SMC91C100 Datasheet, PDF (6/83 Pages) List of Unclassifed Manufacturers – FEAST Fast Ethernet Controller

PIN NO.
108
177
178
190
54
55
52
53
13,15,16
51
NAME
nLocal
Device
nRead
Strobe
nW rite
Strobe
nData Path
Chip Select
EEPROM
Clock
EEPROM
Select
EEPROM
Data Out
EEPROM
Data In
I/O Base
Enable
EEPROM
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL
TYPE
DESCRIPTION
nLDEV
O16 Output. This active low output is asserted
when AEN is low and A4-A15 decode to the
SMC91C100 address programmed into the
high byte of the Base Address Register.
nLDEV is a combinatorial decode of unlatched
address and AEN signals.
nRD
IS
Input. Used in asynchronous bus interfaces.
nW R
IS
Input. Used in asynchronous bus interfaces.
nDATACS
EESK
EECS
EEDO
EEDI
IOS0-IOS2
ENEEP
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
SMC91C100 32 bits at a time.
O4
Output. 4 µsec clock used to shift data in and
out of the serial EEPROM.
O4
Output. Used for selection and command
framing of the serial EEPROM.
O4
Output. Connected to the DI input of the serial
EEPROM.
ID
Input. Connected to the DO output of the serial
EEPROM.
IP
Input. External switches can be connected to
these lines to select between predefined
EEPROM configurations.
IP
Input. Enables (when high or open)
SMC91C100 accesses to the serial EEPROM.
Must be grounded if no EEPROM is connected
to the SMC91C100.
6