LAN9221 Datasheet, PDF (17/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
NAME
EEPROM Data,
GPO3, TX_EN,
TX_CLK
EEPROM Chip
Select
EEPROM Clock,
GPO4 RX_DV,
RX_CLK
Table 2.3 Serial EEPROM Interface Signals
SYMBOL
BUFFER
TYPE
EEDIO/GPO3/ VIS/VO8
TX_EN/TX_CLK
EECS
VO8
NUM
PINS
1
1
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.
Serial EEPROM chip select.
EECLK/GPO4/
RX_DV/RX_CLK
VO8
(PU)
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 interface is not
used, the EECLK pin must be left
unconnected.
Note:
When operating at reduced
VDDVARIO voltage levels (less than
3.0V), this pin must be pulled-up with
an external resistor. Refer to Section
2.2, "External Pull-Up/Pull-Down
Resistors" for more information.
Note:
This pin must not be pulled low by an
external resistor or driven low
externally under any conditions.
SMSC LAN9221/LAN9221i
17
DATASHEET
Revision 2.6 (12-04-08)