SMSC TMC2005-JT Switch User Manual
Contents
1. sereen 11 OPTION FEATURE FOR NOISE CUT MODEB aa 1 APPLICATION NOTES uu uu L u rem DEDI 12 PORT GROUP i u 20 20 EXAMPLE FOR OPERATION MODE SETUP TO EACH reete nnn 20 NOTE FOR UNUSED PORT 20 EXAMPLE FOR POWER ON RESET 20 CONNECTING THE TMC2005 WITH INTERNAL PLL 21 METHOD TO CONNECT A CRYSTAL CLOCK n 22 u Q ua 22 CASCADING CONNECTION 23 RING NETWORK WITH THE TMC20052. TXENB1 1 48 VSS7 HM 2 47 nPULSE1 SE 3 46 nPULSE2 NC 4 45 nP1BAK LE 5 44 VDD5 EXTRX 6 43 nCKOEN ME 7 42 nRST VSS1 8 41 VSS6 9 TMC2005 JT 40 3nBJA VDD1 10 39 nBJB CKO 11 38 nBJE VSS2 12 37 nMBA CKM2 13 36 nMBB CKM1 14 35 nMBE CKMO 15 34 nEXTOD NC 16 33 NC 17 18 19 20 21 22 23 24 2526 27 28 29 30 31 32 Me gt gt lt lt gt gt Revision 1 1 07 24 07 Page 4 SMSC TMC2005 JT DATASHEET smsc BLOCK DIAGRAM nBJB nMBE SE SB SA nBJE nBJA ME ARCNET 5 Port HUB Controller LB LE Datasheet TTET OR Circuit a Circuit NOT gt OR Circuit gt Circuit Direction Control Circuit NOT OR Circuit Circuit 9 REELT 4 LA NOT Circuit NOT Circuit NOT Circuit Output Control Circuit TXENB0 TXENB1 nP1BAK nPULSE1 nPULSE2 Clock Multiplier PLL AND Circuit CKM2 AVSS RO nCKOEN CKM1 nPLLTST LP SMSC TMC2005 JT Page 5 DATASHEET Revision 1 1 07 24 07 ARCNET 5 Port HUB Controller Datasheet DESCRIPTION OF PIN FUNCTIONS
3. PIN NO NAME INPUT OUTPUT DESCRIPTION NOTE 1 TXENB1 OUTPUT Port B 1 Tx output to media transceiver Setting for traffic release time It should 2 HM INPUT be open for normal operation Pull up Port EXT Polar assignment for EXTRX 3 SE INPUT input 0 active Hi 1 active Low Pull up 4 NC Reserved It should be open Port EXT Polar assignment of EXT TX 5 LE INPUT output 0 active Low 1 active Hi Pull u Port EXT RX Data input from media 6 INPUT transceiver Pull up Port EXT Output mode assignment of EXTTX 0 pulse output 1 Tx control 7 ME INPUT output Pull up 8 VSS1 Ground 9 EXTTX OUTPUT Port EXT Output to media transceiver 10 VDD1 Power Supply 11 CKO OUTPUT Clock Output 12 VSS2 Ground 13 CKM2 INPUT Network speed data rate setting Pull up 14 CKM1 INPUT Pull up 15 CKMO INPUT Pull up 16 NC Reserved It should be open 17 RXFLT INPUT Test Pin It should be open Pull up Test Pin for PLL It should connected to 18 nPLLTST INPUT VDD Set to high 19 VDD2 Power Supply 20 XTLI INPUT X tal input External clock input 21 XTLO OUTPUT X tal output 22 VSS4 Ground 23 NC Reserved It should be open 24 VDD4 Power Supply 25 VDD3 Power Supply 26 AVDD Analog Power Supply 27 RO OUTPUT VCO output for internal PLL Connection pin to loop filter for internal 28 LP OUTPUT PLL 29 AGS INPUT Analog sense pin for internal PLL 30 AVSS Analog Ground 31 VSS3 Ground 32 VSS5 G
4. HYC9088 nPULSE2 DISABLE nPULSet ___ _ HYC4000 GND nTXEN nPULSE1 FIGURE 3 APPLICATION EXAMPLE 3 Only the TMC2005 and five transceivers are indicated in the figure above Connect the other pins properly Revision 1 1 07 24 07 Page 14 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller SMSC Example 4 on board type HUB with COM20020 and four optical transceivers in backplane mode 557 nPULSE1 m z c ITXENB1 1 jNC2 E IEXTRX 551 EXT TX DD1 552 CKM _ j 2 ao nPULSE1 nTXEN COM20020 RXIN FIGURE 4 APPLICATION EXAMPLE 4 Only the TMC2005 and four transceivers with the COM20020 are indicated in the above figure Connect the other pins adequately SMSC TMC2005 JT Page 15 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller ie smsc Example 5 An on board type HUB with COM20020 and four RS485 transceivers LLL FTTEEFEETEEEFEERERI a R 2 5 5 593 1 nRE AVSS LA 5 SN75176 RX
5. ITEMS RXIN First Active Edge to nPULSE1 First Active Edge nPULSE1 Low Pulse Width nPULSE1 High Pulse Width nPULSE1 Period RXIN Active Edge to nPULSE1 Active Edge Except First Edge of RXIN nPULSE1 to nPULSE2 Overlap nPULSE2 Low Pulse Width nPULSE2 High Pulse Width nPULSE2 Period MARK t12 t13 t1 t1 t1 t17 t18 t19 1 4Tdr 1 4Tdr UNIT REMARK 10 8Tdr 50 Note3 ns 550 nS Value at 2 5Mbps ma nS Value at 2 5Mbps 400 5 8Tdr 9 8Tdr 50 14 8Tdr 50 250 500 750 EN nS at 2 5Mbps Value at 2 5Mbps 2 S Value at 2 5Mbps Note3 S Value at 2 5Mbps 2 S 2 nS Value at 2 5Mbps nS Value at 2 5Mbps Period of data rate ex Tdr 400nS at 2 5Mbps Note1 Applied to TXENx which is set to Mx 1 Tx Control mode Note2 Applied to TXENx which is set to Mx 0 Pulse output mode Note3 Extra one Tdr time to be added at RXINx is set to nBUx 0 Big Jitter mode Revision 1 1 07 24 07 Page 30 DATASHEET SMSC TMC2005 JT ARCNET 5 Port HUB Controller smsc TMC2005 JT 64 TOFP PACKAGE OUTLINE D ns bt 99 100 101 ns 42 LE typ SMSC TMC2005 JT Page 31 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB
