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IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
2.13
Serial mode LED
When MII/RMII2 is enabled, there are no enough pins for LED and IP175C/IP175CH sends out LED
information through pin 111 SCLK and pin112 SDATA. It is necessary to use TTL chip to decode and
drive LED. The application Icircuit is shown below.
IP175C/IP175CH supports two types of serial led mode and can be setting by PIN112 or MII register
31.5[1]. The default value is 0 (SERIAL_LED_MODE = 0) and can be setting to 1 by pull up PIN112
(4.7K) or writeing 1 to MII register 31.5[1].
(SERIAL_LED_MODE=1, IP175C/IP175CH supports link, speed, and duplex LED)
74HC164
VDD
QA
QB
QC
QD
QE
QF
QG
QH
A
CLK
B
CLR
VDD
74HC164
VDD
QA
QB
QC
QD
QE
QF
QG
QH
A
CLK
B
CLR
VDD
SDATA
SCLK
PORT 0 LINK/ACT LED
PORT 4 LINK/ACT LED
PORT 3 LINK/ACT LED
PORT 2 LINK/ACT LED
PORT 1 LINK/ACT LED
PORT 4 SPEED LED
PORT 0 SPEED LED
PORT 1 SPEED LED
PORT 2 SPEED LED
PORT 3 SPEED LED
PORT 4 DUP/COL LED
PORT 0 DUP/COL LED
PORT 1 DUP/COL LED
PORT 2 DUP/COL LED
PORT 3 DUP/COL LED
Mar 09, 2007
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Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
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