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): 104/163頁
文件大?。?/td> 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
104
Datasheet
3.8.13.
GMADR-Graphics Memory Range Address Register (Device 2)
Address Offset:
10
13h
Default Value:
00000008h
Access:
Read/Write, Read Only
This register requests allocation for internal Graphics memory. The allocation is for either 32 MB or 64
MB of memory space (selected by bit 0 of the Device 0 MISCC Reg) and the base address is defined by
bits [31:25,24].
31
26
25
24
16
Memory Base Address
64 MB
Addr. Mask
Address Mask
(HW=0; 32MB addr range)
15
4
3
2
1
0
Address Mask (cont)
(HW=0; 32MB addr range)
Prefetch
Mem En
(HW=1)
Memory Type
(HW=0; 32MB addr)
Mem/IO
Space
(HW=0)
Bit
Descriptions
31:26
Memory Base Address
[31:26].
Read/Write.
Set by the OS, these bits correspond to address signals
25
64 MB Address Mask
RO , Read/Write.
If Device 0 MISCC Reg bit 0 = 0, then this bit is RO with a value of 0, indicating a memory range of
64 MB.
If Device 0 MISCC Reg bit 0 = 1, then this bit is Read/Write, indicating a memory range of 32 MB.
24:4
Address Mask
RO.
Hardwired to 0s to indicate 32 MB address range.
3
Prefetchable Memory
RO.
Hardwired to 1 to enable prefetching.
2:1
Memory Type
RO.
Hardwired to 0 to indicate 32-bit address.
0
Memory/IO Space
RO.
Hardwired to 0 to indicate memory space.
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