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): 105/163頁
文件大小: 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
Datasheet
105
3.8.14.
MMADR—Memory Mapped Range Address Register (Device 2)
Address Offset:
14
17h
Default Value:
00000000h
Access:
Read/Write, Read Only
This register requests allocation for GMCH2-M registers and instruction ports. The allocation is for 512
KB and the base address is defined by bits [31:19].
31
19
18
16
Memory Base Address
(addr bits [31:19])
Address Mask (HW=0;
512 KB addr range)
15
4
3
2
1
0
Address Mask (cont)
(HW=0; 512 KB addr range)
Prefetch
Mem En
(HW=0)
Memory Type
(HW=0; 32 Mb addr)
Mem/IO
Space
(HW=0)
Bit
Descriptions
31:19
Memory Base Address
[31:19].
Read/Write.
Set by the OS, these bits correspond to address signals
18:4
Address Mask
RO.
Hardwired to 0s to indicate 512 KB address range.
3
Prefetchable Memory
RO.
Hardwired to 0 to prevent prefetching.
2:1
Memory Type
RO.
Hardwired to 0s to indicate 32-bit address.
0
Memory / IO Space
RO.
Hardwired to 0 to indicate memory space.
3.8.15.
SVID—Subsystem Vendor Identification Register (Device 2)
Address Offset:
2C
2Dh
Default Value:
0000h
Access:
Read/Write Once
Bit
Descriptions
15:0
Subsystem Vendor ID (Read/WriteO).
This value is used to identify the vendor of the subsystem.
The default value is 0000h. This field should be programmed by BIOS during boot-up.
Once written, this register becomes Read_Only. This Register can only be cleared by a Reset.
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