82443BX Datasheet, PDF (81/132 Pages) Intel Corporation – Host Bridge/Controller

Register Description
3.4.15
IOLIMIT—I/O Limit Address Register (Device 1)
Address Offset:
Default Value:
Access:
Size:
1Dh
00h
Read/Write
8 bits
This register controls the CPU to AGP I/O access routing based on the following formula:
IO_BASE=< address =<IO_LIMIT
Bit
Description
7:4 I/O Address Limit. Corresponds to A[15:12] of the I/O address. Default=0
3:0 Reserved. (Only 16 bit addressing supported.)
82443BX Host Bridge Datasheet
3-55