EZ-USB-168 User manual
Contents
1. Help DESS BO similaj eB Figure 3 19 Help Menu About Function On line help Description Provide assistance on how to operate the tool Operation Click the Help command and the Help directory will display Function Shows the current version and corresponding copyright of the Operation Click the command and the dialog box shown in Figure 3 20 below will display Ean EUSBinepector EUS Binspector Version 1 0 Copyright i 2001 Contract fons linen com ty Figure 3 20 About the EUSBInspector 24 Appendix 1 Detail Description of the Report Packets amp Frame Bus Traffic Summary Setup numbers of me setup packets with different Address and endpoint The numbers of the IN TOKEN with different address and endpoint Qut The numbers of the OUT TOKEN with different address and endpoint The summation of the Setup In and Out token Control Transfer Assigned EET Direction The direction of the Control Transfer D Device H Host 1 D gt H Device to Host 2 H gt D Host to Device etc Refer to the USB2 0 Specification Page248 The type of Control Transfer recipient e g Device Interface Endpoint etc Refer to USB2 0 Specification Page 248 2 Standard Device Requests bRequest Description CLEAR_FEATURE This request is used to clear or disable a specific feature GET_CONFIGURATION This request returns the current device configuration value GET_DESCR2. program double click the ICON on the desktop or execute the program EUSBinspector exe under Windows The following window Figure 3 1 will then display Er Elan USB Inspector EUS Bluspectorl ga Fie Capture View Tool Setup Windows Help A x De S E Sima e E ed ENE TE SEKE Pl PII FT TIMI yu Figure 3 1 EUSBinspector Main Window 14 If error occurs the error message shown below will display Please double check all connectors to and from the EZ USB 168 for proper connections MECO cc nee EE si ie i peo e emi lil a There are six items File View Capture Tool Setup and Help in the Menu Bar of the main window Figure 3 1 Each item contains pull down menus providing easy to locate commands for quick execution The following section will give you a brief summary of the commands within each Menu Bar item 3 2 1 File Menu File Management The commands from the File Menu include New Open Save As Print Print Preview Print Setup and Exit Figure 3 3 I Elan USB Inspector E SBInspector fm File Capture View Tool Setup New Open Coho mate As tes Frinti F Ctrl F Print Preview Print Setup Exzit Figure 3 3 File Menu Each of the commands are explained below Function It is used for opening the captured files stored in the disk The default extension of the file name is usb Details The EZ USB 168
3. the hardware installation check by following steps l 2 When inspector is connected to PC check its red LED POWER If it is dark the inspector is not rightly powered Check the yellow LED ERROR If it is lighted the inspector hardware can not be normally initialized Press reset button If it is still lighted the inspector has some problems in it Contact Elan for support The green LED CONFIG should be lighted when inspector is normally initialized If it is dark the FPGA on the inspector has problem Contact Elan for support If the red LED POWER and green LED CONFIG are lighted and yellow LED ERROR is dark the inspector system Is already normally initialized When the Windows can not recognize the inspector you may pull it out from the cable and plug it again to let the USB host controller to do enumeration again If it still can not be recognized by Windows contact Elan for support 2 3 Software s requirement The application EUSBInspector of the EZ USB 168 is designed to operate under Windows OS You must have one of Windows 98 Windows Me Windows NT Windows 2000 or Windows XP in your computer to run it 2 4 Software s Installation Please take out the bundled CD from the package and then insert it into the CD ROM drive of your computer Follow the step by step procedure listed below to install the driver program step 1 Execute the EUSBInspectorVer1 0 exe program from the CD Then InstallShield w
4. 3 14 USB Bus Report Dialog Box The statistics report shown on the dialog box is compiled from the last data stored in the PC s memory regardless of whether they were uploaded from the tool or opened from disk files The contents in the report are arranged in a columnar format for easy reading More details are provided in Appendix l 3 Click SAVE button to save the reportas a file in general ASCII format You may later use any text editor e g MS Word Notepad to read or edit it Click OK button to quit the function Function To search the data by the different method Details For convenient search for data the EUSBInspector allows you to search five types of information i e PID Data Packet Address and End point through the recorded data Furthermore you can search from top to bottom of the data or vise versa to quickly find the match you wanted The five types of search information are as follows _Info Type Format Remarks Search for Setup packet Search for IN Token packet Search for OUT Token packet Search Data packet Search STALL packet Search ERROR packet DATA Hexadecimal Search for specific number in DATA field Packet Hexadecimal Search for specific PACKET 21 ADDR Hexadecimal Search for specific ADDRESS ENDP Hexadecimal Search for specific End Point Operation 1 Click the Search command and the Search dialog box will appear as shown below search Dialog
