL_SEL is specified e true output connector and buffer partition input connector e false output connector and other filter input connectors Filter Connection Flag bt 7 6 5 4 3 2 1 0 filter fin True output connector set flag 0 No change in connection conditions 1 Change the same connect disconnect to gt bh buffer partition true output connector False output connector set flag 0 No change in connection conditions b false output t aa roe 1 Change the same connect disconnect to filter L flnout Title Function Function Name S No Function Specs Get filter connection destination CDC_GetFiltCon 5 8 Format CdcRet CDC_GetFiltCon Sint32 filtno Sint32 bufno Sint32 flnout Input filtno filter number Output bufno buffer partition no of true output connector connection destination CDC_NUL_SEL not connecte
52. h as data transfer setup and termination as well as data transfer register address acquisition Data that is fetched and written in the CD block is sent through the CD block data transfer register The transfer itself is not through the CD communication interface but is through the DMA data transfer module Software transfer SH 2 DMA and SCU DMA can be done through the CPU 3 Register Access Function Supports functions that access the CD block register 4 CD Drive Function Playing music CD DA and sector read CD ROM are handled by a common command such as CD play Stop and pause CD play are seek commands Resume CD play cancel pause is executed by the CD play command 5 Subcode R W Decode Function Subcode R W is decoded when playing CD DA There is a pack buffer of 23 pack segments for storing decoded pack data 6 Stream Select Function CD ROM XA standard sectors and the stream of every type of device host MPEG etc are processed uniformly a There are 200 sectors about 460 Kbytes of CD buffer for storing streams b There are 24 independent selectors for selecting separating storing fetching streams 7 CD Block File System Function ISO9660 Directory information is held in the CD block so that files that conform to the 1SO9660 standard can be easily accessed System Library User s Guide 23 2 0 BASIC FACTS 2 1 Terminology and Symbols Definition of rms Terms used are defined in Table 2 1 below
53. ile information Function value Returns the return code Function Obtains file information 12 bytes of the indicated file identifier Obtains all file information up to 254 pieces held in the CD block if CDC_NUL_FID is designated in the file identifier Example CdcFile file Reserves information storage area of 1 file ret CDC_TgetFileInfo fid amp file CdcFile file 256 Reserves information storage area of all files ret CDC_TgetFileInfo CDC_NUL_FID file Title Function Function Name SR No Function Read file CDC_ReadFile 8 5 Specifications Format CdcRet CDC_ReadFile Sint32 filtno Sint32 fid Sint32 offset Input filtno filter number fid file identifier offset logical offset from first of file sector units Output none Function value Returns the return code Function Reads the designated file The read destination selector is designated by the filter number Title Function Function Name SR No Function Stop file access CDC_AbortFile 8 6 Specifications Format CdcRet CDC_AbortFile void Input none Output none Function value Returns the return code Function Stops file access by each function directory move file information hold and file read of the CD block file system Pauses the CD drive and the EFLS flag of the interrupt factor register becomes 1 Remarks Even if file access is stopped the buffer partition is not cleared and the selector is not initi
54. ion size Function value Returns the return code Function Gets current sector number buffer partition size of buffer partition 92 Title Function Specifications Format Input Output Function value Function Remarks Title Function Specifications Format Input Output Function value Function Title Function Specifications Format Input Output Function value Function Function Function Name SR No Calculation of actual data size CDC_CalActSiz 6 3 CdcRet CDC_CalActSiz Sint32 bufno Sint32 spos Sint32 snum bufno buffer partition number spos sector postion CDC_SPOS_END shows the partition s last sector snum sector number CDC_SNUM_END shows the sector number from spos to the last partition none Returns the return code Calculates the actual data size word number when fetched to host of the buffer partition designated sector range and holds that result Executes the setting of the sector length to set the length of 1 sector Connectors already connected to the partition output are disconnected Executes get actual data size to get the calculation result of the actual data size Function Function Name S No Get actual data size CDC_GetActSiz 6 4 CdcRet CDC_GetAct Siz Sint32 actwsiz none actwsiz actual data size word units Returns the return code Gets the actual data size initial value of 0 held by the CD block Function
