910GL datasheet(157/426 Pages) INTEL

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Host-PCI Express* Bridge Registers (D1:F0)

(Intel® 82915G/82915P/82915PL Only)

Datasheet

157

8.1.39

SLOTCAP—Slot Capabilities (D1:F0)

PCI Device:

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.

R/WO

Hot-plug Capable: This field indicates that this slot is capable of supporting

Hot-plug operations.

R/WO

Hot-plug Surprise: This field indicates that a device present in this slot might

be removed from the system without any prior notification.

R/WO

Power Indicator Present: This field indicates that a Power Indicator is

implemented on the chassis for this slot.

R/WO

Attention Indicator Present: This field indicates that an Attention Indicator is

implemented on the chassis for this slot.

2:1

Reserved

R/WO

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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