5. AN ICE Search Microsoft Visual C 6 0 Settings I ral ra NETA BEA Microsoft visual SourceSafe Help En ELISBinspector F Er EUSBinspector Run Shut Dow Windows 2000 Professional A Removable Disk E InstallShield wWfizard 4 P 12 Chapter 3 Getting Started with the Inspector Please be sure that the procedure in Chapter 2 Installation has been satisfactorily completed before continuing In order to get a full understanding of how the tool function and process USB Signals the following topics are further provided 3 1 Introduction The key function of our EZ USB 168 USB Inspector is to capture the USB Signals in the USB cable and extract the high level protocol from them The EZ USB 168 captures the USB electric signal when the Device Under Test is communicating with the host PC After proper decoding of the low level USB Signal the packet data are sent to the host PC The application EUSBinspector in the host PC transforms the packet data into readable format and displayed on screen for you to trace analyze and debug during development of your USB devices It is recommended that you must be familiar with the USB 1 1 specification before using the EZ USB 168 USB Inspector so as to get into the bottom of the tools 3 2 Starting with EUSBinspector Make sure that the EZ USB 168 USB Inspector and the PC are properly connected before you start the driver program To start the
6. ATAD DATA DATAO DATAN DATAT Setup Status Stage stage No data SETUP 0 IN 1 Control DAT AO DATA Figure A3 7 Control Read Write Sequence Figure A3 8 shows a Isochronous Transaction Format In the isochronous in transaction the host sends an in token packet to the device After receiving the in token packet the device responses with data packet In the isochronous out transaction the host sends an out token packet to the device firstly and then data packet In the isochronous transfer handshake packet is not required Idle DATAO Idle eae Host Function Figure A3 8 Isochronous Transaction Format Figure A3 9 shows Bulk Transaction Format In the bulk in transaction the host sends an in token packet to the device to request data The device has 3 response ways 1 responses with data packet if it is ready to send to the host 2 responses with NAK handshake packet if it is not ready to send to the host 3 responses with STALL handshake packet to indicate that endpoint has some problems In first situation the host will send an ACK handshake packet to the device after receiving the data packet correctly If the data packet host received encounters error the host does nothing In the bulk out transaction the host sends an out token packet to the device followed by a data packet The device has 4 response ways 1 responses with ACK handshake 28 packet if it receives data correctly 2 responses with NAK handsh
7. Box Display Function To set the display color of the various fields in the driver program Setting U IN Record Setting Details It is more convenient to distinguish and identify the different names of USB signals when each of them is painted with your favorite color Operation Click the Display Setting command and the dialog box illustrated below Figure 3 18 will display TokengFrame USB PID Figure 3 18 Display Setting Dialog Box Point and click at the field which color you want to change Then select one of the colors from the resulting color palette The newly selected color will show on the field Click the Save As Default button and the newly selected colors are saved 23 into your hard disk When you run the driver program next time the last selected and saved colors will be restored from your hard disk It will continue to reload those colors until they are changed again 3 If you intend to use the newly selected colors for current session only click the OK button Color change is temporary and is not saved in the hard disk 4 Refer to the Appendix 3 further details of each field peset Function Reset the machinej 3 2 6 Help Menu On Line help It consisted of Help and About for the EUSBInspector Figure 3 19 E Elan USB Inspector EUSBInspectorl fem File Capture View Tool Setup Windows
