Справочник Пользователя для SMSC LAN9312
High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08)
28
SMSC LAN9312
DATASHEET
3.2
Pin Descriptions
This section contains the descriptions of the LAN9312 pins. The pin descriptions have been broken
into functional groups as follows:
into functional groups as follows:
.
Table 3.1 LAN Port 1 Pins
PIN
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
89-92
Port 1 LED
Indicators
nP1LED[3:0]
OD12
LED Indicators: When configured as LED outputs
via the
via the
,
these pins are open-drain, active low outputs and
the pull-ups and input buffers are disabled. The
functionality of each pin is determined via the
LED_CFG[9:8] bits.
the pull-ups and input buffers are disabled. The
functionality of each pin is determined via the
LED_CFG[9:8] bits.
General
Purpose I/O
Data
GPIO[3:0]
IS/O12/
OD12
(PU)
General Purpose I/O Data: When configured as
GPIO via the
GPIO via the
, these general purpose signals are
fully programmable as either push-pull outputs,
open-drain outputs or Schmitt-triggered inputs by
writing the
open-drain outputs or Schmitt-triggered inputs by
writing the
. The
pull-ups are enabled in GPIO mode. The input
buffers are disabled when set as an output.
buffers are disabled when set as an output.
Note:
See
for additional details.
110
Port 1
Ethernet TX
Negative
TXN1
AIO
Ethernet TX Negative: Negative output of Port 1
Ethernet transmitter. See
Ethernet transmitter. See
for additional
information.
111
Port 1
Ethernet TX
Positive
TXP1
AIO
Ethernet TX Positive: Positive output of Port 1
Ethernet transmitter. See
Ethernet transmitter. See
for additional
information.
115
Port 1
Ethernet RX
Negative
RXN1
AIO
Ethernet RX Negative: Negative input of Port 1
Ethernet receiver. See
Ethernet receiver. See
for additional
information.
116
Port 1
Ethernet RX
Positive
RXP1
AIO
Ethernet RX Positive: Positive input of Port 1
Ethernet receiver. See
Ethernet receiver. See
for additional
information.