lxt9781 Intel Corporation, lxt9781 Datasheet - Page 19

• Manufacturer Part Number: lxt9781
• Description: Fast Ethernet 10/100 Multi-port Transceiver With Rmii
• Manufacturer: Intel Corporation

Datasheet
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain, OS = Open Source.
2. Ports 6 and 7 are available only on the LXT9781. These pins are not bonded out on the LXT9761.
PQFP
Table 7. LXT97x1 LED Signal Descriptions
9761
Pin#
177
176
175
174
173
172
171
170
200
201
202
197
198
199
186
187
188
168
169
203
204
205
PQFP
177
176
175
174
173
172
171
170
168
169
203
204
205
200
201
202
197
198
199
194
195
196
9781
Pin#
PBGA
D12
C13
C14
D13
B13
A14
A13
B14
A15
B15
D6
C5
D7
C6
C7
D8
B5
A5
A6
B6
A7
B7
Fast Ethernet 10/100 Multi-Port Transceiver with RMII — LXT9761/9781
LEDS_0
LEDS_1
LEDS_2
LEDS_3
LEDS_4
LEDS_5
LEDS_6
LEDS_7
LEDCLK
LEDLATCH
LED/CFG0_1
LED/CFG0_2
LED/CFG0_3
LED/CFG1_1
LED/CFG1_2
LED/CFG1_3
LED/CFG2_1
LED/CFG2_2
LED/CFG2_3
LED/CFG3_1
LED/CFG3_2
LED/CFG3_3
Symbol
I/OD/OS
I/OD/OS
I/OD/OS
I/OD/OS
Type
O
O
O
1
Serial LEDs 0 - 7. Each serial LED output indicates a
particular status condition for every port. Bit 0 is assigned
to Port 0, bit 1 to Port 1, etc. There are 8 possible LEDs
per port, for a total of 48 display LEDs. However, typical
equipment designs use no more than 3 LEDs per port,
selected by the designer. Using per-event, rather than
per-port outputs reduces the number of serial shift
registers required. Instead of requiring an external serial-
to-parallel shift register for each port, this method
requires only one per LED type, reducing board space
and component costs. Refer to
on page 38
LED Clock. 1 MHz clock for LED serial data output.
LED Framing. Framing signal for serial LED outputs.
Port 0 LED Drivers 1 -3. These pins drive LED
indicators for Port 0. Each LED can display one of
several available status conditions as selected by the
LED Configuration Register (refer to
for details).
Port 0 Configuration Inputs 1-3. When operating in
Hardware Control Mode, these pins also provide
configuration control options (refer to
for details).
Port 1 LED Drivers 1 -3. These pins drive LED
indicators for Port 1. Each LED can display one of
several available status conditions as selected by the
LED Configuration Register (refer to
for details).
Port 1 Configuration Inputs 1-3. When operating in
Hardware Control Mode, these pins also provide
configuration control options (refer to
for details).
Port 2 LED Drivers 1 -3. These pins drive LED
indicators for Port 2. Each LED can display one of
several available status conditions as selected by the
LED Configuration Register (refer to
for details).
Port 2 Configuration Inputs 1-3. When operating in
Hardware Control Mode, these pins also provide
configuration control options (refer to
for details).
Port 3 LED Drivers 1 -3. These pins drive LED
indicators for Port 3. Each LED can display one of
several available status conditions as selected by the
LED Configuration Register (refer to
for details).
Port 3 Configuration Inputs 1-3. When operating in
Hardware Control Mode, these pins also provide
configuration control options (refer to
for details).
for details.
Signal Description
“Serial LED Functions”
Table 48 on page 74
Table 48 on page 74
Table 48 on page 74
Table 48 on page 74
Table 9 on page 29
Table 9 on page 29
Table 9 on page 29
Table 9 on page 29
2
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