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): 73/163頁
文件大小: 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
Datasheet
73
3.6.31.
APSIZE—Aperture Size (Device 0)
Address Offset:
Default Value:
Access:
Size:
B4h
00h
Read/Write
8 bits
This register determines the effective size of the Graphics Aperture used for a particular GMCH2-M
configuration. This register can be updated by the GMCH2-M-specific BIOS configuration sequence
before the PCI standard bus enumeration sequence takes place. If the register is not updated then a
default value will select an aperture of maximum size (i.e. 64 MB). (AGP mode only.)
7
4
3
2
0
Reserved
GFX
Aperture
Size
Reserved
Bit
Description
7:4
Reserved.
3
Graphics Aperture Size.
Bit 3 operates on bit 25 of the Aperture Base (APBASE) configuration
register. When this bit is a “0” it forces bit 25 in APBASE to behave as “hardwired” to 0. When this bit is
a “1” it forces bit 25 in APBASE to be Read/Write accessible. Only the following combinations are
allowed:
0 = 64 MB Aperture Size
1 = 32 MB Aperture Size
Default for APSIZE[3]=0b forces default APBASE[25] =0b (responds as “hardwired” to 0). This provides
maximum aperture size of 64 MB. Programming APSIZE[3]=1b enables APBASE[25] as Read/Write
programmable.
2:0
Reserved.
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