6. POWERSUPPLY VDD t6 Powersupply 5V GROUND j ssr Ground SMSC TMC2005 JT Page 9 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller ein smsc OPERATIONAL DESCRIPTION Direction Determination All TX ports are set to disable mode in the initial state When a signal is received from any RX ports the circuit holds the port on receiving mode disable TX and changes the other ports to sending mode disable RX One port stays in RX and the rest change into TX after all The circuit initializes the internal DPLL on the timing of received RX pulse and the RX buffer circuit stores the RX data and filters its jitter TX controlling circuit regenerates the stored RX pulse on nPULSE1 nPULSE2 and nP1BAK The nPULSE1 and nPULSE2 are pulse output pins for transceivers HYC9088A of ARCNET normal mode The nP1BAK is a pulse output pin for transceiver HY C5000 4000 2000 and RS485 driver of ARCNET back plane mode When using optical transceiver instead of these signals TXENA 0 1 TXENB 0 1 EXTTX MA MB ME 0 must be used as TX data inputs of the optical transceiver Direction Release On ARCNET protocol each TX message starts with 6 bits of 1 ALERT and each data byte is lead by three bits 1 1 0 preamble To control the HUBs direction the circuit monitors this bit pattern and holds the state If the end of the bit pattern comes all TX ports return receiving mode disable TX again
7. TMC2005 nRST POWER ON RESET CIRCUIT POR IC SMSC TMC2005 JT ARCNET 5 Port HUB Controller SMSE ee CONNECTING THE TMC2005 WITH INTERNAL PLL When using the TMC2005 at data rate 2 5Mbps or lower it is not necessary to use internal PLL Leave the loop filter pins RO LP open and connect AGS to the Ground The pins for the analog power supply AVSS AVDD may connect to digital power supply When using the TMC2005 at data rate 5Mbps or higher the internal PLL has to be used as a clock multiplier PCB layout must follow the guidelines at Figure 10 refer to Notes 1 through 5 GND Plane PWR Plane 0 1uF c TMC2005 10uF b 0 1uF a RO 68KQ C1 2200pF 2400pF FIGURE 10 PLL PATTERN LAYOUT Note 1 Prohibit the patterns for LP and RO from occupying the area of digital power supply Use the area of analog power supply between VAA and AVSS Note 2 Encircle the pattern between LP RO and AGS with wide pattern of analog ground Note 3 Connect the analog power supply VAA with 0 1 uF condenser a with in 1 8 inch 3 2mm from VAA pin Note 4 In order to filter the jitter of low frequency connect a 10 uF condenser b in parallel with the condenser a Note 5 Place 0 1 uF bypass condenser c within 74 inch 6 4mm from VDD3 and VSS3 Connect the ground side of a condenser c at the place where AVSS returns to GND plane SMSC TMC2005 JT Page 21 Revision 1 1 07 24 07 DATASHE
8. HYC9088 7 7 RX 18 nPULSE2 DISABLE SS HYC9088 Rx nPULSE2 DISABLE nPULSE1 10 1 2 TODX270A 5 LEDR 5 vec2 s 8 m 2 5 FIGURE 2 APPLICATION EXAMPLE 2 Only the TMC2005 and five transceivers are indicated in the above figure Connect the other pins adequately SMSC TMC2005 JT Page 13 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller i smsc Example 3 A five ports HUB with two optical transceivers two HYC9088s and a HYC4000 links three physical layers fiber optics dipulse and AC 485 N 2 1 2 oth 5V GND1 5 z lt Q U lt G LU G ow 220 GND2 gau gaa 5 TODX270A s SABES GES LEDR RXINAD VSSSs 2 EE VSS3L IN TXENAD _ LA 9 5 RXINA1 LPIL e MA ROL TXENA1 AVDD J vbb6 vppal vona TMC2005 RXINBO SB xto TXENBO xTuL 10 nn LB VDD2 RXINB1 nPLLTST rl RXFLTL m x aro 2 2 z GND4 Gin 8 5 GND2 TODX270A s GND3 LEDR 2 IN 5 e HYC9088 nPULSE2 HE DISABLE nPULSE1
