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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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91C94 датащи(PDF) 13 Page - SMSC Corporation |
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91C94 датащи(HTML) 13 Page - SMSC Corporation |
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13 / 120 page  13 PIN NUMBER QFP VTQFP/ TQFP NAME SYMBOL BUFFER TYPE DESCRIPTION 96 97 94 95 Crystal 1 Crystal 2 XTAL1 XTAL2 Iclk An external parallel resonance 20MHz crystal should be connected across these pins. If an external clock source is used, it should be connected to XTAL1 and XTAL2 should be left open 85 84 83 82 AUI Receive RECP RECN Diff. Input AUI receive differential inputs 79 78 77 76 AUI Transmit TXP/ nCOLL TXN/nCRS Diff. Output I INTERNAL ENDEC - (nXENDEC pin open). In this mode, TXP and TXN are the AUI transmit differential outputs. They must be externally pulled up using 150 ohm resistors EXTERNAL ENDEC - (nXENDEC pin tied low). In this mode the pins are inputs used for collision and carrier sense functions 83 82 81 80 AUI Collision COLP COLN Diff. Input AUI collision differential inputs. A collision is indicated by a 10MHz signal at this input pair 87 86 85 84 TPE Receive TPERXP TPERXN Diff. Input 10BASE-T receive differential inputs 77 75 75 73 TPE Transmit TPETXP TPETXN Diff. Output INTERNAL ENDEC - 10BASE-T transmit differential outputs 74 76 72 74 TPE Transmit Delayed TPETXDP TPETXDN Diff. Output 10BASE-T delayed transmit differential outputs. Used in combination with TPETXP and TPETXN to generate the 10BASE-T transmit pre-distortion 68 66 Transmit Clock PWRDWN/ TXCLK I with pullup INTERNAL ENDEC - Powerdown input. It keeps the LAN91C94 in powerdown mode when high (open). Must be low for normal operation EXTERNAL ENDEC - Transmit clock input from external ENDEC. 90 88 Bias Resistor RBIAS Analog Input A 22kohm 1% resistor should be connected between this pin and analog ground |
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