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)： 59/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
Datasheet
59
Expansion Area (C0000h-DFFFFh)
This 128 KByte ISA Expansion region is divided into eight 16 KByte segments. Each segment can be
assigned one of four Read/Write states: read-only, write-only, Read/Write, or disabled. Typically, these
blocks are mapped through GMCH2-M and are subtractively decoded to ISA space. Memory that is
disabled is not remapped.
Note:
That GMCH2-M has support for more PAM regions than Intel
810 chipset.
Extended System BIOS Area (E0000h-EFFFFh)
This 64 KByte area is divided into four 16 KByte segments. Each segment can be assigned independent
read and write attributes so it can be mapped either to main DRAM or to the hub interface. Typically,
this area is used for RAM or ROM. Memory segments that are disabled are not remapped elsewhere.
System BIOS Area (F0000h-FFFFFh)
This area is a single 64 KByte segment. This segment can be assigned read and write attributes. It is by
default (after reset) Read/Write disabled and cycles are forwarded to the hub interface. By manipulating
the Read/Write attributes, the GMCH2-M can “shadow” BIOS into the main DRAM. When disabled,
this segment is not remapped.
3.6.21.
C3STATUS —C3 Control and Status Register (Device #0)
Address Offset:
60h
Default Value:
(see table)
Access:
Read/Write (some bits Read Only)
Size:
32 bits
31
17
16
Reserved
SDRAM
Power
Down
15
11
10
9
8
7
0
Reserved
AGPBUSY
Active
Self Ref
Disable
Reserved
C3 Entry Delay Counter
Bit
Description
31:17
Reserved
16
SDRAM Power Down Feature
0 = SDRAM allowed to enter power down via CKE#
1 = SDRAM not allowed to enter power down (Default)
15:11
Reserved
10
Force AGPBUSY# active.
0 = AGPBUSY# operates normally (Default)
1 = AGPBUSY# asserted (low) continuously.
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