31:24

0h

RW

Base Address (BASE_​ADDR)

Set by the OS, these bits correspond to address signals (31:24).
The ISP will compare the IOSF address (38:24) with {ISPMMADR_​BAR_​HI(6:0), ISPMMADR_​BAR_​LO(31:24)}.
If there is a match, and PCICMDSTS(1) = MSE = 1 and the IOSF command is either a MEMRD or MEMWR, the ISP will select the command and direct it to internally addressed entity.

23:4

0h

RO

Address Mask (ADDR_​MASK)

Hardwired to 0s to indicate at least 16MB address range.

3

0h

RO

Prefetchable Memory (PREFETCHABLE)

Hardwired to 0 to prevent prefetching.

2:1

2h

RO

Memory Type (TYPE)

2h indicates 64 bit wide addressing.

0

0h

RO

Message Space (MESSAGE_​SPACE)

0h indicates memory space.