參數(shù)資料
型號(hào)： 82815EM
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)： 49/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
Datasheet
49
Bit
Description
24:4
Hardwired to “0”.
This forces minimum aperture size selected by this register to be 32 MB.
3
Prefetchable (RO).
This bit is hardwired to “1” to identify the Graphics Aperture range as a
prefetchable, i.e.:
There are no side effects on reads, the device returns all bytes on reads regardless of the byte enables,
and the GMCH2-M may merge processor writes into this range without causing errors.
2:1
Type (RO).
These bits determine addressing type and they are hardwired to “00” to indicate that address
range defined by the upper bits of this register can be located anywhere in the 32-bit address space.
0
Memory Space Indicator (RO).
Hardwired to “0” to identify aperture range as a memory range.
3.6.11.
SVID—Subsystem Vendor Identification Register (Device 0)
Address Offset:
2C-2Dh
Default:
0000h
Access:
Read/Write Once
Size:
16 bits
Bit
Description
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.
3.6.12.
SID—Subsystem Identification Register (Device 0)
Address Offset:
2E-2Fh
Default:
0000h
Access:
Read/Write Once
Size:
16 bits
Bit
Description
15:0
Subsystem ID (Read/WriteO).
This value is used to identify a particular 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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