參數(shù)資料
型號: RG82845
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): 135/157頁
文件大小: 1407K
代理商: RG82845
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
250687-002
Datasheet
79
R
3.7.33.
TOM – Top of Low Memory Register – Device #0
Address Offset:
C4-C5h
Default Value:
0100h
Access:
Read/Write
Size:
16 bits
This register contains the maximum address below 4 GB that should be treated as a memory access. Note
that this register must be set to a value of 0100h (16 MB) or greater. Usually it will sit below the areas
configured for the hub interface, PCI memory, and the graphics aperture.
Bit
Description
15:4
Top of Low Memory (TOM): This register contains the address that corresponds to bits 31 to 20 of
the maximum DRAM memory address that lies below 4 GB. Configuration software should set this
value to either the maximum amount of memory in the system or to the minimum address allocated
for PCI memory or the graphics aperture, whichever is smaller.
Programming example: 400h = 1 GB. An access to 4000_0000h or above will be considered above
the TOM and therefore not routed to DRAM. It may go to AGP, aperture, or subtractively decode to
Hub Interface.
3:0
Reserved
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