9. FEATURE OUTPUT DESCRIPTION LP OUTPUT Using PLL Connect to an external condenser C 1 for loop filter Using no PLL must be open PLL OUTPUT VCO output Using PLL Connect to an external resistor RO for loop filter Using no PLL must be open AGS INPUT Analog sense input Using PLL Connect to loop filter Using no PLL Connect to ground Revision 1 1 07 24 07 Page 8 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller e smsc bins rn we AES FEATURE OUTPUT DESCRIPTION INST Must always connect to VDD AVDD Analog power supply Using PLL Analog power supply There are some limits on PCB pattern Using no PLL Power supply 5V same as VDD1 6 AVSS Analog ground Using PLL Analog ground There are some limits on PCB pattern Using PLL Use a ground same as VSS1 8 Other Signals INPUT FEATURES OUTPUT DESCRIPTION CRYSTAL XTLI INPUT Connect a 20MHz crystal INTERFACE When supplying an external clock input the clock to this pin CRYSTAL XTLO OUTPUT Connect 20MHz crystal INTERFACE When supplying an external clock it must be open SYSTEM RESET nRST INPUT Reset for initializing TMC2005 active INTERFACE Low TEST PIN OUTPUT Output internal clock of TMC2005 TEST PIN nCKOEN INPUT Output control of CKO 0 Output internal clock on CKO 1 Always output Low level on CKO Set 1 Normally TESTPIN Nena
10. DATASHEET ARCNET 5 Port HUB Controller SMSE Option Feature for Jitter Filtering When any RX ports receive the bigger jitter than its allowance the TMC2005 may fail to receive the data correctly and the network may be down However the below method to escape is effective for the case that a momentary big jitter occurs under a special condition like an optical transceiver 1 Bigjitter BJ mode The reference phase of the internal DPLL is changed from the first pulse to the second pulse by setting 0 to the big jitter mode pins nBJX This setup is effective for the case that a big jitter occurs when rising up from DC state as same as when using an optical transceiver with ATC function refer to complement Note The delay time of the TMC2005 becomes 400nS 2 5Mbps longer than the normal mode The delay time limits the maximum cable length and maximum node number Complement The big jitter may occur in the case of using an optical transceiver especially an optical receiver that has an ATC circuit that controls threshold level in proportion to received light strength The first pulse especially after long time idle has the big jitter but the second pulse is stabilized 2 Changing polar of RX port In order to filter the jitter of edge in one side it is effective to set reverse to pin SA SB SE to change the polarity of RX port Note Changing the polarity of RX port makes the delay time of the TMC2005 circuit a ha
11. HYC4000 ND H nTXEN Z nPULSE1 vret H vec 5 nRXIN T n gt E Vref Pe vee 7 7 nRXIN HYC4000 GND LS nTXEN nPULSE1 EC 3 nRXIN HYC4000 PHA GND nTXEN H nPULSE1 y nRXIN PH B HYC4000 GND nTXEN nPULSE1 ayo FIGURE 1 APPLICATION EXAMPLE Only the TMC2005 and five transceivers are indicated in the above figure Connect the other pins adequately Revision 1 1 07 24 07 Page 12 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller SMSC bise Example 2 A five ports HUB with HYC9088s and a optical transceiver TODX270A links the two physical layers dipulse and fiber optics HYC9088 RXNAO BRE 9 vsss SA vsss TXENAD Avss nPULSE2 DISABLE RXINA1 nPULSEI TXENA1 app VDD5 vppa w 2005 RXINBO vssa 58 TXENBO LB vpp2 RXINB1 nPLLTST HYC9088 5 G 33 T x Qu O uj x Q x O X X x x 1 k nPULSE2 DISABLE nPULSE1
12. 26 MAXIMUM GUARANTEED RATINGS 27 STANDARD OPERATING CONDITION eene tetetete sess esses esses sess esses sese 27 DCCHARACTERISTIC INPUT PIN u eterne Rn nna eatur asas DEP REPE OPE RR PER CE 27 DC CHARACTERISTIC OUTPUT PIN n enn nnn nnne 28 AC CHARACTERISTIC CLOCK AND nnn en e nnne nennen nnn nnn rere rennen 28 AC CHARACTERISTIC RX WAVEFORMS AND TX WAVEFORMS een 29 TMC2005 JT 64 PIN TQFP PACKAGE OUTLINE 31 SMSC TMC2005 JT Page 3 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller smsc CONFIGURATION RXINB1 RXINBO VSS8 NC VDD6 TXENA1 RXINA1 TXENAO RXINAO m m lt 0 gt lt 5 64 63 6261 60 59 58 57 56 55 54 53 52 51 50 49
13. The interval timer detects the end of the bit pattern During data is on line silent period is less than 4 uS because at least one bit 1 among 10 bits is received while receiving the data The minimum silent interval from the end of received data to the alert of the next data the minimum time of changing the direction is the chip turn around time 12 6 uS of ARCNET controller The interval timer to detect the data end is set to 5 6uS by adding some margin to the above interval for neglecting the reflection on a cable Note Numbers marked are at 2 5Mbps operation Jitter Filter To build a network with transceivers that introduce big jitter like ones for optical fiber the old HUB that has