8. IPTOR This request returns the specified descriptor if the descriptor exists GET_INTERFACE This request returns the selected alternate setting for the specified interface GET_STATUS This request returns status for the specified recipient SET_ADDRESS This request sets the device address for all future device accesses SET_CONFIGURATION This request sets the device configuration SET_DESCRIPTOR This request is optional and may be used to update existing descriptors or new descriptors may be added SET_FEATURE This request is used to set or enable a specific feature SET_INTERFACE This request allows the host to select an alternate setting for the specified interface SYNCH_FRAME This request is used to set and then report an endpoint s synchronization frame 25 3 Protocol Layer of USB Specification Packet All the USB data transfers are implemented by the element packet A packet 1s a bundle of field organized in a group for transmission For USB host and device receiving packet correctly there is a field called SYNC at the beginning of every packet It is used by the input circuitry to align incoming data with local clock There is also a field EOP used to mark the End of Packet Figure A3 1 The sync field and EOP in the packet In the USB data transfer there are 4 types of packets token data handshake special in the USB 1 1 specification as shown in the table A3 1 CECI IM GN I Addres
9. ON a A E E E A A A D TT MBoEoEJ EOO j 5 lak The SB SpECINCAION ss or e re a i ee alea onk 6 Chapter 2 Instala ina 7 2 1 Hardware TEQUIEMEON sss nerek rk kol E A 7 22 MATO ave MS AWW AN Oz a a A da 7 Zed SORLW ales TEGQMIFEMO ME am oo 11 ZO Wars AS Cea NON asa o E I esate 11 Chapter 3 Getting Started with the InsSpector ooocccccccccnononocnnnnnnnnnnonnnnccnnnnnnnnnnnnnos 13 o A o O Uu 13 3 2 Statins with EUS DIAISpDEC OF 3a maa a aD kal kak bu aa 13 3 2 1 Ple Tile Manas CMe Mls amara a a di ar a krad 15 3 2 2 View the view management essseseeeeeeeeneennnnnnneeeeee 19 5 2 3 Capture ReECOrdmo TUNCHON suu o ER A 18 De deo OO WOOK aye terest dada ende 19 3 2 5 Setup Basic setup TUNCHOM sz KK 22 320 Help One MeO sn lee 24 PRD o OI oidos 29 AAPP ue o AN ON ER mn o E denen Nao 2 ZAPPA VO asa ena kb e e ee e ens se 25 SND PONOIX TALC asas 26 Chapter 1 The USB Inspector 1 1 introduction The EZ USB 168 which is also called as USB Inspector is a debugging tool used for intercepting on line USB signal of any USB 1 1 compliant device by inserting it between the host and USB device through two USB cables The tool can extract the USB protocol without interrupting the operation that is when the USB device is operating with the host PC After properly decoding the filtered out USB signal from the USB cables the EZ USB 168 Inspector transfers the signal to the s
10. Search by PID Setup FindNext C Search by Data l C Search by Packet Direction A C Search by ADDR E Down C Search by ENDP Figure 3 15 Search Dialog Box Click the option button of the desired type of search information Then click the direction Up or Down of the search from the Direction box Click Find Next button to start search for the first match data Click Find Next button again to find the next match data so on and so forth Click Cancel button to abort or stop the function 3 2 5 Setup Menu Basic Setup Function This function Is for setting up the basic parameters of the tool It includes the Record Option Display Setting and Reset three basic setting see Figure 3 16 Details are explained below E Els an USB Inspector E GBEInspectorl ga File n View Tool Windows Help ETE Figure 3 16 Setup Menus Record Function Displays the Device Speed and Memory capacity of the tool and Option controls the idle recording function Details The Inspector will automatically detect the speed full or low speed of the USB device and shows it in the Status box of the Inspector Setting dialog 22 box The same box also displays the SRAM size of the tool Operation Click Record Option command and the following dialog box Status Device Speed Full speed Memory 512k C Enable Disable Cancel Figure 3 17 Inspector Setting Dialog
11. ake packet if it receives data correctly but is not ready to handle this data packet 3 responses with STALL handshake packet to indicate that endpoint has some problems 4 does nothing if the data packet received encounters error Idle DAT AO Data Idle Handshake Error ITO Idle Hest Function Figure A3 9 Bulk Transaction Format Figure A3 10 shows Bulk Read and Bulk Write procedure In the Bulk Read transfer the host continues to issue bulk in transaction to request data from the device In the Bulk Write transfer the host continues to issue bulk out transaction to transmit data to the device Bulk OUT 0 OUT 1 ge OUT 0 1 Write OAT AO DATA OAT AO Bulk ae Read IN 0 IN 1 soi IN 011 DATAO DATA DATAONM Figure A3 10 Bulk Read and Write Figure A3 11 shows Interrupt Transaction Format Basically interrupt transaction is similar to bulk transaction Generally speaking interrupt transaction is generated by a regular time interval which is set in the endpoint descriptor 29 Idle Data Idle Handshake Data Error eae Data ACK Error Idle El Host Function Figure A3 11 Interrupt Transaction Format 30
