L1 PM Substates Extended Capability Header Register @0x900
L1 PM Substates Extended Capability Header Register. For a multi-Function device associated with an Endpoint implementing L1 PM Substates, this Extended Capability Structure is implemented only in Function 0, and controls the Endpoint's Link behavior on behalf of all the Functions of the device.
| Bits | SW | Name | Description | Reset |
|---|---|---|---|---|
| 15:0 | R | PCI Express Extended Capability ID [PECID] | This field is hardwired to the Capability ID assigned by PCI SIG to the L1 PM Substates Extended Capability Structure (001E hex). | 0x01e |
| 19:16 | R | Capability Version [CV] | Specifies the SIG assigned value for the version of the capability structure. This field is set by default to 1, but can be modified from the local management bus. | 0x01 |
| 31:20 | R | Next Capability Offset [NCO] | Indicates offset to the next PCI Express capability structure. The default next pointer value is dynamic and is dependent on whether the strap or LMI bits are set. | 12'h910 |