55. is document have been archived The revised pages of the System Program User s Manual and the SMPC I F User s Manual can be found in ST 162 R1 092994 entitled SATURN System Library User s Guide ver 1 0 CD Communication Interface User s Manual 1 0 OVERVIEW This document is a collection of CD block functions and CD communication inter face external specifications Functions of CD blocks are classified in Table 1 1 below Table 1 1 Classification of CD Block Functions CD Part Communication format CD drive related CD buffer related CD block file system related MPEG Part MPEG Related CD block functions can be used by a common software interface through the CD communication interface 1 1 Library Configuration The library configuration of CD relationships is shown in Figure 1 1 Application Branch Animation Play Library MPEG Library Stream System File System MPG Library STM Library GFS CD Communication Interface CDC Software Hardware Figure 1 1 Library Structure of CD Relationships System Library User s Guide 21 1 2 System Configuration The system configuration of CD relationships is shown in Figure 1 2 Host Program File system Application etc Function Call Return CD Communication Interface DMA etc Data Transfer Module Communication with CD Block Command Response Fetch data Write data Command Input Output Register D
56. itions are output to false output connectors and sectors that do not correspond to subheader conditions are output to true output connectors conditions below e Output to true output connector filter FAD range coincides and subheader conditions do not coincide e Output to false output connector filter FAD range does not coincide or subheader conditions coincide Initialing Filter Conditions When filter conditions are initialized other bit selections are ignored and the initial values below are set e Frame address range Starting FAD 0 FAD sector number 0 Subheader conditions FN CN SMMSK SMVAL CIMSK CIVAL are all 0 e Filter mode All bits 0 Title Function Function Name S No Function Get filter mode CDC_GetFiltMode 5 6 Specifications Format CdcRet CDC_GetFiltMode Sint32 filtno Sint32 fmode Input filtno filter number Output fmode filter mode insignificant 8 bits are effective Function value Returns the return code Function Gets the filter mode for the filter Filter mode bt 7 6 5 4 3 2 1 0 L_ Select file number FN not the same Select channel number CN not the same Select submode SM not the same Select coding information Cl not the same 1 Reverse subheader conditions 0 not the same reversal 1 Select frame address range 0 not the same o O O Oo System Library User s Guide 89 Title Function Function Name SR No Function Specs Set
57. lears the host to 0 The CD block is only 1 Subcode R W begins the decode process when data fetch starts and if 8 packs have been collected Figure 4 4 Subcode Update and SCDQ Flagiffiing Subcode Get Tming The host issues the Get command by a timing with the SCDQ flag at 1 and gets subcode Q and R W data Polling is prevented by continuously issuing commands Getting Subcode Q The Get command can be executed any time regardless of the CD drive status But when in the lt OPEN gt status ineffective values may return depending on the CD drive status Getting Subcode R W Pack data reissues the Get command and gets data until the pack buffer is empty However exceeding 16 packs within the time of one frame 13 3 ms is not allowed WAIT is returned if the pack buffer is empty and pack data disappears System Library User s Guide 39 Subcode R W Decode a b c d Decode start and end Decode On Off are set by the initialize command of the CD block To start decoding set decode to ON then execute CD DA play Decode Start Timing Start decode during lt PLAY gt Data actually begins to be retrieved two frames before lt PLAY gt Pack Buffer Clear Timing Clear is done when decode begins The pack buffer content is saved even when doing seek and pause Decode Conditions Decode is done only when playing CD DA Decode is not done in other cases while scanning or playing the CD ROM area Subcode R W Erro
