12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
PCI Command (PCICMD_0_0_0_PCI) – Offset 4
Since Device #0 does not physically reside on PCI_A many of the bits are not implemented.
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
15:10 | 0h | RO | Reserved |
9 | 0x0 | RO | Fast Back To Back Enable (FB2B) Fast Back-to-Back Enable: This bit controls whether or not the master can do fast back-to-back write. Since device 0 is strictly a target this bit is not implemented and is hardwired to 0. Writes to this bit position have no effect. |
8 | 0x0 | RW | SERR Reporting Enable (SERRE) SERR Enable: This bit is a global enable bit for Device 0 SERR messaging. The CPU communicates the SERR condition by sending an SERR message over DMI to the PCH. |
7 | 0x0 | RO | Address/Data Stepping (ADSTEP) Address/Data Stepping Enable: Address/data stepping is not implemented in the CPU, and this bit is hardwired to 0. Writes to this bit position have no effect. |
6 | 0x0 | RW | Parity Error Response Enable (PERRE) OPI - N/A Parity Error Enable: Controls whether or not the Master Data Parity Error bit in the PCI Status register can bet set. |
5 | 0x0 | RO | Video Palette Snooping (VGASNOOP) VGA Palette Snoop Enable: The CPU does not implement this bit and it is hardwired to a 0. Writes to this bit position have no effect. |
4 | 0x0 | RO | Memory Write and Invalidate Enable (MWIE) Memory Write and Invalidate Enable: The CPU will never issue memory write and invalidate commands. This bit is therefore hardwired to 0. Writes to this bit position will have no effect. |
3 | 0x0 | RO | Special Cycle Enable (SCE) Reserved per PCI-Express and PCI bridge spec. |
2 | 0x1 | RO | Bus Master Enable (BME) Bus Master Enable: The CPU is always enabled as a master on the backbone. This bit is hardwired to a 1. Writes to this bit position have no effect. |
1 | 0x1 | RO | Memory Access Enable (MAE) Memory Access Enable: The CPU always allows access to main memory, except when such access would violate security principles. Such exceptions are outside the scope of PCI control. This bit is not implemented and is hardwired to 1. Writes to this bit position have no effect. |
0 | 0x0 | RO | I/O Access Enable (IOAE) I/O Access Enable: This bit is not implemented in the CPU and is hardwired to a 0. Writes to this bit position have no effect. |