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): 93/163頁
文件大小: 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
Datasheet
93
3.7.20.
PMLIMIT—Prefetchable Memory Limit Address Register
(Device 1)
Address Offset:
26-27h
Default Value:
0000h
Access:
Read/Write
Size:
16 bits
This register controls the processor to PCI1 prefetchable memory accesses routing based on the
following formula:
PREFETCHABLE_MEMORY_BASE=< address =<PREFETCHABLE_MEMORY_LIMIT
The upper 12 bits of the register are Read/Write and correspond to the upper 12 address bits A[31:20] of
the 32 bit address. The bottom 4 bits of this register are read-only and return zeroes when read. The
configuration software must initialize this register. For the purpose of address decode, address bits
A[19:0] are assumed to be FFFFFh. Thus, the top of the defined memory address range will be at the top
of a 1MB aligned memory block.
15
4
3
0
Prefetchable Memory Address Limit
Reserved
Bit
Description
15: 4
Prefetchable Memory Address Limit (PMEM_LIMIT).
Corresponds to A[31:20] of the memory address.
Default=0
3:0
Reserved.
Note:
That prefetchable memory range is supported to allow segregation by the configuration software between
the memory ranges that must be defined as UC and the ones that can be designated as a USWC (i.e.
prefetchable) from the processor perspective
.
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