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)： 60/163頁
文件大?。?/td> 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
60
Datasheet
Bit
Description
9
Self-Refresh Disable.
0 = Self-Refresh enabled during C3 state. (Default)
1 = Self-Refresh disabled.
8
Reserved: need to be programmed as ‘0’
7:0
C3 entry delay counter. Adjusts the delay for entering the C3 state.
40h = Optimal setting
3.6.22.
SMRAM - System Management RAM Control Register (Device 0)
Address Offset:
70h
Default Value:
00h
Access:
Read/Write, Read Only
Size:
8 bits
The SMRAM register controls how accesses to Compatible and Extended SMRAM spaces are treated,
and how much (if any) memory is used from the System to support both SMRAM and Graphics Local
Memory needs.
7
6
5
4
3
2
1
0
Graphics Mode Select
Upper SMM Select
Lower SMM Select
SMM
Space
Locked
E_
SMRAM_
ERR
Bit
Description
7:6
Graphics Mode Select (GMS).
This field is used to enable/disable the Internal Graphics device
(GFX) and select the amount of Main Memory that is “Stolen” to support the Internal Graphics device
in VGA (non-linear) mode only. These 2 bits only have meaning if we are not in AGP mode.
00 = Internal Graphics Device Disabled, No memory “Stolen”
01 = Internal Graphics Device Enabled, No memory “Stolen”
10 = Internal Graphics Device Enabled, 512K of memory “Stolen” for frame buffer.
11 = Internal Graphics Device Enabled, 1M of memory “Stolen” for frame buffer.
Note:
When the Internal Graphics Device is Disabled (00) the Graphics Device and all of its
memory and I/O functions are disabled and the clocks to this logic are turned off, memory accesses
to the VGA range (A0000-BFFFF) will be forwarded on to the hub interface, and the Graphics Local
Memory space is NOT “stolen” from main memory. Any change to the SMRAM register will not affect
AGP mode or cause the controller to go into AGP mode.
When this field is non-0 the Internal Graphics Device and all of its memory and I/O functions are
enabled, all non-SMM memory accesses to the VGA range will be handled internally and the
selected amount of Graphics Local Memory space (0, 512K or 1M) is “stolen” from the main
memory. Graphics Memory is “stolen” AFTER TSEG Memory is “stolen”.
Once D_LCK is set, these bits becomes read only. GMCH2-M does not support VGA on local
memory. Software must not use the 01 mode for VGA
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