LAN9218 Datasheet, PDF (17/130 Pages) SMSC Corporation – High-Performance Single- Chip 10/100 Ethernet Controller with HP Auto-MDIX

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
Table 2.4 Serial EEPROM Interface Signals
PIN
NO.
NAME
SYMBOL
BUFFER
TYPE
NUM
PINS
DESCRIPTION
69
EEPROM Clock, EECLK/GPO4/
O8
GPO4 RX_DV, RX_DV/RX_CLK
RX_CLK
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.
Table 2.5 System and Power Signals (continued)
PIN
NO.
NAME
6
Crystal 1
5
Crystal 2
95
Reset
SYMBOL
XTAL1
XTAL2
nRESET
BUFFER
TYPE
lclk
Oclk
IS
(PU)
NUM
PINS
1
1
1
DESCRIPTION
External 25MHz Crystal Input.
Can also be connected to single-
ended TTL oscillator. If this method is
implemented, XTAL2 should be left
unconnected.
External 25MHz Crystal output.
Active-low reset input. Resets all
logic and registers within the
LAN9218. This signal is pulled
high with a weak internal pull-up
resistor. If nRESET is left
unconnected, the LAN9218 will
rely on its internal power-on reset
circuitry
Note:
The LAN9218 must always
be read at least once after
power-up, reset, or upon
return from a power-saving
state or write operations will
not function. See Section
3.12, "Detailed Reset
Description," on page 39 for
additional information
SMSC LAN9218
17
DATASHEET
Revision 1.5 (07-18-06)