12. ame or another PC by using another USB port When the driver program in the PC receives the coded data from the Inspector it will display the data on the monitor for you to analyze and debug The major features of the EZ USB 168 are as shown below Complies with the USB1 1 Full Speed amp Low Speed specification Auto detects Full Speed Low Speedi 512K X 8 bits SRAM included Uses USB1 1 port to communicate with the host PC and does not need extra power to operate Compact size easy to carry and saves space Easy installation and usage 009094 1 2 What You Should Get The standard shipment of the EZ USB 168 Inspector should consist of the following components packed in a box A main frame Two USB cables 1M and 1 8M 9 lt A compact disk containing the driver application and user manual A warranty 1 3 Specification Size EX WXH 14 60cmX9 60cmx2 50cm_ Weight 3259 SocketlHOSTI USB 11B Receptacle Package Socket 2 HOST2 USB 1 1 B Receptacle Note 1 USB 1 1 A Receptacle 1 0M USB 1 1 A Plug B Plug cable 1 8M USB 1 1 A Plug B Plug cable VBUS 4 15V 5 25V Current Consumption semi Normal Current Consumption 100mA Record Switch Reset NM Resetsystem Y POWER Lights up when Inspector is powered on UUN ERROR Lights up when inspector cannot be initialized LED correctly CONFIG Lights up when inspector is normally configure
13. can capture USB signals and then transmit them to the PC The EUSBinspector will save them in the memory Subsequent capture and 15 saving of the USB signals will overwrite the previous data saved in the memory If you want to keep the previous data for future use you have to save them to disk first with the Save As command Open command can retrieve them from the disk Operation Click the Open command and then the Open dialog box will appear Figure 3 4 Fay HESS iL 1 Y Example Files y EL Brte f6 hh usb E e 18 hh usb Em e lf hh usb Em e lhomsvi usb Em e fh h usb Em e lth h ush Bm E fh i usb EF E Ih usb Em E fh pl usb Em e Ihoh usb EF E Ih i usb tia a TENO usb Es eN fa oe eRe TI Figure 3 4 Open Dialog Box Select the desired filename example test usb and then click the Open button The captured data saved under test usb file is retrieved and shown in a sub window Figure 3 5 16 I Elan USB Inspector CAProgram FilesEMCXE BBinspeciodExample Filese 1h 80h usb km File Capture View Tool Setup Windows Help 5 x ss EO e 22 e B Y ee ADDR CRCS MC oe ee ot me 6153 00000001 ADDR CRCS DATAD CRC16 6157 00000001 43 DO 00 00 02 00 04 00 0x6F87 ADDR CRECES 6160 00000001 j Os96 oo2 00 0x15 gi ERE HBA te FI Data Length 1 Bytes NUM y Figure 3 5 Open Sub window Function Save the captured files to the disk The d
14. ction Is activated and the RECORD LED lights up automatically The Capture operation will be stopped in the two situations 1 Inspector s buffer is full 2 User clicks the Stop button Operation 18 1 Click the Record command and the recording process will display Figure 3 9 El Elan USB Inspector CAE ga File Capture View Tool Setup Windows Help 539 8 0 mm a B ADDR CRCS E LN ELI DATAT CRC16 00000001 00 FC FF DO 0x7ED8 587 00000001 DSB Reading Recording now DATA CACIG 00000001 00 F9 FF 00 07658 593 00000001 e Recording USB Bus Data Data Length 4 Bytes NUM 2 Figure 3 9 Recording USB Bus Data Window 2 At the same time a pop up window showing Recording now message appears while the RECORD LED of the tool flashes Meanwhile the captured data are stored in the memory Click Stop button to stop recording if necessary 3 2 3 View Menu View Management Sometimes we don t care the SOF or NAK packets We can hide them in the main window by the command in the View menu Hide SOF Packets and Hide NAK Packets Elan USB Inspector CP ro gram Fies EMI fim File Capture View Tool Setup Wir D E amp y Hide SOF Packets Hide HAE Packets 00000001 A NATAN Figure 3 10 19 ce Elan USB Inspector E kBlnspectorl gra File Capture Yiew Tool setup Windows Help Figure 3 11 3 2 4 Tool Menu Tool Box The purpose of the toolbox is to a
