12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
| ID | Date | Version | Classification |
|---|---|---|---|
| 767625 | 07/13/2023 | Public |
Bridge Control (BCTRL) – Offset 3E
Bridge Control
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 15:12 | 0x0 | RO | Reserved (RSVD_M) Reserved. |
| 11 | 0x0 | RW/V2 | Discard Timer SERR# Enable (DTSE) This field is reserved per PCI-Express spec. |
| 10 | 0x0 | RO | Discard Timer Status (DTS) This field is reserved per PCI-Express spec. |
| 9 | 0x0 | RW/V2 | Secondary Discard Timer (SDT) This field is reserved per PCI-Express spec. |
| 8 | 0x0 | RW/V2 | Primary Discard Timer (PDT) This field is reserved per PCI-Express spec. |
| 7 | 0x0 | RO | Fast Back to Back Enable (FBE) This field is reserved per PCI-Express spec. |
| 6 | 0x0 | RW | Secondary Bus Reset (SBR) Triggers a Hot Reset on the PCI-Express port. |
| 5 | 0x0 | RW/V2 | Master Abort Mode (MAM) This field is reserved per PCI-Express spec. |
| 4 | 0x0 | RW | VGA 16-Bit Decode (V16) When set, indicates that the I/O aliases of the VGA range (see BCTRL:VE definition below), are not enabled. |
| 3 | 0x0 | RW | VGA Enable (VE) When set, the following ranges will be claimed off the backbone by the root port: |
| 2 | 0x0 | RW | ISA Enable (IE) This bit only applies to I/O addresses that are enabled by the I/O Base and I/O Limit registers and are in the first 64KB of PCI I/O space. If this bit is set, the root port will block any forwarding from the backbone to the device of I/O transactions addressing the last 768 bytes in each 1KB block (offsets 100h to 3FFh). |
| 1 | 0x0 | RW | SERR# Enable (SE) When set, ERR_COR, ERR_NONFATAL, and ERR_FATAL messages received are forwarded to the backbone. When cleared, they are not. |
| 0 | 0x0 | RW | Parity Error Response Enable (PERE) When set, poisoned write TLPs and completions indicating poisoned TLPs will set the SSTS.DPD. |