Intel Xeon Wolfdale E3210 P4X-UPE3210-316-6M1333 数据表
产品代码
P4X-UPE3210-316-6M1333
Datasheet
227
Host-Secondary PCI Express* Bridge Registers (D6:F0) (Intel
®
3210 MCH only)
8.18
PMLIMIT1—Prefetchable Memory Limit Address
B/D/F/Type:
0/6/0/PCI
Address Offset: 26–27h
Default Value:
0001h
Access:
RO, RW
Size:
16 bits
This register in conjunction with the corresponding Upper Limit Address register
controls the processor to PCI Express prefetchable memory access routing based on
the following formula:
PREFETCHABLE_MEMORY_BASE ≤ address ≤ PREFETCHABLE_MEMORY_LIMIT
The upper 12 bits of this register are read/write and correspond to address bits
A[31:20] of the 40-bit address. The lower 8 bits of the Upper Limit Address register are
read/write and correspond to address bits A[39:32] of the 40-bit address. This register
must be initialized by the configuration software. 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 1 MB aligned memory block. 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.
Bit
Access
Default
Value
Description
15:4
RW
000h
Prefetchable Memory Address Limit (PMLIMIT): Corresponds to A[31:20]
of the upper limit of the address range passed to PCI Express.
of the upper limit of the address range passed to PCI Express.
3:0
RO
1h
64-bit Address Support: Indicates that the upper 32 bits of the prefetchable
memory region limit address are contained in the Prefetchable Memory Base
Limit Address register at 2Ch
memory region limit address are contained in the Prefetchable Memory Base
Limit Address register at 2Ch