direction control only may cause a transmission error because jitters on each HUB are added when several HUBs were connected in serial The TMC2005 fixes that problem with jitter filtering and wave shaping through the following three steps 1 Input Sampling The TMC2005 samples a data on a network by eight times clock of the network data 2 Jitter Filtering DPLL The TMC2005 filters the jitter 100nS at 2 5Mbps of network data sampled by 8X clock through the internal digital PLL and stores the data into the buffer 3 Wave Shaping Output The TMC2006 re synchronizes and regenerates the network data at the same clock as the data rate The capability of the jitter filtering is shown below Revision 1 1 07 24 07 Page 10 SMSC TMC2005 JT
14. Controller Datasheet Revision 1 1 07 24 07 _i6_ A 135 44 145 B 022 027 SYMBOL MIN mm TYP mm MAX mm 09 014 L 04 075 Page 32 DATASHEET SMSC TMC2005 JT
15. at least one ring To protect from hang up the detecting time of the watch dog timer should be set to longer than 2 7 mS 2 5Mbps that is the burst time in the ARCNET protocol Note 3 Consider that a total of each segment delay time cable delay TMC2005 delay driver delay and receiver delay between HUBs in a network is less than 5 6uS 2 5Mbps The maxmimum distance between HUBs is approximiately 1000m 2 5Mbps Revision 1 1 07 24 07 Page 26 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller e smsc ee OPERATIONAL DESCRIPTION MAXIMUM GUARANTEED RATINGS Stresses above those listed may cause permanent damage to the device This is a stress rating only and functional operation of the device at these or any other condition above those indicated in the operational sections of this specification is not implied Note When powering this device from laboratory or system power supplies it is important that the Absolute Maximum Ratings not be exceeded or device failure can result Some power supplies exhibit voltage spikes or glitches on their output when the AC power is switch on or off In addition voltage transients on the AC power line may appear on the DC output If this possibility exists it is suggested that a clamp circuit be used Vss ITEM SYMBOL RATING UNIT POWER SUPPLY VOLTAGE 0 3 7 0 INPUT VOLTAGE 0 3 VDD 0 3 OUTPUT VOLTAGE VOUT 0 3 VDD 0 3 AMBIENT TEMPERATURE 40 125 STANDARD
16. 2 tl E RXINx 5 1 Received port 6 lt gt lt TXENy M 1 L 0 4 ports except received port 6 gt 7 8 gt nPIBAK TXENy M 0 L 0 P 4 ports except received port ul 12 t13 N 15 nPULSEI tl4 tl6 t17 t18 nPULSE2 19 FIGURE 18 RX WAVEFORMS AND WAVEFORMS ITEMS MARK MIN TYP MAX UNIT REMARK RXIN Low Pulse Width t1 RXIN High Pulse Width t2 RXIN Period 2 8Tdr 100 RXIN First Active Edge to TXEN Active 111 8Tdr 5 550 9 8Tdr 450 RXIN Last Active Edge to TXEN Inactive RXIN First Active Edge to nP1BAK TXEN First Active Edge nP1BAK TXEN Low Pulse Width nP1BAK TXEN High Pulse Width nP1BAK TXEN Period O RXIN Active Edge to nP1BAK TXEN Active Edge Except First Edge of RXIN 5 8Tdr 250 1 2Tdr 200 1 2Tdr 200 400 9 8Tdr 50 500 5 ojo o Value at 2 5Mbps 3 8Tdr 50 200 Note1 Value at 2 5Mbps e 112 8Tdr 50 5 650 Value at 2 5Mbps 10 8Tdr 50 Note2 Note3 550 Value at 2 5Mbps Note2 Value at 2 5Mbps 2 Note2 Value at 2 5Mbps 5 Note2 Value at 2 5Mbps O gt O 14 8Tdr 50 Note2 Note3 Value at 2 5Mbps O 750 SMSC TMC2005 JT Page 29 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller Datasheet
17. ET ARCNET 5 Port HUB Controller aiie smsc Method To Connect A Crystal Clock Connect with external parts as follows TMC2005 FIGURE 11 CONNECTING THE CRYSTAL CLOCK Note 1 When designing a printed circuit board keep the patterns as short as possible and don t cross with other patterns Note 2 When using an external clock like an oscillator module connect it to XTLI pin and leave XTLO pin open When designing a printed circuit board wire between XTLI pin and oscillator should be short as possible nPLLTST pin nPLLTST must be connect toVDD The rest of input pins have pull up resistors built in but nPLLTST pin does not have the pull up resistor Clock signal cannot ditributed into the TMC2005 if nPLLTST pin is connected GND or is left open Revision 1 1 07 24 07 Page 22 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller SMSE ee CASCADING CONNECTION HUBs can be connected in cascade by using the ports as Fig 12 In the case of cascade connection it is necessary to consider how many HUBs can exist in serial The maximum delay between input port and output port is 650ns 2 5Mbps at the TMC2005 It is equivalent to the propagation delay when a cable length is 135m For example if every cable length is 10m in Figure 12 the longest distance is physically 50m but it is electrically 590m because of multiplying 10m by 5 and 135m by 4 and the total propagation delay becomes 2 8uS
18. ETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Revision 1 1 07 24 07 Page 2 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller S5 T1 Datasheet TABLE OF CONTENTS uD sss usyasqa 1 GENERAL DESCRIPTION 1 PIN CONFIGURATION 4 BLOCK DIAGRAM 4 BLOCKIDIAGRAWMML uqu NEET SN NTR Do EE aman w a E E SSS 5 DESCRIPTION PIN FUNCTIONS 5 DESCRIPTION PIN FUNCTIONS 6 WX RXSIN TER 7 OPERATING MODE SETUP asa u Glas 8 8 OTHER SIGNALS I S uu TEM 9 OPERATIONAL DESCRIPTION 10 DIRECTION DETERMINATIQON L Sua La __6 _ ___ 10 DIRECTION RELEASE uence 10 JET TER E 10 OPTION FEATURE FOR JITTER
19. For analyzing the network timing consider the delay caused by HUBs In the ARCNET protocol it is defined that the longest distance between nodes is the maximum 6 4Km For example if 20 TMC2005s exist between nodes in the longest distance the actual cable length is 3 7Km because of deducting 135m by 20 in converting to cable length from 6 4Km TMC2005 TMC2005 TMC2005 TMCZ005 FIGURE 12 CASCADE CONNECTION OF 4 HUBS Two examples of eight ports HUBs using two TMC2005s are shown in Fig 13 and 14 If connecting as in Fig 13 eight TMC2005s exist between the nodes at both far ends On the other hand when assigning two ports for cascading connection to the same TMC2005 the number of TMC2005 in serial connection can be down to the number of HUBs plus two which can reduce the propagation delay SMSC TMC2005 JT Page 23 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller Datasheet smsc HUB 1 HUB2 HUB 3 HUBA 2005 2005 em o se o xo io H m om Hd Io Som FIGURE 13 CASCADE CONNECTION OF 8 PORT HUB HUB 1 HUB2 HUB 3 HUB4 22005 TMC2005 2005 24 se Nox Noo se Nox m NODE DE FIGURE 14 CASCADE CONNECTION OF 8
20. INAI LP AVDD VDD6 VDD3 TMC2005 w RXINBO vss4 XTLO TXENBO 02 RXINB1 nPLLTST 2 RXFLT 2 2 SN75176 L B zoz h rt s sS oo 8 D R 1 2 SN75176 DE a D 4 SN75176 nPULSEI nTXEN 0 20020 FIGURE 5 APPLICATION EXAMPLE 5 Only TMC2005 and four transceivers with the 20020 are indicated in the above figure Connect the other pins adequately Revision 1 1 07 24 07 Page 16 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller ise Example 6 An on board type HUB with a COM20020 two HYC4000s and two HYC9088s links two different physical layers dipulse and AC 485 S bo393anag vret yor HY04000 s 2 5 PHB 553 PHATE AVSS AGS nTXEN gt LP rPULSE R D 06 TMC2005 5 RX INBO 554 xTLO TX ENBO XTLI VOD Vret 58 1 NC1 5 NC2 LE EXTRX ME VSS1 001 4582 iCKM2 gt 2c 55 nPuLse2 2 DISABLE 2 HYC9088 nPULSE2 ri DISABLE nPULSE1 0 20020 FIGURE 6 APPLICATION EXAMPLE 6 Only the TMC2005 and four transceivers with the COM20020 are indica
21. OPERATING CONDITION Vss 0V DC CHARACTERISTIC INPUT PIN SYMBOL ITEM CONDITION MIN MAX UNIT XT nPLLTST 35 v ih High Level Input Voltage 22 L v Low Level input Voltage 08 v High Level Input Current VIN VDD IDD Dissipation Current Operating 10 mA SMSC TMC2005 JT Page 27 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller smsc DC CHARACTERISTIC OUTPUT PIN SYMBOL ITEM CONDITION MAX UNT PIN High Level Output Voltage IOH 4mA EARN 1 9 46 51 55 61 High Level Output Voltage IOH 8mA 24 V 114547 Low Level Output Voltage IOL 4mA 1 9 46 51 55 61 Low Level Output Voltage lOL mA 04 V 114547 AC CHARACTERISTIC CLOCK and RESET CTEM SYMBOL MN TYP MAX UNIT CONDITION Generating Static Time ms Clock Cyce 5 ns Clock Frequency Deflection 100 100 ppm Notei Clock Pulse Width cw 20 ns Reset Pulse Width 200 ns Note 1 Use only F 20MHz Note 2 VDD 4 5V FIGURE 17 CLOCK AND RESET Revision 1 1 07 24 07 Page 28 DATASHEET SMSC TMC2005 JT SMSE ARCNET 5 Port HUB Controller Datasheet AC CHARACTERISTIC Rx waveforms and Tx waveforms
