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91C94 Datasheet(PDF) 11 Page - SMSC Corporation

Part # 91C94
Description  ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

91C94 Datasheet(HTML) 11 Page - SMSC Corporation

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11
PIN NUMBER
QFP
VTQFP/
TQFP
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
25
23
nI/O 16
nIOCS16/
nIOIS16
OD24
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
51
49
nI/O Read
nIORD
IS with
pullup
Input - Active low read strobe to
access the LAN91C94 IO space
52
50
nIOWR
IS with
pullup
Input - Active low write strobe to
access the LAN91C94 IO space
53
51
nMEMR/
nOE
IS with
pullup
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
7
5
EEPROM
Clock
EESK
O4
Output - 4usec clock used to shift data
in and out of a serial EEPROM
6
4
EEPROM
Select
EECS
O4
Output - Serial EEPROM chip select
4
2
EEPROM
Data Out
EEDO/
SDOUT
O4
Output - Connected to the DI input of
the serial EEPROM
5
3
EEPROM
Data In
EEDI
I with pull-
down
Input - Connected to the DO output of
the serial EEPROM
98,
99,1
96,97
99
I/O Base
IOS0-2
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
72
70
nTransmit
Led/
nTransmit
Enable
nTXLED/
nTXEN
OD16
O162
INTERNAL ENDEC - Transmit LED
output
EXTERNAL
ENDEC
-
Active
low
Transmit Enable output


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