LAN91C100 Datasheet, PDF (6/101 Pages) SMSC Corporation – FEAST™ Fast Ethernet Controller

DESCRIPTION OF PIN FUNCTIONSOF PIN FUNCTIONSPIN FUNCTIONS
PQFP/TQFP
PIN NO.
108
NAME
nLocal
Device
SYMBOL
nLDEV
BUFFER
TYPE
O16
DESCRIPTION
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.
177
nRead
nRD
Strobe
IS
Input.
Used in asynchronous bus
interfaces.
178
nWrite
Strobe
nWR
IS
Input. Used in asynchronous bus
interfaces.
190
nData Path nDATACS
Chip Select
IP
Input. When nDATACS is low, the Data
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.
54
EEPROM EESK
Clock
O4
Output. 4 µsec clock used to shift data in
and out of the serial EEPROM.
55
EEPROM EECS
Select
O4 Output. Used for selection and command
framing of the serial EEPROM.
52
EEPROM EEDO
Data Out
O4 Output. Connected to the DI input of the
serial EEPROM.
53
EEPROM EEDI
Data In
ID
Input. Connected to the DO output of the
serial EEPROM.
13,15,16 I/O Base IOS0-IOS2
IP
Input. External switches can be connected
to these lines to select between predefined
EEPROM configurations.
51
Enable
ENEEP
EEPROM
IP
Input. Enables (when high or open)
LAN91C100 accesses to the serial
EEPROM. Must be grounded if no
EEPROM is connected to the LAN91C100.
6