22. PORT HUB Revision 1 1 07 24 07 Page 24 DATASHEET SMSC TMC2005 JT smsc ARCNET 5 Port HUB Controller Datasheet Fig 15 shows a 16 ports HUB with four TMC2005s connected by open drain ports When assigning two ports for cascade connection to the same TMC2005 the number of TMC2005s for serial connection can be reduced to the number of HUBs plus two HUB2 HUB 3 1 2005 1 2005 2005 2005 seo se se sN eo HUB 1 se IMC2005 MC2005 TMC2005 IMC2005 ENNY 2005 2005 2005 TMC2005 2005 Nox sN eo FIGURE 15 CASCADE CONNECTION OF 16 PORT HUB Note When connecting TMC2005 by open drain output on a board connecting TMC2005s must be four or less and the data rate must be 5Mbps or slower The pattern of open drain output has to be as short as possible less than 15cm SMSC TMC2005 JT Page 25 DATASHEET Revision 1 1 07 24 07 ARCNET 5 Port HUB Controller Bde smsc Ring Network With the TMC2005 The reliability of the network can be improved by connecting every node in a ring because the communication is maintained through the reverse route even if the cable is cut at a point However ARCNET controller alone can not supp
23. contain design defects or errors known as anomalies which may cause the product s functions to deviate from published specifications Anomaly sheets are available upon request SMSC products are not designed intended authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage Any and all such uses without prior written approval of an Officer of SMSC and further testing and or modification will be fully at the risk of the customer Copies of this document or other SMSC literature as well as the Terms of Sale Agreement may be obtained by visiting SMSC s website at http www smsc com SMSC is a registered trademark of Standard Microsystems Corporation SMSC Product names and company names the trademarks of their respective holders SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE TITLE AND AGAINST INFRINGEMENT AND THE LIKE AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT INCIDENTAL INDIRECT SPECIAL PUNITIVE OR CONSEQUENTIAL DAMAGES OR FOR LOST DATA PROFITS SAVINGS OR REVENUES OF ANY KIND REGARDLESS OF THE FORM OF ACTION WHETHER BASED ON CONTRACT TORT NEGLIGENCE OF SMSC OR OTHERS STRICT LIABILITY BREACH OF WARRANTY OR OTHERWISE WH
24. e Low 1 active Hi Pull up Port A 1 Rx data input from media 53 RXINA1 INPUT transceiver Pull up Port A Mode assignment for TXENAO A1 0 pulse output 1 Tx control 54 MA INPUT output Pull up 55 TXENA1 OUTPUT Port A 1 Tx output to media transceiver 56 VDD6 Power Supply 57 NC Reserved It should be open 58 VSS8 Ground Port B 0 Rx data input from media 59 RXINBO INPUT transceiver Pull up Port B Polar assignment for RXINAO A1 60 SB INPUT input O active Hi 1 Active Low Pull up 61 TXENBO OUTPUT Port B 0 Tx output to media transceiver Port B Polar assignment for TXENAO A1 62 LB INPUT output 0 Low 1 active Hi Pull up Port B 1 Rx data input from media 63 RXINB1 INPUT transceiver Pull up Port B Mode assignment for TXENAO A1 0 pulse output 1 TX control 64 MB INPUT output Pull up Note Pull up Input with a pull up resistor 30 FEATURE NAME INPUT OUTPUT DESCRIPTION INPUT Setup the polarity by SA SB SE n RX Port Polar Assignment RXINA 0 1 RXINB 0 1 EXTRX SA SB SE INPUT TX Port TX Control TX Port TX Data nPULSE 1 2 OUTPUT Output TX Port E nP1BAK OUTPUT SMSC TMC2005 JT RXINB 0 1 EXTTX 0 active H 1 active L enable signal Mx 1 OUTPUT Page 7 DATASHEET Setup the polarity of RXINA 0 1 TX data pulse Mx 0 or TX Setup TX mode by MA MB ME Setup the polarity by LA LB LE TX pulse data into HYC9068S SK 9088S SK
25. g one of 5 ports to open drain output the Hub can be expanded to either 12 or 16 ports ORDERING INFORMATION Order Number s TMC2005 JT for 64 pin TQFP Lead Free RoHS Compliant Package SMSC TMC2005 JT Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller smsc smsc 80 DRIVE HAUPPAUGE NY 11788 631 435 6000 631 273 3123 Copyright 2007 SMSC or its subsidiaries All rights reserved Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications Consequently complete information sufficient for construction purposes is not necessarily given Although the information has been checked and is believed to be accurate no responsibility is assumed for inaccuracies SMSC reserves the right to make changes to specifications and product descriptions at any time without notice Contact your local SMSC sales office to obtain the latest specifications before placing your product order The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC s standard Terms of Sale Agreement dated before the date of your order the Terms of Sale Agreement The product may