58. ll data within the CD buffer is cleared e Partition output connector Status All unconnected e Filter conditions Similar to initialization by set filter mode e Filter input connector Status All unconnected True output connector buffer partition and same number companion filters are connected e False output connector Status All unconnected System Library User s Guide 91 8 2 6 Buffer Information Title Function Function Name S No Function Get CD buffer size CDC_GetBufSiz 6 1 Specifications Format CdcRet CDC_GetBufSiz Sint32 totalsiz Sint32 bufnum Sint32 freesiz Input none Output totalsiz total buffer size sector units 200 sectors C8H bufnum total buffer partition number 24 partitions 18H freesiz empty buffer size sector units Function value Returns the return code Function Gets the Cd buffer total size and buffer partition number both are fixed values also the current space size The selector number or filter number is equal to the total buffer partiton number Remarks Even if the space size is 0 the buffer does not need to be full since there are sectors being used by the system Title Function Function Name S No Function Get buffer partiton sector number CDC_GetSctNum 6 2 Specifications Format CdcRet CDC_GetSctNum Sint32 bufno Sint32 snum Input bufno buffer partition number Output snum sector number within buffer partition buffer partit
59. mber snum sector numbers when specifying sector range of partition sp spos sector position when specifying sector range of partition src source copy move source stat CD status information CD status information subh subheader condition subheader condition for filter TNO track no track number music number toc TOC information TOC information txwnum transfer word numbers data transfer size in word units X idx index index number word word units 2 bytes 16 bits in length Numeric Notation B is added to the end of a binary number Ex 5 is 101B H is added to the end of a hexadecimal number Ex 255 is FFH A hexadecimal number in a C language program is noted by C language specifica tion Ox Handling BCD BCD should not be used in parameters Numbers recorded as BCD ona CD track number for instance are all converted to binary values C Language Identifier Use identifiers that begin with CD or Cd in the CD communication interface System Library User s Guide 25 2 2 Disk Layout Track Layout Figure 2 1 shows the relationship of the track configuration with the access key that indicates the position on the disk Information Area gt Q Code Lead ing Program Area gt Control TON Index Time Absolute Time ATime minute second frame Logic Sector LSN Frame Address FAD TOC Information FAD 0 Track start FAD Track start FAD Figure 2 1 Relationship of fack Configuration an cce
60. mode 2 file number form information 1 Directory code e Volume identifier Arranged from CD 00 02 16 FAD 166 A6H e Pass table A collection of pass table records Pass table size and address are recorded in the volume identifier e Pass table record Corresponds to one directory root sub Record position is the directory number 1 n Directory information is listed in the directory book Directory block A collection of directory records A directory block is considered to be one file directory file e Directory record Corresponds to one file includes directory Figure 6 1 File Management Data Configuration in CD ROM ISO9660 50 6 2 CD Block File System Functions The CD block file system referred to file system hereafter has the following functions 1 Moves directories and holds file information Moves to the specified directory and holds in the CD block file information within that directory 2 Gets file information Transfers held file information in response to a request from the host 3 Reads files Reads file sector data originating from held file information to the CD buffer The host is able to extract read sector data by data transfer 4 Stop Accessing Files CD play stops by moving a directory holding file information and reading a file If file access is stopped the CD block pauses the CD drive lt on the CD ROM gt Directory block for directory record Root di
61. nected through a selector A device output connector can only connect to a filter input connector and a device input connector can only connect to a partition output connector 42 5 3 Selector Configuration The selector process function does not rely on the parts connection destination or device It separates and stores the input stream and only outputs by request Figure 5 3 shows the selector configuration Buffer partition Filter input connector True output Partition input Partition output connector connector connector False output connector Figure 5 3 Selector Configuration Initial condition In the initial condition of the selector the filter and partition with the same number are connected through the true output connector and partition input connector Other connectors are not connected 5 3 1 Filter Conditions FAD range subheader of the sector that should pass are set in the filter Sectors that match with the conditions are output to the true output connector and stored in buffer partition of the connection destination All other sectors are output to false output connectors False output connectors can be connected to other filter input connectors and achieve in secession similar selection processes Sectors output from unconnected output connectors will be deleted Decide conditions Store Yes Stream gt Figure 5 4 Type of Stream Select Process System Library User s Guide 43 5 3 2
