82801FB Datasheet, PDF (683/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

PCI Express* Configuration Registers
19.1.13
IOBL—I/O Base and Limit Register
(PCI Express—D28:F0/F1/F2/F3)
Address Offset: 1C–1Dh
Default Value: 0000h
Attribute:
Size:
R/W, RO
16 bits
Bit
Description
15:12
11:8
7:4
3:0
I/O Limit Address (IOLA) — R/W. I/O Base bits corresponding to address lines 15:12 for 4-KB
alignment. Bits 11:0 are assumed to be padded to FFFh.
I/O Limit Address Capability (IOLC) — R/O. Indicates that the bridge does not support 32-bit I/O
addressing.
I/O Base Address (IOBA) — R/W. I/O Base bits corresponding to address lines 15:12 for 4-KB
alignment. Bits 11:0 are assumed to be padded to 000h.
I/O Base Address Capability (IOBC) — R/O. Indicates that the bridge does not support 32-bit I/O
addressing.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
683