IBM CMX58886CX user manual Multi-Color LED I/O Address 456h, Manual LED Colors

Multi-Color LED

The CMX58886CX has a Multi-Color LED located beside the EIDE connector (CN10) which can be enabled or disabled in the BIOS setup screen. The color of the LED indicates the status of the board, as shown in Table 49.

	Table 49 LED Colors
Color	Description
Green	Normal Operation
Blue	On Board IDE Activity
Red	cpuModule is in reset1
Yellow (Red + Green)	cpuModule is in Standby
White (R+G+B)	cpuModule is approaching thermal limit
	(CPU is throttled if enabled)
Cyan (Blue + Green)	Ethernet Link at 10 Mbps
Magenta (Blue + Red)	Ethernet Link at 100 Mbps
Blink	Ethernet Activity

1.If power is applied to the cpuModule while jumper JP5 is installed, the LED will be red. This does not indicate that the board is in reset

The LED can also be controlled manually by writing to I/O Port 456h, as shown in Table 50 and Table 51.

Table 50 Multi-Color LED I/O Address 456h

D7	D6	D5	D4	D3	D2	D1	D0
User	User	User	Reserved	Reserved		Multi-Color LED
EEPROM	EEPROM	EEPROM

Note When writing to I/O Port 456h, only the lower three bits of the register should be modified.

Modifying the upper bits will effect the User EEPROM

The following table lists the color displayed and the value written.

	Table 51 Manual LED Colors
I/O Port 456h Value	Color
0x00	Automatic (see Table 49)
0x08	Off1
0x09	Blue
0x0A	Green
0x0B	Cyan (Green + Blue)
0x0C	Red
0x0D	Magenta (Red + Blue)
0x0E	Yellow (Red + Green)
0x0F	White (Red + Green + Blue)

1.Disabling the LED will reduce system power consumption.

BDM-610000050 Rev A Chapter 4: Using the cpuModule 69