LAN9117 Datasheet, PDF (10/114 Pages) SMSC Corporation – HIGH PERFORMANCE SINGLE-CHIP 10/100 NON-PCI ETHERNET CONTROLLER

LAN9117
TABLE 2-4: SERIAL EEPROM INTERFACE SIGNALS
Pin No.
Name
Symbol
Buffer
Type
# Pins
67
EEPROM Data,
EEDIO/GPO3/
I/O8
1
GPO3, TX_EN, TX_EN/TX_CLK
TX_CLK
Description
EEPROM Data: This bi-directional pin
can be connected to a serial
EEPROM DIO. This is optional.
General Purpose Output 3: This pin
can also function as a general
purpose output, or it can be
configured to monitor the TX_EN or
TX_CLK signals on the internal MII
port. When configured as a GPO
signal, or as a TX_EN/TX_CLK
monitor, the EECS pin is deasserted
so as to never unintentionally access
the serial EEPROM. This signal
cannot function as a general-purpose
input.
68
EEPROM Chip
EECS
O8
Select
69
EEPROM Clock, EECLK/GPO4/
O8
GPO4 RX_DV, RX_DV/RX_CLK
RX_CLK
1
Serial EEPROM chip select.
1
EEPROM Clock: Serial EEPROM
Clock pin.
General Purpose Output 4: This pin
can also function as a general-
purpose output, or it can be
configured to monitor the RX_DV or
RX_CLK signals on the internal MII
port. When configured as a GPO
signal, or as an RX_DV/RX_CLK
monitor, the EECS pin is deasserted
so as to never unintentionally access
the serial EEPROM. This signal
cannot function as a general-purpose
input.
Note:
When the EEPROM inter-
face is not used, the
EECLK pin must be left
unconnected.
TABLE 2-5:
Pin No.
6
SYSTEM AND POWER SIGNALS
Name
Symbol
Buffer
Type
Crystal 1
XTAL1
lclk
5
Crystal 2
XTAL2
Oclk
# Pins
Description
1 External 25MHz Crystal Input.
Can also be connected to single-ended
TTL oscillator. If this method is
implemented, XTAL2 should be left
unconnected.
1 External 25MHz Crystal output.
DS00002267A-page 10
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