LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 132

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
7.30.2 Yellow and Green Power LED Pins
Note:
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
nSLP_S5
The LEDs require external pull-up to VTR.
The green and yellow LED outputs are controlled by the LED register accessible via the LPC bus. The
GRN_YLW bit controls which output is asserted. In addition, the SDY_BLK bit indicates whether the
selected LED is steady or blinking. The LED register is defined in Chapter 10 Runtime Register Block
Runtime Registers.
These LED outputs are also controlled by the nSLP_S5 sleep input pin. The functionality is shown in the
table below.
The green and yellow LED outputs are powered by VTR.
0
0
0
0
1
1
GRN_LED
YLW_LED
nSLP_S5
NAME
GRN_YLW Bit
INPUTS
SMSC I/O
0
0
1
1
0
0
Figure 7.6 - NHD_LED Circuit
Table 7.23 - LED Truth Table
DATASHEET
OD24
OD24
I
Table 7.22 - LED Pins
BUFFER
SDY_BLK Bit
nHD_LED
Page 132
0
1
0
1
0
1
220 ohms
VTR
VTR
VTR
POWER
WELL
RED
VCC
Green Power LED
Open-Drain Output
Yellow Power LED
Open-Drain Output
Input from South
Bridge for
Transitioning to the S5
Power State
GRN_LED
DESCRIPTION
0
0
0
0
0
0
OUTPUTS
YLW_LED
0.67 Hz
Hi-Z
0
0
0
0
SMSC LPC47M172