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910GL Datasheet(PDF) 218 Page - Intel Corporation

Part # 910GL
Description  Express Chipset
PDF  426 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

910GL Datasheet(HTML) 218 Page - Intel Corporation

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System Address Map
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218
Datasheet
11.4.3
SMM Space Combinations
When High SMM is enabled, the Compatible SMM space is effectively disabled. Processor
originated accesses to the Compatible SMM space are forwarded to PCI Express if this VGA
capability is enabled; otherwise, they are forwarded to the DMI. PCI Express and DMI originated
accesses are never allowed to access SMM space.
Table 11-5. SMM Space Table
Global Enable
G_SMRAME
High Enable
H_SMRAM_EN
TSEG Enable
TSEG_EN
Compatible
(C) Range
High (H)
Range
TSEG (T)
Range
0
X
X
Disable
Disable
Disable
1
0
0
Enable
Disable
Disable
1
0
1
Enable
Disable
Enable
1
1
0
Disabled
Enable
Disable
1
1
1
Disabled
Enable
Enable
11.4.4
SMM Control Combinations
The G_SMRAME bit provides a global enable for all SMM memory. The D_OPEN bit allows
software to write to the SMM ranges without being in SMM mode. BIOS software can use this bit
to initialize SMM code at powerup. The D_LCK bit limits the SMM range access to only SMM
mode accesses. The D_CLS bit causes SMM data accesses to be forwarded to the DMI or PCI
Express. The SMM software can use this bit to write to video memory while running SMM code
out of DRAM.
Table 11-6. SMM Control Table
G_SMRAME
D_LCK
D_CLS
D_OPEN
Processor in
SMM Mode
SMM Code
Access
SMM Data
Access
0
x
X
x
x
Disable
Disable
1
0
X
0
0
Disable
Disable
1
0
0
0
1
Enable
Enable
1
0
0
1
x
Enable
Enable
1
0
1
0
1
Enable
Disable
1
0
1
1
x
Invalid
Invalid
1
1
X
x
0
Disable
Disable
1
1
0
x
1
Enable
Enable
1
1
1
x
1
Enable
Disable



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