62. ns the return code Function Gets CD status information for the previous CD block command Remarks If the CD communication interface issues a CD block command the status and CD report of that response is held This function returns the value being held Title Function Function Name No Function Get periodic CD status information CDC_GetPeriStat 1 3 Specifications Format CdcRet CDC_GetPeriStat CdcStat stat Input None Output stat CD status information Function value Returns the return code Function Gets CD status information through periodic response Remarks Since the command for CD block is not issued the load is small and the polling process is possible 76 Title Function Function Name S No Function Get hardware information CDC_GetHwinfo 1 4 Specifications Format CdcRet CDC_GetHwInfo CdcHw hw Input None Output hw hardware information Function value Returns the return code Function Gets CD block hardware information Title Function Function Name Specifications Format CdcRet CDC_TgetToc Uint32 toc Input None Output toc TOC information 204 words Function value Returns the return code Function Gets all TOC information 102 peices 408 bytes Waits in the lt OPEN gt status and lt NODISC gt status Example Uint 32 toc 102 reserves TOC information store region ret CDC_TgetToc toc get TOC information Title Function Function Nam
63. ome 1 The timing is before the lt OPEN gt status Same for when opening manually Title Function Function Name Function Data transfer ready CDC_DataReady Specifications Format CdcRet CDC_DataReady Sint32 dtype Input dtype transfer ready type Output none Function value Returns the return code Function Waits until data transfer ready is enabled Data can be transfered after ready is finished If data is transfered data transfer end must be executed 1 Transfer Ready Type CDC_DRDY_GET Designated when getting data CD block host CDC_DRDY_PUT Designated when writing data host CD block 2 Transfer Ready Process Waits until DRDY of the interrupt factor register becomes 1 and clears 0 if it becomes 1 If empty sectors can not be reserved when writing the EHST flag of the interrupt factor register becomes 1 In this case CDC_ERR_PUT error is returned Remarks When an error is caused by ready there is no need to execute data transfer end It will be automatically executed inside the ready function 80 Title Function Function Name S Function Data transfer end CDC_DataEnd Specifications Format CdcRet CDC_DataEnd Sint32 cdwnum Input none Output cdwnum CD block transfer word number Function value Returns the return code Function Instructs the end of data transfer for the CD block Data transfer can be stopped while in process 1 CD Block Transfer Word Number Returns the
64. ply CDC_PLY_ETYPE ply End position type CDC_PLY_EFAS ply Sint 32 End position frame address sector number a CDC_PLY_ETNO ply End position track number CDC_PLY_EIDX ply End position index number CDC_PLY_PMODE ply Uint 8 Play mode repeat designation pickup movement 68 VA 3 Method for setting play parameters Play parameters designate the play range and play mode Play range is designated by a combination of the position parameters of the start and end positions a Track designation and frame address designation cannot be combined in the play range In such cases REJECT is returned All other play range combi nations are possible b All play range and play mode combinations are possible c The play range and maximum repeat count is held within the CD block and are effective until reset d Default value start of disc to end of disc no repeat moves pickup Examples of settings are shown below ces Play Method Start Position End Position e E N designation Play from first of disc CDC_PTYPE_DFL tno 2 x2 eet Maia ie heel End position does not tno 1 x1 CDC_PTYPE_NOCHG note i change only the start position changes Start position does not CDC_PTYPE_NOCHG tno 2 x2 note 2 change only the end f position changes aun Play is retried from the CDC_PTYPE_NOCHG CDC_PTYPE_NOCHG CDC_PM NOC current position without HG is changing the play range designated in and play mode the Pl