26. lf bit 200nS longer than original 2 5Mbps and the delay time affects the maximum cable length and maximum node number Option Feature for Noise Cut mode The Noise cut mode is enabled by setting pin nMBx sets 0 The noise cut mode is a function to remove the ringing noise and the reflection noise generated on the leading edge side of the input pulse to receive data input RXINx The position and the width of the dead band are shown in the figure below Dead band at Normal mode nMBx 1 Dead band at Noise cut mode nMBx 0 Period of data rate Tdr Tdr 8 1 clock Period of data rate Tdr Tdr 8 1 clock RXIN Active High Ideal waveform RXIN Active High Ideal waveform dead band Noise cut band dead band RXIN edge reference position RXIN edge reference position Generated by adjacent phase of SYNC character 1 1 0 Generated by adjacent phase of SYNC character 1 1 0 SMSC TMC2005 JT Page 11 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller smsc Datasheet APPLICATION NOTES Example 1 A five ports HUB with HYC4000s in backplane mode X O Zi 1 Su z gooss5agn vret H FEEPEEUECEEELERE 55255 2225 nRXIN 2 555 PH_B SA vss3 HYC 4000 PHA TXENAD AVSS GND AGS nTXEN RXINA1 LP nPULSE1 MA TXENA1 DD
27. ort ring because ARCNET is a half duplex communication system Using HUBs makes possible for ARCNET to built a ring network as in Fig 16 This configuration is available only for using fiber optics Refer to the application note for details Optical Transceiver COM20020 TMC2005 AY Optical Fiber COM20020 TMC2005 TMC2005 COM20020 nRESET 51 LY TMC2005 TXEN of any port COM20020 FIGURE 16 RING CONFIGURATION Note 1 Noise may cause an endless loop in a ring system and the network may hang up Therefore take care of designing the patterns between TMC2005 and transceiver or cabling of system Example for system hang up A noise occurs only at A point in Figure 16 The noise propagates clockwise on the network TMC2005 detects the noise that came back through the ring The noise causes an endless loop in the ring Example for no hang up Any noise occurs at A and B points in Figure 16 at the same time The noise propagates to both directions in the network An endless loop doesn t occur because TMC2005s in the middle absorb the noise from both sides Note 2 Place a watch dog timer on one of the TMC2005 in
28. round 33 NC Reserved It should be open Port EXT Open drain mode 0 open 34 nEXTOD INPUT drain output 1 normal output Pull up 35 nMBE INPUT Port EXT Noise cut 0 on 1 off Pull up 36 nMBB INPUT Port 1 Noise cut 0 on 1 off Pull up 37 nMBA INPUT Port BO B1 Noise cut 0 on 1 off Pull up Port EXT Jitters correct mode 0 big 38 nBJE INPUT jitters mode 1 normal mode Pull up Port 1 Jitters correct mode 0 big 39 nBJB INPUT jitter mode 1 normal mode Pull up Port BO B1 Jitter correct mode 0 6 40 nBJA INPUT jitter mode 1 normal mode Pull up 41 VSS6 Ground 42 nRST INPUT Internal reset signal active Low Pull up 43 nCKOEN INPUT Enable of CKO output Pull up Revision 1 1 07 24 07 Page 6 SMSC TMC2005 JT DATASHEET smsc ARCNET 5 Port HUB Controller Datasheet TX RX Interface PIN NO NAME INPUT OUTPUT DESCRIPTION NOTE 44 VDD5 Power Supply 45 nP1BAK OUTPUT nPULSE 1 output for backplane mode 46 nPULSE2 OUTPUT nPULSE2 output for normal mode 47 nPULSE1 OUTPUT nPULSE1 output for normal mode 48 VSS7 Ground Port A 0 Rx data input from media 49 RXINAO INPUT transceiver Pull up Port A Polar assignment for RXINAO A1 50 SA INPUT output 0 Hi 1 active Low Pull up 51 TXENAO OUTPUT Port A 0 Tx output to media transceiver Port A Polar assignment for 1 52 LA INPUT output O activ
29. sms TMC2005 JT SUCCESS BY DESIGN ARCNET 5 Port HUB Controller FEATURES Circuit for Protocol Data Rate From 156 25Kbps to 10Mbps Can Connect with HYC9088 in Normal Mode Can Connect with RS485 Transceiver Able to Connect Various Transceivers Directly HYC5000 4000 2000 Opt Module and TTL Device Includes TX RX Timing Circuit for 5 Port Interface in Backplane Mode Hub and Direction Control Circuit Jitter Correct Supports both Normal Backplane Mode at Circuit and Noise Cancel Circuit the Same Time for Media Conversion Easy to Design 8 12 Port Hub 5V Single Power GENERAL DESCRIPTION When configuring a network the maximum number of nodes and the maximum cable length are limited by the electric capacity of the transceiver In this case the network is expanded by an equipment called a HUB or repeater It maybe necessary to have a converter between coax T P and the fiber cable It is easy to design a HUB or a repeater because the TMC2005 has various features for expanding such network It can connect with HYC9088 RS485 transceiver HYC5000 4000 2000 and TTL interface for optical module It can connect with three different transceivers at the same time and convert the media of each The data rate cannot be converted It is necessary to operate all nodes in the same network at the same data rate The Hubs can be expanded by connecting two or more TMC2005 chips By settin
