82G33 datasheet(215/437 Pages) INTEL

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PCI Express* Registers (D1:F0)

Datasheet

215

6.1.41

SLOTCAP—Slot Capabilities

B/D/F/Type:

0/1/0/PCI

Address Offset:

B4–B7h

Default Value:

00040000h

Access:

RWO, RO

Size:

32 bits

PCI Express Slot related registers allow for the support of Hot Plug.

Bit

Access &

Default

Description

31:19

RWO

0000h

Physical Slot Number (PSN): Indicates the physical slot number

attached to this Port.

RWO

No Command Completed Support (NCCS):

1 = This slot does not generate software notification when an issued

command is completed by the Hot-Plug Controller. This bit is only

permitted to be set to 1b if the hotplug capable port is able to

accept writes to all fields of the Slot Control register without

delay between successive writes.

Reserved for Electromechanical Interlock Present (EIP):

16:15

RWO

00b

Slot Power Limit Scale (SPLS): 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

RWO

00h

Slot Power Limit Value (SPLV): In combination with the Slot Power

Limit Scale value, 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.

Hot-plug Capable (HPC):

0 = Not Hot-plug capable

1 = Slot is capable of supporting hot-lug operations.

Hot-plug Surprise (HPS):

0 = No Hot-plug surprise

1 = An adapter present in this slot might be removed from the

system without any prior notification. This is a form factor

specific capability. This bit is an indication to the operating

system to allow for such removal without impacting continued

software operation.

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