SMC Networks SMC91C95 Product Manual page 14

PIN NO. NAME
16 n16 Bit
Modem
110 EEPROM
Clock
109 EEPROM
Chip Select
108 EEPROM
Data Out
107 EEPROM
Data In
103, I/O Base
105, 106
9 nTransmit
LED
nTransmit
Enable
12 nRoard
Select LED
Receive
Data
DESCRIPTION OF PIN FUNCTIONS
SYMBOL TYPE
nMIS16 I with pullup
EESK O4
EECS O4
EEDO/ O4
SDOUT
EEDI I with pull-
down
IOS0-IOS2 I with pullup
nTXLED OD16
nTXEN O162
nBSELED OD16
RXD I with pullup
14
DESCRIPTION
Input. When low, it indicates a 16 bit modem,
otherwise the modem is 8 bit wide. Used to
determine if nIOIS16 (PCMCIA) and nIOCS16
(ISA) need to be asserted for modem cycles.
The value of this pin may change from cycle
to cycle.
Output. 4 s clock used to shift data in and out
of the serial EEPROM.
Output. Serial EEPROM chip select.
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. The values of these
pins are readable. These pins are used in ISA
mode only. If in PCMCIA mode, these pins
are not used.
Internal ENDEC - Transmit LED output.
External ENDEC - Active low Transmit
Enable output.
Internal ENDEC - Board Select LED activated
by accesses to I/O space (nIORD or nIOWR
active with AEN low and valid address decode
for ISA, and with nREG low and and "Enable
Function" bit in the ECOR register is high for
PCMCIA). The pulse is stretched beyond the
access duration to make the LED visible.
External ENDEC - NRZ receive data input.