30. ted in the above figure Connect the other pins adequately SMSC TMC2005 JT Page 17 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller i smsc Example 7 An eight ports HUB are composed by using two TMC2005 Two TMC2005 connects the EXTTX signal with the EXTRX signal FIGURE 7 APPLICATION EXAMPLE 7 Only the two TMC2005s are indicated in the above figure Connect the other pins adequately Revision 1 1 07 24 07 Page 18 SMSC TMC2005 JT DATASHEET ARCNET 5 Port HUB Controller E gt Example 8 sixteen ports HUB composed by using four 2005 The EXT port between 2005 is made open drain mode and it connects it left example Or put standard logic IC such as 74LS20 outside right example This connected method is excellent in noised respect compared with connected method of open drain mode Data rate 5Mbps and below Data rate 10Mbps and below 2500 7452 TENA I PINAL ma THENAL TMC2005 or LP TMC2005 gt FIGURE 8 APPLICATION EXAMPLE 8 Only the four TMC2005s are indicated in the above figure Connect the other pins adequately Note Use the wiring pattern length that connects between four TMC2005s by five inches or less in open drain mode Four TMC2005s is maxim
31. um in open drain mode SMSC TMC2005 JT Page 19 Revision 1 1 07 24 07 DATASHEET ARCNET 5 Port HUB Controller Datasheet PORT GROUP smsc The five ports can be divided into three groups group A two ports group B two ports extension port one port and each group can select TX RX polar noise cut mode and big jitter mode respectively Select pins for each group are as follows EXTENSION po nEXTOD Various Setup Example For Operation Mode Setup To Each Port SB SE LA LB LE MB RXPOLAR TXPOLAR TRANSCEIVER __ 0 Acrtivetow Active Low HYC2485S HYC2488S 1 Active High ActiveHigh Optical Transceiver po 0 Active High Active Low HYC9088 HYC9068 Active High RS485 Transceiver Note for Unused port Unused ports can be left open because RX port RX input RX polar S input TX polar L input TX control M input pins have internal pull up resistors Because of internal pull up resistors select pins for noise cut nMB input big jitter nBJ input can be left open when used for setting OFF Example for Power On Reset Circuit ZS s 4 TuF HT POWER ON RESET CIRCUIT C R Revision 1 1 07 24 07 TMC2005 nRST 1 2 Spi 3 4 MB3771 NJM2103 8 s A 6 5 WT FIGURE 9 POWER ON RESET Page 20 DATASHEET
32. when ARCNET chip is at normal mode The pulse is always active Low TX pulse data into RS485 driver or HYC2485S 2488S when ARCNET chip is at backplane Revision 1 1 07 24 07 ARCNET 5 Port HUB Controller eH smsc FEATURE NAME INPUT OUTPUT DESCRIPTION mode The pulse is always active Low Polarity LA LB LE INPUT Setup the polarity of TXENA Setup 0 1 TXENB 0 1 EXTTX 0 active L 1 active H TX Port Mode Setup MA MB ME INPUT Setup the mode of TXENA 0 1 TXENB 0 1 EXTTX 0 Output TX pulse It is equivalent to OR nP1BAK 1 Output TX enable Operating Mode Setup INPUT FEATURE OUTPUT DESCRIPTION Data rate CKM 0 2 INPUT Terminal to setup the data rate of TMC2005 setu CKM2 CKM1 DIVISOR MULTIPLIER SPEED 0 16 x1 156 25 Kbps 0 x1 312 5 Kbps x1 625 Kbps x1 1 25 Mbps x1 2 5 Mbps x2 5 Mbps Reserved Reserved Reserved 1 x4 10 Mbps External clock is 20MHz Refer to VARIOUS SETUP Noise cut nMBA INPUT 0 Cut off noise from received data mode nMBB 1 Don t cut off noise nMBE Setup 0 normally Big jitter nBJA Setup a jitter filter feature mode nBJB Select a pulse as reference phase used by DPLL nBJE 0 2 pulse big jitter mode 1 1 pulse normal mode Open drain nEXTOD INPUT Setup a the use of EXTTX port mode 0 Set EXTTX as open drain output and use as Ext 1 Set EXTTX as normal output and use as 5 port Feature name
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