65. r a b 40 Over Run Error If a pack is not fetched in time the pack buffer is overwritten and an over run error occurs After data transfer has ended the get pointer advances to the extent that the pack is without an overrun error The host must finish transfer ring data within the decode time of 1 pack 3 2 ms Pack Data Error Pack data checks CRC and corrects the data if an error is detected A pack data error occurs if the data cannot be corrected 5 0 CD BLOCK CONFIGURATION The characteristics and logical configuration of the CD block as seen from the host is shown below Data Format The basic unit of the stream handled by the CD buffer is a fixed size 2352 bytes sector no matter what the device is Stream Select Circuit The functions that separate and store streams are attained by a filter and buffer partition design These functions are considered to be logical elements selector The circuit that selects the necessary streams is constructed by combining selectors Device The CD and MPEG are considered to be logical devices that produce and absorb streams The flow of a stream is controlled by connecting a device to the stream select circuit 5 1 Data Flow Figure 5 1 shows the entire data flow for a CD block CD ROM MPEG Buffer MPEG Decoder ep Ply Read Write Decode CD Read Write Display i VDP2 CD Buffer Read RGB 88 Copy Move K Buffer lt MPEG Frame Partition jJ gt Write
66. re single processes Others host copy move etc are complex processes 46 5 3 4 Selector Precautions 1 2 3 4 5 Error in the Stream Process Except with the CD device error in the stream process occurs in the following cases e Connection separates during operation e CD buffer becomes full while reading or writing to the buffer partition Selector Set Effective Timing FAD with selector settings made effective while a CD is playing is within one FAD from response of the selector set command The host considers the margin and issues the set command before 10 or more sectors of the target FAD When the selector setting has ended the ESEL flag of theinterrupt factor register becomes 1 Sector Data when Changing Connections When the CD is being read data is not omitted even if the connection changes during the sector data sequence In short the flow of data is guaranteed when temporarily interrupted while switching connections General Access to the Buffer Partition general command specifying sector position and sector range Returns to WAIT when the specified sector range doesn t exist like the data number within the partition is exceeded Always returns to WAIT when the data number within the partition is 0 Clear Discharge from Buffer Partition When a sector is cleared and discharged from a partition all data of the selected sector range is cleared get and clear or move sector data even if the
67. rectory Parent Self Move directory Hold file information in directory move destination File information of the current directory self i Holds file ile i Held identifier of first file i information 1 i Held file information number n s Wee i Te File identifier fid Directory record sequence number File j Readingfle gt Buffer partition Figure 6 2 CD Block File System Configuration System Library User s Guide 51 6 2 1 File Information Holder Method The CD block provides 256 file information tables that hold file information for accessing The first two parts in this table always holds current directory self and parent directory information Up to 254 parts of ordinary file information can be held The number cannot be designated 1 Directory Move If a directory is moved the directory record is read and file information is extracted and held ina table The range that is held is from the start of the directory block 2 Holding File Information specifying the hold range Specifies a file identifier and can hold file information from any position within the current directory In this case also self and parent information is held in the first two parts of the table 6 2 2 File Access Procedure 1 Moving to the Root Directory In using the file system first move to the root directory and create a file informa tion table This is the same when file information is cleared when starting up
