91C94 Datasheet, PDF (11/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

PIN NUMBER
VTQFP/
QFP TQFP
NAME
25
23 nI/O 16
51
49 nI/O Read
52
50
53
51
7
5 EEPROM
Clock
6
4 EEPROM
Select
4
2 EEPROM
Data Out
5
3 EEPROM
Data In
98, 96,97 I/O Base
99,1
99
72
70 nTransmit
Led/
nTransmit
Enable
SYMBOL
nIOCS16/
nIOIS16
nIORD
nIOWR
nMEMR/
nOE
EESK
EECS
BUFFER
TYPE
OD24
IS with
pullup
IS with
pullup
IS with
pullup
O4
O4
DESCRIPTION
ISA - Active low output asserted in 16
bit mode when AEN is low and A4-A15
decode to the LAN91C94 address
programmed into the high byte of the
Base Address Register
PCMCIA - Active low output asserted
whenever the LAN91C94 is in 16 bit
mode, COR0 bit is high, and REG* is
low
Input - Active low read strobe to
access the LAN91C94 IO space
Input - Active low write strobe to
access the LAN91C94 IO space
ISA - Active low signal used by the
host processor to read from the
external ROM.
PCMCIA - Output Enable input used to
read from the COR, CSR, and attribute
memory
Output - 4usec clock used to shift data
in and out of a serial EEPROM
Output - Serial EEPROM chip select
EEDO/
SDOUT
EEDI
IOS0-2
nTXLED/
nTXEN
O4
Output - Connected to the DI input of
the serial EEPROM
I with pull- Input - Connected to the DO output of
down the serial EEPROM
I with
pullup
Input - External switches can be
connected to these lines to select
between predefined EEPROM
configurations. The values of these
pins are readable
OD16
INTERNAL ENDEC - Transmit LED
output
O162
EXTERNAL ENDEC - Active low
Transmit Enable output
11