91C94 Datasheet, PDF (9/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

PIN NUMBER
VTQFP/
QFP TQFP
41
39
NAME
SYMBOL
A11/nFCS
BUFFER
TYPE
I
DESCRIPTION
ISA - Input - Input address line 11
42-48 40-46 Address
49
47
54
52 Address
Enable
A12-18
A19/nCE1
AEN/nREG
O4
I
I with
pullup
I with
pullup
PCMCIA - Output - Flash Memory Chip
Select used to access attribute
memory. Is active (low) when nREG=0,
nCE1=0 and A15=0
Input - Input address lines 12 through
18
ISA - Input - Input address line 19
PCMCIA - Card Enable 1 input. Used
to select card on even byte accesses
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/
I with ISA - Byte High Enable input. Asserted
nCE2
pullup (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/ OD24 with ISA - Output - Optionally used by the
nWAIT
pullup 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
PCMCIA - Output - Optionally used by
the LAN91C94 to extend host cycles
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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