82870P2P64H2 Datasheet, PDF (87/217 Pages) –

Register Description
R
3.3.2.4
LEDC—LED Control Register
Offset:
04–07h
Default Value: 00h
Attribute:
Size:
R/W
32 bits
This register controls the two LEDs on each slot. There are two bits for each LED control. When
the P64H2 executes an auto power-down, all four LED bits corresponding to that slot will be
cleared. Below is the bit placement per slot. In all cases, the green LED is the power indicator and
the amber LED is the attention indicator.
• 00 = Off
• 01 = Blink Phase A
• 10 = Blink Phase B
• 11 = On
The LEDs are initialized by RSTIN#, not by PCIRST#. Both LEDs for a slot initialize to 0 if slot
is opened or if slot is not supported.
To change the state of an LED for a slot, write the LEDC register with the appropriate setting for
each slot, and then perform a write to SOGO in the MCNF Register in memory space.
Bits
Description
31:30
29:24
23:22
21:16
15:14
13:8
7:6
5:0
Reserved
Amber LED MSB (AMM). MSB of the Amber LED. Bit 29 corresponds to slot F, bit 28 to slot E,
etc. until bit 24, which corresponds to slot A. These bits are R/W only for slots enabled by the
HPx_SLOT[2:0] power on straps. Otherwise, they are RO for the disabled slots.
Reserved
Amber LED LSB (AML). LSB of the Amber LED. Bit 21 corresponds to slot F, bit 20 to slot E,
etc. until bit 16, which corresponds to slot A. These bits are R/W only for slots enabled by the
HPx_SLOT[2:0] power on straps. Otherwise, they are RO for the disabled slots.
Reserved
Green LED MSB (GNM). MSB of the Green LED. Bit 13 corresponds to slot F, bit 12 to slot E,
etc. until bit 8, which corresponds to slot A. These bits are R/W only for slots enabled by the
HPx_SLOT[2:0] power on straps. Otherwise, they are RO for the disabled slots.
Reserved
Green LED LSB (GNL). LSB of the Green LED. Bit 5 corresponds to slot F, bit 4 to slot E, etc.
until bit 0, which corresponds to slot A. These bits are R/W only for slots enabled by the
HPx_SLOT[2:0] power on straps. Otherwise, they are RO for the disabled slots.
Intel^® 82870P2 P64H2 Datasheet
87