12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
| ID | Date | Version | Classification |
|---|---|---|---|
| 767625 | 07/13/2023 | Public |
MSI Capabilities and MSI Control (MSI_CAPID) – Offset AC
MSI Capabilities and MSI Control Register
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:24 | 0h | RO | Reserved |
| 23 | 0x1 | RO | 64-bit Address Capable (AC64) 64-bit Address Capable (C64): PCIe devices must support 64b MSI addressing. |
| 22:20 | 0x0 | RW | Multiple Message Enable (MME) Multiple Message Enable (MME): This field is RW for software compatibility, but only a single message is ever generated. |
| 19:17 | 0x0 | RO | Multiple Message Capable (MMC) 3'h0 indicates one outstanding message is supported |
| 16 | 0x0 | RW | MSI Enable (MSIEN) If set, MSI is enabled. PCICMDSTS.BME must be set for an MSI to be generated. When 0, blocks the sending of a MSI interrupt. The interrupt status is not blocked from being reflected in the PCICMDSTS.IS bit. When 1, permits sending of a MSI interrupt. |
| 15:8 | 0xD0 | RO | Next Capability Pointer (NEXT_PTR) This contains a pointer to the next item in the capabilities list which is the Power Management capability |
| 7:0 | 0x5 | RO | MSI Capability (CAPABILITY_ID) Indicates an MSI capability. |