68. s designated number of times data output stops if there is an error becomes lt ERROR gt et Data is output without retrying 41H 4FH Retries designated number of times data is output even if there is an error 80H Infinite number of retries No change in settings bt 7 6 5 4 3 2 1 0 X Frequency indicated by insignificant 4 bits Frequency 0 15 times 1 Data output even if error occurs 0 Stops output 1 Infinite number of retrys 0 Definte number 5 Tray Open Close Closes the Tray when in the lt OPEN gt status e When automatic format front loading CD block automatically closes tray When manual format top loading lt BUSY gt status until closed by manual Tray open when in the lt NODISC gt status See Tray Open Tray open and close operates the same for CD play seek play position and scan Remarks All command issues are prohibited while the software is being reset System Library User s Guide 79 Title Function Function Name SR No Function Open tray CDC_CdOpen 1 8 Specifications Format CdcRet CDC_CdOpen void Input none Output none Function value Returns the return code Function Stops the CD drive and opens the tray e When automatic format front loading CD block automatically Opens tray e When manual format top loading lt BUSY gt status until opened by manual Remarks When the tray is opened DCHG of the interrupt factor register and EFLS flag bec
69. s reset and information is in a non input condition The host explicitly commands the reading of file information Host Information Initialized if software is reset unrelated to opening the tray Host Information mostly host set information and buffer data e Initialization information CD block initialization parameters e Play information play range maximum number of repeats current repeat notification number e Selector information filter buffer partition etc host setting for selector e Data within buffer buffer partition size space size e Actual data size retained setting of sector length e Data transfer control register initializing ends transfer of data e MPEG related information If the CD block is initialized without resetting the software information in the TOC Session and Host is not initialized System Library User s Guide 49 6 0 CD BLOCK FILE SYSTEM 6 1 File Management in CD ROM ISO9660 The CD block file system supports a logic format that conforms to ISO9660 Directory block Directory file Volume Identifier Pass table Cc Root director y Sub directory Al Pass table size 2 Pass table address e Root directory code of Root directory Pass table cose Sub directory n Directory ras Directory block address Parent directory number Directory name File lead sector address e File size File name e System information for
70. ss Key Multi Session Layout TNO Absolute Time ATime Header minute second frame Logic Sector Number LSN a Frame Address FAD a A TOC Information Track start FAD Track start FAD fi Track start FAD Session Information Session start FAD Session start FAD Session start FAD Index is 00 Figure 2 2 Multi Session Layout Y 26 3 0 COMMUNICATION WITH THE CD BLOCK 3 1 Communication Register Table 3 1 shows the CD block and communication registers and corresponding access functions Table 3 1 Communication Registers Data Transfer Register CDC_GetDataPtr Register Name DATATRNS HIRQMSK Interrupt Mask Register CDC_GetHirqMsk CDC_SetHirqMsk MPEGRGB MPEG Register RGB data CDC_GetMpegPtr HIRQREQ CDC_GetHirqReq CDC_ClrHirqReq LAREI All access widths are 16 bits 1 word See below for more information about the communication register In the figure a reserve bit is shown by The reserve bit must be specified with a 0 The bit configuration is 15 for the most significant bit and 0 for the least signifi cant bit Data Transfer Register DATATRNS When transferring data this register inputs and outputs data between the host and CD block The inner part of the register is FIFO Register Name 15 14 13 12 11 10 9 8 ee ee ae System Library User s Guide 27 Interrupt Factor Register HIRQREQ This is the interrupt factor register from the CD block to the host Regis
71. st Register Name 15 7 6 5 4 3 2 1 0 EHST ESEL DCHG PEND BFUL CSCT DRDY CMOK a Bit content is the same as the HIROREQ register 1 interrupt enable 0 same mask b This occurs if interrupt is masked corresponding bit 0 when interrupt occurs e not reflected in IRQ output e reflected in the HIRQREQ register Polling process possible 28 MPEG Register MPEGRGB This register is for transferring in the RGB format MPEG frame buffer image data that is in the RGB format to the host Register Name 15 mars La D p p E e E e X bit 0 bit 15 RGB data See MPEG part for the meaning of each bit 3 2 Communication Method Communication Time All interrupts are prohibited during the response time of command response Re sponse time may be delayed when commands are continuously issued Communication Error A communication time out error occurs when the CD block does not respond com mand is not returned within the prescribed time after a command is issued Command Issue Provisions Command issue must obey the following provisions a A maximum of 30 commands can be issued within 6 7 ms b A maximum of 60 commands can be issued within 16 7 ms c When acquiring a subcode a maximum of 34 commands can be issued within 13 3 ms subcode R W is 16 commands subcode Q is 1 command d Commands belonging to the same command end flag wait for execution to end and are issued lt Program Guide gt