15. d I RECORD Lights up when inspector is recording USB signal NUN Transmission USB 1 1 Full speed Control and Bulk mode Transfer Mode Socket amp Sockets E Any one of the USB 1 1 transfer mode Transmission Mode Operating Range 5T to 40T I Operation Storage Range OT to 80T EN Environment Humidity 10 to 90 UN Certification CE FCC Class A PAN Product Elan offers one year limited warran many E Table 1 1 Note1 Please see section 1 4 the USB specification to rightly choose the cable 1 4 The USB Specification Connector type TYPE A gt Receptacles _ TYPE B gt Receptacles Figure 1 1 EZ USB 168 Connectors Shell Signal Name VBUS D D GND Shield Table 1 2 Figure 1 2 EZ USB 168 Cable Chapter 2 Installation 2 1 Hardware s Requirement IBM PC Pentium IV Speed 650Mhz 128M bytes RAM Two USB 1 1 ports A 1024X768 monitor A CD ROM 2 2 Hardware s Installation Figure 2 1 2 2 2 3 show USB Inspector outlook from different view Figure 2 1 USB Inspector vertical view 0 0 ADO MN Figure 2 2 USB Inspector lateral view 1 Figure 2 3 USB Inspector lateral view 2 MAIN MACHINE POWER ERROR CONFIG RECORD RESET HOSTI HOST2 DEVICE System power indicator System function error indicator Normal operation indicator USB signal record indicator To reset system Use for communication with PC Connector for Testing PC Connector
16. efault file extension is usb Details Only one captured buffer is available in the program Hence the program Cannot process two captured data at a time You must save the captured data in the hard disk for future reference Operation Click the Save As command and the Save dialog box will display Figure 3 6 Key in a filename and click the Save button to save the captured data ean RATED E Example Files dm t E ef hh usb EE e lOhh usb E Em e lf hh usb Em e Ih mwi usb Em e lth h usb EF E Thush Bm e on usb EF E Ih i usb 17 AJ Figure 3 6 Save Dialog Box Print Print amp Print preview is powerful WYSIWYG tool Help you to preview and print the captured packets for analysis Wi 143 144 ans a ade a EE rom Fe cen ema jinan daa fp I sa ES Edel AA Figure 3 7 Print Preview Exit Quit from the program 3 2 2 Capture Menu Recording Function The USB Inspector is designed to intercept the USB signals in the cable that is the major function of the tool Click on the Capture Menu and a resulting drop down menu will display the Record command Figure 3 8 I Elan USB Inspector E SBInspectorl File Mie Capture Tool Setup O W Ge Record Figure 3 8 Capture Menus Record Function To activate the Capture function Details The USB Inspector can detect the signal traffic on the USB line Whenever it senses any signal on the USB line the Capture fun
17. f a token packet optional data packet and optional handshake packet Specific packets are allowed required based on the transaction type Figure A3 6 shows Control Setup Transaction The host sends a setup token packet followed by a data packet to issue command to the device After the device receiving the command correctly it responses with an ACK handshake packet Idle Token Data Handshake ldle Host Function Figure A3 6 Control SETUP Transaction Figure A3 7 shows Control Read and Control Write sequences A control write sequence comprises of 3 stages Setup Data and Status The setup stage 1s a control setup transaction for issuing a command to the device The data stage comprises a series of out transaction for delivering data to the device The status stage is an in transaction with empty data packet for completing the control write transfer A control 27 read sequence also comprises of 3 stages Setup Data and Status The setup stage is a control setup transaction for issuing a command to the device The data stage comprises a series of in transaction for delivering data from the device to the host The status stage is an out transaction with empty data packet for completing the control read transfer Setup Data Status stage Stage Stage OI o E Control SETUP 0 OUT 1 OUT 0 me OUT 071 Write DATAO DATA DAT AO DAT AON DATAT ae SETUP 0 IN 1 IN 0 cs IN 0 1 OUT 1 ned TI D
18. for the Device Under Test STEP1 STEP2 STEP3 Choose driver source by STEP4 Turn on PC and wait for the Windows OS to be ready Connect the USB cable to the inspector HOST1 socket and the PC s USB port Windows will show finding new hardware Windows recognizes Found New Hardy ELAN USB INSPECTOR l ELAN USB INSPECTOR Installing press browse button In your CD ROM Device The file emcusb2k sys on Unknown is needed MEUSBinspector Driven L And press OK to continue ance Type the path where the file 13 located and then click LIE Copy files from EMEUSBInspector Driver Then you can see the Device Manager ELAN USB INSPECTOR icon is displayed under Action View Universal Serial Bus controllers in Device Manager m Computer Disk drives 22 DYDICD ROM drives Floppy disk controllers E Floppy disk drives IDE ATAJATAPI controllers Erg Keyboards y Mice and other pointing devices BH Network adapters 4 Ports COM amp LPT ti Soupg al EE EE al al al al E al al E a LSE Root Hub USE Root Hub VIA USB Universal Host Controller IA USB Universal Host Controller VIA USB Universal Host Controller STEP5 After completing installation correctly the inspectors POWER and CONFIG LEDs should be lighted on If not see the troubleshooting to the solution Troubleshooting If you can not complete
