參數(shù)資料
型號: FW82815
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): 61/172頁
文件大?。?/td> 795K
代理商: FW82815
82815 GMCH
R
Datasheet
61
Expansion Area (C0000h–DFFFFh)
This 128 KB ISA Expansion region is divided into eight 16 KB 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 GMCH and are subtractively decoded to ISA space. Memory that is disabled is not
remapped.
Extended System BIOS Area (E0000h–EFFFFh)
This 64 KB area is divided into four 16 KB 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 KB 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 GMCH can “shadow” BIOS into the main DRAM. When disabled, this
segment is not remapped.
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