PCI Express* Configuration Registers
778 Datasheet
19.1.31 SLCAP—Slot Capabilities Register
(PCI Express*—D28:F0/F1/F2/F3/F4/F5/F6/F7)
Address Offset: 54h–57h Attribute: R/WO, RO
Default Value: 00040060h Size: 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. Specifies the scale used for the slot power
limit value. BIOS sets this field and it remains set until a platform reset.
14:7
Slot Power Limit Value (SLV) — R/WO. 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. BIOS sets this field and it
remains set until a platform reset.
6
Hot Plug Capable (HPC) — R/WO.
1b = Indicates that Hot-Plug is supported.
5
Hot Plug Surprise (HPS) — R/WO.
1b = Indicates the device may be removed from the slot without prior notification.
4
Power Indicator Present (PIP) — RO.
0b = Indicates that a power indicator LED is not present for this slot.
3
Attention Indicator Present (AIP) — RO.
0b = Indicates that an attention indicator LED is not present for this slot.
2
MRL Sensor Present (MSP) — RO.
0b = Indicates that an MRL sensor is not present.
1
Power Controller Present (PCP) — RO.
0b = Indicates that a power controller is not implemented for this slot.
0
Attention Button Present (ABP) — RO.
0b = Indicates that an attention button is not implemented for this slot.
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