PCI Express* Registers (D1:F0)
6.1.41
SLOTCAP—Slot Capabilities
B/D/F/Type:
Address Offset:
Default Value:
Access:
0/1/0/PCI
B4–B7h
00040000h
RWO, RO
32 bits
Size:
PCI Express Slot related registers allow for the support of Hot Plug.
Bit
31:19
18
Access &
Default
Description
RWO
0000h
Physical Slot Number (PSN): Indicates the physical slot number
attached to this Port.
RWO
1b
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.
17
RO
0b
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.
6
5
RO
0b
Hot-plug Capable (HPC):
0 = Not Hot-plug capable
1 = Slot is capable of supporting hot-lug operations.
Hot-plug Surprise (HPS):
RO
0b
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.
Datasheet
197
INTEL [ INTEL ]
