參數(shù)資料
型號: FW82815
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù): 92/172頁
文件大小: 795K
代理商: FW82815
82815 GMCH
R
92
Datasheet
3.5.14.
IOBASE—I/O Base Address Register (Device 1)
Address Offset:
Default Value:
Access:
Size:
1Ch
F0h
Read/Write
8 bits
This register control the processor to PCI1/AGP I/O access routing based on the following formula:
IO_BASE
address
IO_LIMIT
Only the upper 4 bits are programmable. For the purpose of address decode, address bits A[11:0] are
treated as 0. Thus, the bottom of the defined I/O address range will be aligned to a 4-KB boundary.
Note:
BIOS must not set this register to 00h; otherwise, 0CF8h/0CFCh accesses will be forwarded to AGP.
7
4
3
0
I/O Address Base
I/O Addressing Capability
Bit
Description
7:4
I/O Address Base.
Corresponds to A[15:12] of the I/O address. (Default=Fh)
3:0
I/O Addressing Capability.
Hardwired to 0h indicating that only 16 bit I/O addressing is supported. Bits
[31:16] of the I/O base address are assumed to be 0000h.
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