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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) 9 Page - SMSC Corporation |
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91C94 датащи(HTML) 9 Page - SMSC Corporation |
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9 / 120 page  9 PIN NUMBER QFP VTQFP/ TQFP NAME SYMBOL BUFFER TYPE DESCRIPTION 41 39 A11/nFCS I O4 ISA - Input - Input address line 11 PCMCIA - Output - Flash Memory Chip Select used to access attribute memory. Is active (low) when nREG=0, nCE1=0 and A15=0 42-48 40-46 Address A12-18 I Input - Input address lines 12 through 18 49 47 A19/nCE1 I with pullup ISA - Input - Input address line 19 PCMCIA - Card Enable 1 input. Used to select card on even byte accesses 54 52 Address Enable AEN/nREG I with pullup ISA - Address enable input. Used as an address qualifier. Address decoding is enabled only when AEN is low PCMCIA - Attribute memory and IO select input. Asserted when the card attribute space or IO space is being accessed 26 24 nByte High nSBHE/ nCE2 I with pullup ISA - Byte High Enable input. Asserted (low) by the system to indicate a data transfer on the upper data byte PCMCIA - Card Enable 2 input. To select card on odd byte accesses 55 53 Ready IOCHRDY/ nWAIT OD24 with pullup ISA - Output - Optionally used by the LAN91C94 to extend host cycles PCMCIA - Output - Optionally used by the LAN91C94 to extend host cycles 57-60 62-65 9-12 14-17 55-58 60-63 7-10 12-15 Data Bus D0-15 I/O24 Bidirectional - 16 bit data bus to access the LAN91C94 internal registers. The data bus has weak internal pullups. Supports direct connection to the system bus without external buffering |
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