Resizable BAR Extended Capability Header Register @0x180
This register contains the PCI Express Extended Capability ID for the Resizable BAR Capability, its capability version, and the pointer to the next capability structure. This register is enabled only when the Resizable BAR Capability is enabled for the Physical Function by setting the Enable Resizable BAR Capability bit (bit 31) of the associated Physical Function BAR Configuration Register (Section 8.4.2.24). When the Resizable BAR Capability is not enabled, a read from this location returns all zeroes.
| 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 Resizable BAR Capability (0015 hex). | 0x0 |
| 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. | 0x0 |
| 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'h0 |