Processor Configuration Registers
Intel
®
Core
TM
i7-620LE/UE, i7-610E, i5-520E and Intel
®
Celeron
®
Processor P4500, P4505 Series
Datasheet Addendum
April 2010
100
Document Number: 323178-002
6.2.20
PMLIMITU6 - Prefetchable Memory Limit Address Upper
B/D/F/Type:
0/6/0/PCI
Address Offset:
2C-2Fh
Default Value:
00000000h
Access:
RW
Size:
32 bits
The functionality associated with this register is present in the PEG design
implementation.
This register in conjunction with the corresponding Upper Limit Address register
controls the CPU to PCI Express-G 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 is 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 CPU perspective.
Table 43. PMLIMITU6 - Prefetchable Memory Limit Address Upper Register
Bit
Access
Default
Value
RST/
PWR
Description
31:0
RW
00000000h
Core
Prefetchable Memory Address Limit (MLIMITU)
Corresponds to A[63:32] of the upper limit of the prefetchable
Memory range that is passed to PCI Express-G.
