307013-003 Datasheet, PDF (684/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

PCI Express* Configuration Registers (Desktop and Mobile Only)
18.1.30 SLCAP—Slot Capabilities Register
(PCI Express—D28:F0/F1/F2/F3/F4/F5)
Address Offset: 54h–57h
Default Value: 00000060h
Attribute:
Size:
R/WO, RO
32 bits
Bit
Description
31:19
Physical Slot Number (PSN) — R/WO. This is a value that is unique to the slot
number. BIOS sets this field and it remains set until a platform reset.
18:17 Reserved
16:15
Slot Power Limit Scale (SLS) — R/WO. This field specifies the scale used for the slot
power limit value. BIOS sets this field and it remains set until a platform reset.
Range of Values:
00b = 1.0 x
01b = 0.1 x
10b = 0.01 x
11b = 0.001 x
14:7
Slot Power Limit Value (SLV) — R/WO. This field specifies the upper limit (in
conjunction with SLS value), on the upper limit on power supplied by the slot. The two
values together indicate the amount of power in watts allowed for the slot. Power limit
(in Watts) is calculated by multiplying the value in this field by the value in the Slot
Power Limit Scale field. BIOS sets this field and it remains set until a platform reset.
Hot Plug Capable (HPC) — RO.
6
1b = Hot-Plug is supported.
Hot Plug Surprise (HPS) — RO.
5
1b = Device may be removed from the slot without prior notification.
Power Indicator Present (PIP) — RO.
4
0b = Power indicator LED is not present for this slot.
Attention Indicator Present (AIP) — RO.
3
0b = Attention indicator LED is not present for this slot.
MRL Sensor Present (MSP) — RO.
2
0b = MRL sensor is not present.
Power Controller Present (PCP) — RO.
1
0b = Power controller is not implemented for this slot.
Attention Button Present (ABP) — RO.
0
0b =Attention button is not implemented for this slot.
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Intel ^® ICH7 Family Datasheet