Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
Status And Command (KT_HOST_STS_CMD) – Offset 4
This register contins the PCI status and command registers.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31 | 0h | RO | Detected Parity Error (DPE) Not implemented. Hardwired to 0. |
| 30 | 0h | RO | Signaled System Error (SSE) Not implemented. Hardwired to 0. |
| 29 | 0h | RW/1C/V | Received Inititaor Abort (RMA) This bit must be set by an initiator device whenever its transaction (except for Special Cycle) is completed with Unsupported Request Completion Status (a.k.a. Initiator-Abort). |
| 28 | 0h | RW/1C/V | Received Target Abort (RTA) This bit must be set by an initiator device whenever its transaction is completed with Completer Abort Completion Status (a.k.a. Target-Abort). |
| 27 | 0h | RW/1C/V | Signaled Target Abort (STA) This bit must be set by a target device whenever it completes a Posted or Non-Posted transaction with a Completer Abort (a.k.a. Target-Abort) error. |
| 26:25 | 0h | RO | Devsel Timing (DEVT) These bits encode the timing of DEVSEL#. |
| 24 | 0h | RO | Initiator Data Parity Error (MDPE) Not implemented. Hardwired to 0. |
| 23 | 1h | RO | Fast Back To Back Capable (FBTBC) This bit indicates whether or not the target is capable of accepting fast back-to-back transactions when the transactions are not to the same agent. This bit can be set to 1 if the device can accept these transactions and must be set to 0 otherwise. |
| 22 | 0h | RO | Reserved |
| 21 | 1h | RO | 66 Mhz Capable (MCAP) Hardwired to 1 to indicate the the device is 66 MHz capable |
| 20 | 1h | RO | Capabilities List (CAPL) This optional read-only bit indicates whether or not this device implements the pointer for a New Capabilities linked list at offset 34h. |
| 19 | 0h | RO | Interrupt Status (INTS) Read-only and hardwired to 0 for a device that does NOT support pin-based interrupt. |
| 18:11 | 0h | RO | Reserved |
| 10 | 0h | RW | Interrupt Disable (INTD) This bit disables the device/function from asserting INTx#. A value of |
| 9 | 0h | RO | Fast Back To Back Enable (FBTBEN) Not implemented. Hardwired to 0. |
| 8 | 0h | RO | System Error Enable (SERREN) Not implemented. Hardwired to 0. |
| 7 | 0h | RO | Reserved |
| 6 | 0h | RO | Parity Error Response (PERRR) Not implemented. Hardwired to 0. |
| 5 | 0h | RO | VGA Palette Snoop (VGAPS) Not implemented. Hardwired to 0. |
| 4 | 0h | RO | Memory Write And Invalidate Enable (MWRIEN) Not implemented. Hardwired to 0. |
| 3 | 0h | RO | Special Cycles (SPCYC) Not implemented. Hardwired to 0. |
| 2 | 0h | RW | Bus Initiator Enable (BME) Controls the ability of a PCI device to issue Memory and I/O Read/Write Requests, and the ability of a PCI bridge to forward Memory and I/O Read/Write Requests in the Upstream direction. |
| 1 | 0h | RW | Memory Space Enable (MSE) Controls a device's response to Memory Space accesses. A value of 0 disables the device response. A value of 1 allows the device to |
| 0 | 0h | RW | IO Space Enable (IOSE) Controls a device's response to I/O Space accesses. A value of 0 |