DESCRIPTION OF PIN FUNCTIONSOF PIN FUNCTIONSPIN FUNCTIONS
PQFP/TQFP
PIN NO.
NAME
108
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.
Input.
interfaces.
Used
in
in
asynchronous
asynchronous
bus
bus
177
178
190
nRead
Strobe
nWrite
Strobe
nData Path
Chip Select
nRD
nWR
nDATACS
IS
IS
IP
Input.
Used
interfaces.
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.
Output. 4
µ
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. Enables (when high or open)
LAN91C100 accesses to the serial
EEPROM.
Must be grounded if no
EEPROM is connected to the LAN91C100.
54
55
52
53
13,15,16
EEPROM
Clock
EEPROM
Select
EEPROM
Data Out
EEPROM
Data In
I/O Base
EESK
EECS
EEDO
EEDI
IOS0-IOS2
O4
O4
O4
ID
IP
51
Enable
EEPROM
ENEEP
IP
6
SMSC [ SMSC CORPORATION ]
