Datasheet

Processor Configuration Registers
320 Datasheet, Volume 2
2.19.41 SLOTCAP—Slot Capabilities Register
Note: Hot Plug is not supported on the platform.
3:0 RO 0h
Current Link Speed (CLS)
This field indicates the negotiated Link speed of the given PCI Express Link.
Defined encodings are:
0001b = 2.5 GT/s PCI Express Link
0010b = 5.0 GT/s PCI Express Link
All other encodings are reserved. The value in this field is undefined when the
Link is not up
B/D/F/Type: 0/6/0/PCI
Address Offset: B4–B7h
Reset Value: 00040000h
Access: RW-O, RO
Bit Attr
Reset
Value
Description
31:19 RW-O 0000h
Physical Slot Number (PSN)
This field indicates the physical slot number attached to this Port.
BIOS Requirement: This field must be initialized by BIOS to a value that
assigns a slot number that is globally unique within the chassis.
18 RW-O 1b
No Command Completed Support (NCCS)
When set to 1, this bit indicates that 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)
When set to 1, this bit indicates that an Electromechanical Interlock is
implemented on the chassis for this slot.
16:15 RW-O 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 RW-O 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.
6RO 0b
Reserved for Hot-plug Capable (HPC)
When set to 1, this bit indicates that this slot is capable of supporting hot-lug
operations.
B/D/F/Type: 0/6/0/PCI
Address Offset: B2–B3h
Reset Value: 1000h
Access: RO, RW1C
Bit Attr
Reset
Value
Description