參數(shù)資料
型號: 82815EM
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù): 77/163頁
文件大?。?/td> 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
Datasheet
77
3.6.35.
GMCHCFG—GMCH2-M Configuration Register (Device 0)
Address Offset:
BEh
Default:
0000 X000b
Access:
Read/Write, Read Only
Size:
8 bits
7
6
5
4
3
2
0
Reserved
MDA
Present
(R/W)
Reserved
Bit
Description
7:6
Reserved.
5
MDA Present (MDAP) (Read/Write). This bit should not be set when the VGA Enable bit is not
set
. This bit works with the VGA Enable bit in the BCTRL register (3Eh, bit 3) of device 1 to control
the routing of processor initiated transactions targeting MDA compatible I/O and memory address
ranges. If the VGA enable bit is set, then accesses to IO address range x3BCh - x3BFh are
forwarded to hub interface. If the VGA enable bit is not set then accesses to IO address range x3BCh
- x3BFh are treated just like any other IO accesses
i.e.
the cycles are forwarded to AGP if the
address is within IOBASE and IOLIMIT and ISA enable bit is not set. MDA resources are defined as
the following:
Memory:
I/O:
3B4h, 3B5h, 3B8h, 3B9h, 3BAh, 3BFh, (including ISA address aliases, A[15:10] are not used in
decode). Any I/O reference that includes the I/O locations listed above, or their aliases, will be
forwarded to hub interface even if the reference includes I/O locations not listed above. The following
table shows the behavior for all combinations of MDA and VGA:
0B0000h - 0B7FFFh
VGA MDA Behavior
0 0 All References to MDA and VGA go to hub interface
0 1 Illegal Combination (DO NOT USE)
1 0 All References to VGA go to AGP/PCI. MDA-only references
1 1 VGA References go to AGP/PCI; MDA References go to hub interface
4:0
Reserved.
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