72. ter Name 15 woo ow e eer 7 6 5 4 3 2 1 0 EHST ESEL DCHG PEND BFUL CSCT DRDY CMOK CMOK bit 0 Issueable command 1 command can be issued response set complete DRDY bit 1 Data transfer ready 1 data transfer setup is complete CSCT bit 2 1 sector stored 1 1 CD ROM sector is stored or discarded in partition BFUL bit 3 CD buffer full 1 CD buffer is full PEND bit 4 CD play end 1 CD play has ended current FAD is outside play range DCHG bit 5 Disk exchange 1 Disk has been exchanged tray has been opened ESEL bit 6 Selector set end 1 soft reset stop execution of selector set EHST bit 7 HostI Oend 1 stop execution of host input output ECPY bit 8 Copy end 1 stop execution of copy and move between buffer partition EFLS bit9 File system end 1 stop execution of CD block file system SCDQ bit10 Subcode Q 1 subcode Q renewal complete CD drive communication timing Xx bit 11 bit13 MPEG related interrupt factor see MPEG part for the meaning of each bit a Bit write can only be done at 0 clear not at 1 b The IRQ output to the host is OR output of all factors Clears corresponding factor bits during interrupt process c Names the command end flag of each bit ESEL EHST ECPY EFLS Reports the end of execution of commands belonging to each flag Interrupt Mask Register HIRQMSK This register is for masking interrupt from the CD block to the ho
73. tion Gets the interrupt mask register HIRQMSK value Title Function Function Name No Function Set interrupt mask register CDC_SetHirqMsk 9 5 Specifications Format void CDC_SetHirqMsk Uint 16 bitpat Input bitpat mask bit pattern bit to mask is 0 other bits are 1 Output none Function value none Function Masks interrupt factor by designated bit pattern Title Function Function Name No Function Get MPEG register pointer CDC_GetMpegPtr 9 6 Specifications Format Uint 16 CDC_GetMpegPtr void Input none Output none Function value register pointer Function Gets MPEG register MPEGRGB pointer
74. tors could not be reserved by writing sector data With the DRDY flag at 0 the EHST flag is 1 32 4 0 CD DRIVE 4 1 CD Drive Status Change CD Drive Status Table 4 1 CD Drive Status Status Explanation O O Seeking Types of Drive Commands Table 4 2 shows the types of commands drive commands that change the CD drive status lt SCAN gt Table 4 2 Types of Drive Commands CDC_CdSeek CDC_CdSean a When doing a soft reset CD block initialization does not operate as a drive command b Drive commands other than tray open can be done concurrently with the tray close command Issuing Drive Commands a Drive command response must return the lt BUSY gt status as long as there is no REJECT b As a rule command issued afterwards are issued by priority System Library User s Guide 33 4 1 1 Illustrations of CD Drive Status Change 1 Status Change Illustration of a Normal System Figure 4 1 illustrates the status change of a CD drive in a normal system Tray Close Command e Manual Close Hard Reset Tray Open Command Manual Open Opened All Drive Command e CD Block Initialize Command Yes Stop Command e Pause Command TOC Read lt gt CEQ Scan command Seek Command Figure 4 1 Illustration of CD Drive Status Change Normal System a lt PAUSE gt occurs two seconds after TOC read at frame 0 FAD 150 96H b The lt BUSY gt status indicates that a status change is
75. tory record and valid when there is no system information discriminant gives bit 7 priority Note 2 _ bits 3 to 7 is attribute information conforming to CD ROM XA standards and bits 3 to 7 are 0 when there is no system information 72 8 0 Function Specifications Function specifications of the CD Communication Interface are described 1 Format Reserved areas with the figure are indicated by a must be designated with a 0 U n mark Reserved areas 2 Initial Values of Parameters Initial values of parameters held in the CD block are equal to the default values designated by the host as long as they are not specially specified 3 CD Status Information Status and CD Report Hold The CD communication interface holds status and CD reports when a CD block command is issued Information is not held by a periodic response The intial value of all holding contents is 0 The functions that change the holding status CD report are listed below by symbol SR changes status and CD report S changes status only no changes no command issued Title Data Function Name SR No Function Specification CD Play CDC_CdPlay 2 1 Nothing changes when there is an error When the error code is not CDC_ERR_OK 4 Data Transfer Inside Functions Among the information get functions data transfered by the function interior enters the function name as Tget The method of data transfer is software transfer by the CPU Exampl
