SMC Networks SMC91C95 Product Manual page 15

PIN NO. NAME
10 nReceive
LED
Receive
Clock
11 nLink LED
Transmit
Data
111 Enable
EEPROM
115 nEnable 16
Bit
101 Crystal 1
102 Crystal 2
123 AUI Receive
124
2 AUI
Transmit
3
DESCRIPTION OF PIN FUNCTIONS
SYMBOL TYPE
nRXLED OD16
RXCLK I with pullup
nLNKLED OD16
TXD 0162
ENEEP I with pullup
nEN16 I with pullup
XTAL1 Iclk
XTAL2
RECP Diff. Input
RECN
TXP/nCOLL Diff.
TXN/nCRS Output
I
15
DESCRIPTION
Internal ENDEC - Receive LED output.
External ENDEC - Receive clock input.
Internal ENDEC - Link LED output.
External ENDEC - Transmit Data output.
Input. This active high input enables the
EEPROM to be read or written by the
SMC91C95. Internally pulled up. Must be
connected to ground if no serial EEPROM is
used. In PCMCIA mode, a parallel EEPROM
is required if no serial EEPROM is used.
Input. When low the SMC91C95 is configured
for 16 bit bus operation. If left open the
SMC91C95 works in 8 bit bus mode. 16 bit
configuration can also be programmed via
serial EEPROM (In ISA Mode only) or via
software initialization of the CONFIGURATION
REGISTER.
An external parallel resonance 20 MHz crystal
should be connected across these pins. If an
external clock source is used, it should be
connected to XTAL1 and XTAL2 should be
left open.
AUI receive differential inputs.
Internal ENDEC - (nXENDEC pin open). In
this mode TXP and TXN are the AUI transmit
differential outputs. They must be externally
pulled up using 150 ohm resistors.
External ENDEC - (nXENDEC pin tied low).
In this mode the pins are inputs used for
collision and carrier sense functions.