High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX & Industrial Temperature Support
Datasheet
Table 2.3 LAN Interface Signals
PIN
NO.
BUFFER
TYPE
NUM
PINS
NAME
SYMBOL
DESCRIPTION
79
78
83
82
87
TPO+
TPO+
AO
AO
AI
1
1
1
1
1
Transmit Positive Output (normal)
Receive Positive Input (reversed)
TPO-
TPI+
TPI-
TPO-
TPI+
Transmit Negative Output (normal)
Receive Negative Input (reversed)
Receive Positive Input (normal)
Transmit Positive Input (reversed)
TPI-
AI
Receive Negative Input (normal)
Transmit Negative Output (reversed)
PHY External Bias
Resistor
EXRES1
AI
Must be connected to ground through
a 12.4K ohm 1% resistor.
Note: The pin names for the twisted pair pins shown above apply to a normal connection. If HP Auto-
MDIX is enabled and a reverse connection is detected, or a reverse connection is manually
selected, the input pins become outputs, and vice-versa, as indicated in the descriptions.
Table 2.4 Serial EEPROM Interface Signals
PIN
NO.
BUFFER
TYPE
NUM
PINS
NAME
SYMBOL
DESCRIPTION
67
EEPROM Data,
GPO3, TX_EN,
TX_CLK,
EEDIO/GPO3/
TX_EN/TX_CLK
(D32/nD16)
I/O8
1
EEPROM Data: This bi-directional
pin can be connected to a serial
EEPROM DIO. This is optional.
D32/nD16
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.
Data Bus Width Select: This signal
also functions as a configuration
input on power-up and is used to
select the host bus data width. Upon
deassertion of reset, the value of the
input is latched. When high, a 32-bit
data bus is utilized. When low, a 16-
bit interface is utilized.
68
EEPROM Chip
Select
EECS
O8
1
Serial EEPROM chip select.
Revision 1.5 (07-18-06)
SMSC LAN9218I
DATA1S6HEET
SMSC [ SMSC CORPORATION ]
