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Bitfields for PCI Configuration Base Address

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Bit Description

0

address type
0 = memory space
1 = I/O space

---memory address---

2-1

address type
00 - anywhere in first 4GB
01 - below 1MB
10 - anywhere in 64-bit address space
11 - reserved

3

prefetchable

31-4

bits 31-4 of base memory address if addressable in first 1MB or 4GB

63-4

bits 63-4 of base memory address if addressable in 64-bit memory
(bits 63-32 are stored in the following base address DWORD)

---I/O address---

1

31-2


See Also:

#00878,#00902