76. tus changes to lt STANDBY gt and report is an invalid value FFH line c When the status changes from lt STANDBY gt in the home position to lt PAUSE gt seek moves to the start of the disc d The play range maximum repeat frequency and repeat notification frequency which have been saved cannot be changed Pickup Position in the lt SYNDBY gt status e Moving from the lt PAUSE gt status Current position report also remains unchanged e When seeking the home position Standby position inside the circumference report is an invalid value CD Read in a Full CD Buffer If the CD buffer becomes full a lt PAUSE gt will occur and the BFUL flag of the inter rupt factor register becomes 1 When there is space in the CD buffer play automati cally starts where it left off 38 4 3 Subcodes Subcode Update and SCDQ Flag The subcode Q is updated for each frame one sector The SCDQ flag becomes one every time subcode Q is updated same as update timing of periodic response Subcode R W can update four packs one packet with one frame and be stored in the pack buffer There is a 23 pack short of six packets segment in the CD block lt Standard Speed when playing CD DA gt 13 3 m lt lt L L 4 SCDQ Flag _ aes Pack Data Aquisition Krz gt lt 4567 DKE ABC E P lt 507 gt C29 ABDC cE P gt Subcode R W a Pack Data Update Smee llli IIl Subcode R W Decode Completion 0 1234 5678 The SCDQ flag c
77. ult value frame address track index and no change can be designated at position parameters The constants position type below are used to select the parameter Constant Name Explanation CDC_PTYPE_DFL Designates default values For CD play indicates disk start and end For seek indicates home position CDC_PTYPE_FAD Designates frame address CDC_PTYPE_TNO Designates track index CDC_PTYPE_NOCHG Designates no change no change in set values Beginning of disc FAD 150 96H position 2 seconds 0 frame with absolute time End of disc FAD readout start frame address TOC information 1 position 2 Position Paramters CdcPos pos CDC_POS_PTYPE pos Sint 32 CDC_POS_FAD pos Frame address FAD sector no CDC_POS_TNO pos CDC_POS _IDX pos Index number 3 Setting Method a Designating the default value CdcPos pos CDC_POS_PTYPE amp pos b Designating the frame address CDC_POS_PTYPE amp pos CDC_PTYPE_FAD CDC_POS_FAD amp pos fad frame address The end position is designated by sector number FAD sector number from the starting FAD c Designating the Track Index CDC_POS_PTYPE amp pos CDC_POS_TNO amp pos CDC_POS_IDX amp pos d Designating No Change CDC_POS_PTYPE amp pos CDC_PTYPE_DFL CDC_PTYPE_TNO tno track number x index number CDC_PTYPE_NOCHG System Library User s Guide 65 4 5 Title Data Data Name No Data Specification CD
78. write Could not reserve empty sectors 3 Status The retaining status of the CD communication interface is substituted in the return code status together with all functions Response status returnswhen response is acquired by acquiring periodic response or issuing commands The holding status returns unchanged when a response cannot be acquired by not issuing a command or error System Library User s Guide 63 Title Data Data Name No Data Specification CD Status Information CdcStat 6 2 Combine the CD block status and CD report to create CD status information 1 CD Status Information CdcStat stat CDC_STAT_FLGREP stat 2 CD Report CD flag and Repeat Count bt 7 6 5 4 3 2 1 0 L a Repeat number OH EH repeat 14 times 1 CD ROM 0 CD DA or when seeking or scanning Title Data Data Name No Data Specification Hardware Information CdcHw 6 3 1 Hardware Information CdcHw hw CDC_HW_HFLAG hw Hardware flag CDC_HW_VER hw CD block version information CDC_HW_MPVER hw MPEG version information CDC_HW_DRV hw CD drive information CDC_HW_REV hw CD block revision information 2 Hardware Flag MPEG exists 0 not the same 1 Hardware error occurs 0 Normal 64 Title Data Data Name No Data Specification CD Position Parameters 1 2 CdcPos 6 4 Designates the CD range of play start and end positions and is used in designating the seek position 1 Position Type Defa

System Library User`s Manual

Contents

Download Pdf Manuals

Related Search

Related Contents