lan91c100 Standard Microsystems Corp., lan91c100 Datasheet - Page 6

• Manufacturer Part Number: lan91c100
• Description: Feast ? Ast Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

PQFP/TQFP
13,15,16
PIN NO.
108
177
178
190
54
55
52
53
51
DESCRIPTION OF PIN FUNCTIONSOF PIN FUNCTIONSPIN FUNCTIONS
nLocal
Device
nRead
Strobe
nWrite
Strobe
nData Path
Chip Select
EEPROM
Clock
EEPROM
Select
EEPROM
Data Out
EEPROM
Data In
I/O Base
Enable
EEPROM
NAME
nLDEV
nRD
nWR
nDATACS
EESK
EECS
EEDO
EEDI
IOS0-IOS2
ENEEP
SYMBOL
BUFFER
TYPE
O16
O4
O4
O4
IS
IS
IP
ID
IP
IP
6
Output. This active low output is asserted
when AEN is low and A4-A15 decode to the
LAN91C100 address programmed into the
high byte of the Base Address Register.
nLDEV is a combinatorial decode of
unlatched address and AEN signals.
Input.
interfaces.
Input.
interfaces.
Input.
Path can be accessed regardless of the
values of AEN, A1-A15 and the content of
the BANK SELECT Register. nDATACS
provides an interface for bursting to and
from the LAN91C100 32 bits at a time.
Output. 4 sec clock used to shift data in
and out of the serial EEPROM.
Output. Used for selection and command
framing of the serial EEPROM.
Output. Connected to the DI input of the
serial EEPROM.
Input. Connected to the DO output of the
serial EEPROM.
Input. External switches can be connected
to these lines to select between predefined
EEPROM configurations.
Input.
LAN91C100
EEPROM.
EEPROM is connected to the LAN91C100.
When nDATACS is low, the Data
Enables
Used
Used
DESCRIPTION
Must be grounded if no
accesses
(when
in
in
asynchronous
asynchronous
high
to
the
or
open)
serial
bus
bus