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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83902A датащи(PDF) 7 Page - National Semiconductor (TI) |
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DP83902A датащи(HTML) 7 Page - National Semiconductor (TI) |
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7 / 70 page  20 Pin Description (Continued) PQFP PLCC AVJG Pin IO Description Pin No Pin No Pin No Name NETWORK INTERFACE PINS (Continued) 75 72 72 AUI I AUITPI SELECT A TTL level active high input that selects either the TPI AUI interface or the TPI module for interface with the ENDEC module When high the AUI is selected when low the TPI is selected 76 77 73 74 74 75 TXb O AUI TRANSMIT OUTPUT Differential driver which sends the encoded TXa data to the transceiver The outputs are source followers which require 270X pulldown resistors 82 83 78 79 80 81 RXb I AUI RECEIVE INPUT Differential receive input pair from the RXa transceiver 84 85 80 81 82 83 CDb I AUI COLLISION INPUT Differential collision pair input from the CDa transceiver 87 83 85 SNISEL I FACTORY TEST INPUT For normal operation tied to VCC When low enables the ENDEC module to be tested independently of the DP83902A module 88 84 86 CRS O CARRIER SENSERECEIVE A TTLMOS level active high signal It is RX asserted for approximately 50 ms whenever valid transmit or receive data is detected while in AUI mode or receive data is detected while in TPI mode POWER SUPPLY PINS (DIGITAL) 21 46 89 1 27 47 18 43 87 VCC POSITIVE 5V SUPPLY PINS 20 34 48 2 26 39 17 32 46 GND NEGATIVE (GROUND) SUPPLY PINS It is suggested that a 68 90 49 64 64 88 decoupling capacitor be connected between the VCC and GND pins POWER SUPPLY PINS (ANALOG) 93 4 90 VCC VCO 5V SUPPLY PIN Care should be taken to reduce noise on this pin as it supplies power to the analog VCO to the Phase Lock Loop 92 3 89 GND VCO GROUND SUPPLY PIN Care should be taken to reduce noise on this pin as it supplies ground to the analog VCO to the Phase Lock Loop 63 60 60 VCC TPI RECEIVE 5V SUPPLY Power pin supplies 5V to the Twisted Pair Interface Receiver 66 63 63 GND TPI RECEIVE GROUND Ground pin for the Twisted Pair Interface Receiver 61 59 59 VCC TPI TRANSMIT 5V SUPPLY Power pin supplies 5V to the Twisted Pair Interface Transmitter 60 58 58 GND TPI TRANSMIT GROUND Ground pin for the Twisted Pair Interface Transmitter 81 77 79 VCC AUI RECEIVE 5V SUPPLY Power pin supplies 5V to the AUI Interface Receiver 86 82 84 GND AUI RECEIVE GROUND Ground pin for the AUI Interface Receiver 80 76 77 VCC AUI TRANSMIT 5V SUPPLY Power pin supplies 5V to AUI Interface Transmitter 79 75 76 GND AUI TRANSMIT GROUND Ground pin for the AUI Interface Transmitter NO CONNECTION 3 9 13 16 24 25 1 5 8 16 NC NO CONNECTION Do not connect to these pins 19 24 35 38 65 66 19 24 33 40 44 53 54 38 41 44 57 62 67 78 51 52 53 91 94 97 68 70 73 78 91 94 97 7 |
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