Intel® Core™ Ultra Series 3 Processors CFG and MEM Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872351 | 04/14/2026 | 001 | Public |
PCIe Device Capability2 (DEVCAPREG2) – Offset 64
PCIE Device Cap Register2
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:24 | 0h | RO | Reserved |
| 23:22 | 0h | RO | Max End2end Tlp Prefix Field (MAX_EE_TLP_PREFIXES) Max End2End TLP Prefixes |
| 21 | 0h | RO | End2end Tlp Prefix Supported Field (EE_TLP_PREFIX_SUPPORT) End2End TLP Prefixes Support |
| 20 | 0h | RO | Ext Format Support Field (EXTD_FMT_SUPPORT) Extended Format Support |
| 19:18 | 0h | RO | Obff Support Field (OBFF_SUPPORT) PCI OBFF Support |
| 17 | 0h | RO | Ten bit requester tag support (TENBIT_REQ_TAG_SUPPORT) If this bit is Set the Function supports 10-Bit Tag Requester capability otherwise the Function does not |
| 16 | 0h | RO | Ten bit completer tag support (TENBIT_CPL_TAG_SUPPORT) If this bit is Set the Function supports 10-Bit Tag Completer capability otherwise the Function does not |
| 15:14 | 0h | RO | Reserved |
| 13:12 | 0h | RO | Tph Completer Supported Field (TPH_CPL_SUPPORT) Tph Completer Support |
| 11 | 0h | RO | Ltr Support Field (LTR_SUPPORT) A value of 1 indicates support for the optional Latency Tolerance Reporting mechanism.If ENABLE_LTR_CAP = 1, then the strap value is ignored and the register bit value will always be 1. |
| 10 | 0h | RO | No Ro Enable Field (NRO_EN_PRPR_PASS) No Ro based PR-PR Passing |
| 9 | 0h | RO | Cas Cpl 128 Support Field (CAS_CPL_SUPPORT_128) Bridge does not support Atomic Operations and thus tied to zero |
| 8 | 0h | RO | Cas Cpl 64 Support Field (ATM_OP_CPL_SUPPORT_64) CAS64 Completion Support |
| 7 | 0h | RO | Cas Cpl 32 Support Field (ATM_OP_CPL_SUPPORT_32) CAS32 Completion Support |
| 6 | 0h | RO | Atomic Operation Routing Field (ATOR_SUPPORT) Atomic Operation Routing Support |
| 5 | 0h | RO | Pci Ari Forwarding Support Field (ARI_FWD_SUPPORT) ARI Forwarding Support |
| 4 | 0h | RO | Cpl Timeout Disable Support Field (CPL_TO_DIS_SUPPORT) Completion Timeout Disable Support |
| 3:0 | 0h | RO | Cpl Timeout Range Support Field (CPL_TO_RNG_SUPPORT) Completion Timeout Ranges Support |