19. ition 1 Feb 22 2005 EZ USB 168 User menua FCC COMPLIANCE STATEMENT FOR AMERICAN USERS This equipment has been tested and found to comply with the limits for a CLASS A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense EMS AND EMI COMPLIANCE STATEMENT FOR EUROPEAN USERS This equipment has been tested and meet the requirements relating to electromagnetic compatibility based on the standards EN50081 1 EN55022 CLASS A and EN61000 4 2 3 4 5 6 8 11 IEC Teil 2 3 4 The equipment has also been tested and is verified to be within the European Standard EN55022 for the both Radiated and Conducted emissions limits Specifications are subject to change without notice EMS AND EMI COMPLIANCE STATEMENT sccccccccccscesesoesesoco 2 POR EUROPEAN USERS eea id 2 Chapter TS USD Inspector meie ka a E EE 4 ll AMO CON oe ee ee 4 t2 AMA ank E E i ka o oca a 5 ES je selu esiu
20. izard will guide you to install EUS Binspector software InstallShield Wizard Ia J1I I IMI InstallShield Wizard x Welcome to the InstallShield Wizard for EUSBinspector The InetallShield Wizard well install EUSB inspector on pour computer To continue click Mest Back Cancel Input your User Name and Company Name InstallShield Wizard l Customer Information Please enter your information Please enter your name and the name of the company for which wou work User Name ELAN Company NM ame A InstallShield 4 Back Cancel 11 Choose the setup type you want Setup Type Select the Setup Type to install Click the type of Setup you prefer then click Next ie Typical Program will be installed with the most common options Recommended for most Users STEP 4 Compact Program will be installed with minimum required options Custom You may choose the options you want to install Recommended for advanced UZETE InstallShield 4 Back Cancel Click the Finish button in the dialog box to complete the installation InstallShield Wizard InstallShield Wizard Complete Setup has finished installing EUSBinspector on your computer STEP 5 Back Eancel You can see the icon amp shortcut EUSBInspector in you desktop and Start menu Click it to Run EUSBinspector Programs Accessories Internet Explorer Documents STEP 6 Outlook Express Elan EL
21. s endpoint number in host to function transaction Address endpoint number in function to host transaction Start of Frame marker and frame number Address endpoint number in host to function transaction for SETUP to a control pipe Data packet PID even Data packet PID odd Receiver accepts error free data packet Rx device cannot accept data or Tx device cannot send data Endpoint is halted or a control pipe request is not supported Host issued preamble Enables downstream bus traffic to low speed devices Table A3 1 PID types These 4 types of packets are distinguished by the PID field in the packet content And their formats are different with each other 8 bits i bits 4 bits 5 bits ro e eef E SEN Figure A3 2 SETUP IN OUT token packet format a bits 11 bits 5 bits Figure A3 3 SOF packet format 26 A bits 0 1023 bytes 16 bits 70 ma ewe ss Figure A3 4 DATAO DATA l data packet format A bits Figure A3 5 ACK NAK STALL handshake packet format The PRE preamble PID is used when a hub is between the host and the LS device and the host wants to communicate with the LS device The host will attach preamble before the packet to the LS device Each time the hub detects the preamble it discards the preamble and forward the remaining LS packet content to the LS device Transaction In the USB specification transaction means that a delivery service to an endpoint consists o
22. ssist you to dig out the bugs hidden in the recorded USB data The menu offers the Decode Packet Report and Search commands Figure 3 12 E Elan US E Inspector CF rogram FlesEMOET kim File E Wie Tool palaj indon Figure 3 12 Tool Menu Decode Function To decode the setup command Details Quickly finds the setup token packet with the packet number you key in and decode the setup command by the USB spec Operation Click the Decode Packet command and the Decode Packet dialog box will Vato 3 13 Packet Number Figure 3 13 Decode Packet Dialog Box Key in the packet number you want to search and click OK button Function To report the information of the recorded USB signals Details lt is very difficult to directly trace the USB signal line by line without any Classification If you preview the statistics Report this will help you to quickly understand the recorded USB signal structurally after which it would be easy for you to trace and check the detailed signals Use this function whenever you have recorded a new USB signals It can save you a lot of time Operation 1 Click the Report command and a USB Bus Report dialog box will appear Figure 3 14 20 Bus Traffic Summary Address Endpoint Total 5 363 550 Control Transfer Packet Address Endpoint Direction Recipient bRequest i GET_DESCRIPTOR H D standard Dew DRES Figure
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