Host-PCI Express* Graphics Bridge Registers (D1:F0)
R
Intel
®
82925X/82925XE MCH Datasheet 141
8.1.39 SLOTCAP—Slot Capabilities (D1:F0)
PCI Device: 1
Address Offset: B4h
Default Value: 00000000h
Access: R/WO
Size: 32 bits
PCI Express slot-related registers allow for the support of Hot-Plug.
Bit Access &
Default
Description
31:19 R/WO
0000h
Physical Slot Number: This field indicates the physical slot number attached to
this Port.
This field must be initialized by BIOS to a value that assigns a slot number that
is globally unique within the chassis.
18:17
Reserved
16:15 R/WO
00b
Slot Power Limit Scale: This field specifies the scale used for the Slot Power
Limit Value.
00 = 1.0x
01 = 0.1x
10 = 0.01x
11 = 0.001x
If this field is written, the link sends a Set_Slot_Power_Limit message.
14:7 R/WO
00h
Slot Power Limit Value: In combination with the Slot Power Limit Scale value,
this field specifies the upper limit on power supplied by slot. Power limit (in
Watts) is calculated by multiplying the value in this field by the value in the Slot
Power Limit Scale field.
If this field is written, the link sends a Set_Slot_Power_Limit message.
6 R/WO
0b
Hot-plug Capable: This field indicates that this slot is capable of supporting
Hot-plug operations.
5 R/WO
0b
Hot-plug Surprise: This field indicates that a device present in this slot might
be removed from the system without any prior notification.
4 R/WO
0b
Power Indicator Present: This field indicates that a Power Indicator is
implemented on the chassis for this slot.
3 R/WO
0b
Attention Indicator Present: This field indicates that an Attention Indicator is
implemented on the chassis for this slot.
2:1 Reserved
0 R/WO
0b
Attention Button Present: This field indicates that an Attention Button is
implemented on the chassis for this slot. The Attention Button allows the user to
request hot-plug operations.
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