LAN9420 Datasheet, PDF (17/171 Pages) SMSC Corporation – Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
NUM
PINS
NAME
EEPROM Data
GPO3
SYMBOL
EEDIO
GPO3
TX_EN
1
TX_EN
TX_CLK
TX_CLK
1
EEPROM Chip
Select
EEPROM
Clock
GPO4
1
RX_DV
EECS
EECLK
GPO4
RX_DV
RX_CLK
RX_CLK
Table 2.2 EEPROM
BUFFER
TYPE
DESCRIPTION
IS/O8
O8
O8
O8
O8
EEPROM Data: This bi-directional pin can be connected
to an optional serial EEPROM DIO.
General Purpose Output 3: This pin can also function as
a general purpose output. The EECS pin is deasserted so
as to never unintentionally access the serial EEPROM.
TX_EN Signal Monitor: This pin can also be configured
to monitor the TX_EN signal on the internal MII port. The
EECS pin is deasserted so as to never unintentionally
access the serial EEPROM.
TX_CLK Signal Monitor: This pin can also be configured
to monitor the TX_CLK signal on the internal MII port. The
EECS pin is deasserted so as to never unintentionally
access the serial EEPROM.
Serial EEPROM Chip Select.
IS/O8
(PU)
Note 2.1
O8
O8
O8
EEPROM Clock: Serial EEPROM Clock pin
General Purpose Output 4: This pin can also function as
a general purpose output. The EECS pin is deasserted so
as to never unintentionally access the serial EEPROM.
RX_DV Signal Monitor: This pin can also be configured
to monitor the RX_DV signal on the internal MII port. The
EECS pin is deasserted so as to never unintentionally
access the serial EEPROM.
RX_CLK Signal Monitor: This pin can also be configured
to monitor the RX_CLK signal on the internal MII port.
The EECS pin is deasserted so as to never
unintentionally access the serial EEPROM.
Note 2.1
This pin is used for factory testing and is latched on power up. This pin is pulled high
through an internal resistor and must not be pulled low externally. This pin must be
augmented with an external resistor when connected to a load. The value of the resistor
must be such that the pin reaches its valid level before de-assertion of PCInRST following
power up. The “IS” input buffer type is enabled only during power up. The “IS” input buffer
type is disabled at all other times.
SMSC LAN9420/LAN9420i
17
DATASHEET
Revision 1.6 (07-18-11)