Status And Command (IDE_HOST_STS_CMD) – Offset 4 - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

ID	Date	Version	Classification
834576	10/10/2024	001	Public

Status And Command (IDE_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 Master Abort (RMA) This bit must be set by a master device whenever its transaction (except for Special Cycle) is completed with Unsupported Request Completion Status (a.k.a. Master-Abort).
28	0h	RW/1C/V	Received Target Abort (RTA) This bit must be set by a master 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#. There are three allowable timings for assertion of DEVSEL# as described below: 00b: fast 01b: medium 10b: slow 11b: reserved. Hardwired to 00b.
24	0h	RO	Master 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. Hardwired to 1.
22	0h	RO	Reserved (RSVD3) Reserved (RSVD)
21	1h	RO	66 Mhz Capable (MCAP) This bit indicates whether or not this device is capable of running at 66 MHz. A value of 0 indicates 33 MHz. A value of 1 indicates that the device is 66 MHz capable. Hardwired to 1.
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. A value of zero indicates that no New Capabilities linked list is available. A value of one indicates that the value read at offset 34h is a pointer in Configuration Space to a linked list of new capabilities.
19	0h	RO	Interrupt Status (INTS) This read-only bit reflects the state of the interrupt in the device/function. Only when the Interrupt Disable bit in the command register is a 0 and this Interrupt Status bit is a 1, will the device's/function's INTx# signal be asserted. Setting the Interrupt Disable bit to a 1 has no effect on the state of this bit. Read-only and hardwired to 0 for a device that does NOT support pin-based interrupt.
18:16	0h	RO	Reserved (RSVD2)
15:11	0h	RO	Reserved (RSVD1)
10	0h	RW	Interrupt Disable (INTD) This bit disables the device/function from asserting INTx#. A value of 0 enables the assertion of its INTx# signal. A value of 1 disables the assertion of its INTx# signal. This bit's state after RST# is 0.
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 (RSVD0)
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 Master 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. Devices: When this bit is Set, the PCI device function is allowed to issue Memory or I/O Requests. When this bit is Clear, the PCI device function is not allowed to issue any Memory or I/O Requests. Note that as MSI/MSI-X interrupt Messages are in-band memory writes, setting the Bus Master Enable bit to 0b disables MSI/MSI-X interrupt Messages as well. Requests other than Memory or I/O Requests are not controlled by this bit. Default value of this bit is 0b. This bit is hardwired to 0b if a PCI device function does not generate Memory or I/O Requests. Bridges: This bit controls forwarding of Memory or I/O Requests by a bridge in the Upstream direction. When this bit is 0b, Memory and I/O Requests received at the Downstream side of a bridge must be handled as Unsupported Requests (UR), and for Non-Posted Requests a Completion with UR completion status must be returned. This bit does not affect forwarding of Completions in either the Upstream or Downstream direction. The forwarding of Requests other than Memory or I/O Requests is not controlled by this bit. Default value of this bit is 0b.
1	0h	RO	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 respond to Memory Space accesses. State after RST# is 0. Read-only and hardwired to 0 because IDE does NOT support Memory Space accesses.
0	0h	RW	IO Space Enable (IOSE) Controls a device's response to I/O Space accesses. A value of 0 disables the device response. A value of 1 allows the device to respond to I/O Space accesses. State after reset is 0.