31

0h

RO

Reserved

30

0h

RO/V

(SERR_​STS)

SERR status

29

0h

RW/1C/V

Received Master Abort (RMA)

Set when IUNIT recieve UR.

28

0h

RW/1C/V

Received Target Abort (RTA)

Set when IUNIT recieve CA.

27

0h

RW/1C/V

Signaled Target Abort (STA)

Set when IUNIT recieve P/NP transaction which is CA.

26:21

0h

RO

Reserved

20

1h

RO

Capability List (CAP)

Indicates that the CAPPOINT register at 34h provides an offset into PCI Configuration Space containing a pointer to the location of the first item in the list.

19

0h

RO/V

Interrupt Status (IS)

Reflects the state of the interrupt in the camera device.
Is set to 1 if IER and IIR are both set. Otherwise is set to 0.

18:11

0h

RO

Reserved

10

0h

RW

Interrupt Disable (INTA_​DISABLE)

When 1, blocks the sending of ASSERT_​INTA and DEASSERT_​INTA messages to the Intel Legacy Block (ILB). The interrupt status is not blocked from being reflected in PCICMDSTS.IS.
When 0, permits the sending of ASSERT_​INTA and DEASSERT_​INTA messages to the ILB.

9

0h

RO

Fast Back To Back Enable (FastB2B)

Hardwired to 0.

8

0h

RO

SERR Reporting Enable (SERR_​EN)

SERR Reporting Enable.

7

0h

RO

Reserved

6

0h

RO

Parity Error (Parity_​Err)

Parity Error Reporting Enable.

5

0h

RO

VGA Snoop (VGA_​Snp)

Not applicable to internal IIO devices. Hardwired to 0.

4

0h

RO

Memory Write and Invalidate Enable (MWrInv)

Not applicable to internal IIO devices. Hardwired to 0.

3

0h

RO

Special Cycle (SPECIAL_​CYCLE)

Special Cycle Enable. Hardwired to 0.

2

0h

RW

Bus Master Enable (BME)

Enables ISP to function as a PCI compliant master.
When 0, blocks the sending of MSI interrupts.
When 1, permits the sending of MSI interrupts.

1

0h

RW

Memory Space Enable (MSE)

When set, accesses to this device's memory space is enabled.
When 1, the ISP will compare the incoming address on the IOSF bus with ISPMMADR_​BAR(31:22). If there is a match and if the IOSF command is either a MEMRD or MEMWR, the ISP will select the command and direct it to internally addressed entity.
When 0, the ISP will not claim MEMRD or MEMWR IOSF commands.

0

0h

RO

IO Space Enable (IOAE)

The IPU doesn't support IO commands.