91C94 Datasheet, PDF (8/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

FUNCTION
AUI interface
LEDs
MISC.
ISA vs. PCMCIA PIN GROUPS
ISA
RECP
RECN
COLP
COLN
TXP/nCOLL
TXN/nCRS
nLNKLED/TXD
nRXLED/RXCLK
nBSELED/RXD
nTXLED/nTXEN
RBIAS
PWRDWN/TXCLK
nXENDEC
EN16
ROM
PCMCIA
RECP
RECN
COLP
COLN
TXP/nCOLL
TXN/nCRS
nLNKLED/TXD
nRXLED/RXCLK
nBSELED/RXD
nTXLED/nTXEN
RBIAS
PWRDWN/TXCLK
nXENDEC
EN16
PCMCIA
DESCRIPTION OF PIN FUNCTIONS
PIN NUMBER
VTQFP/
QFP TQFP
NAME
95
93 nROM/
nPCMCIA
28-30
32-38
39
26-28
30-36
37
Address
SYMBOL
nROM
A0-9
BUFFER
TYPE
I/O4 with
pullup
I
DESCRIPTION
This pin is sampled at the end of
RESET. When sampled low, the
LAN91C94 is configured for PCMCIA
operation and all pin definitions
correspond to the PCMCIA mode. For
ISA operation, this pin is left open and
is used as a ROM chip select output. It
turns active when MEMR* is low and
the address bus contains a valid ROM
address. In ISA mode the LAN91C94
is pin compatible with the LAN91C92
Input - Input address lines 0 through 9
A10/nFWE
I
ISA - Input - Input address line 10
O4
PCMCIA - Output - Flash Memory
Write Enable used for programming
attribute memory. Is active (low) when
nWE=0 and COR2=1
8