IDT Transparent Mode Operation
Generic PCI to PCI Bridge Register Definition
PES12N3 User Manual
9 - 23
June 7, 2006
Notes
PMBASE - Prefetchable Memory Base (0x024)
Bit
Field
Field
Name
Type
Default
Value
Description
3:0
Reserved
RO
0x0
15:4
MBASE
RW
0xFFF
Memory Address Base. The MBASE and MLIMIT regis-
ters are used to control the forwarding of non-prefetchable
transactions between the primary and secondary interfaces
of the bridge. This field contains A[31:20] of the lowest
address aligned on a 1MB boundary that is below the pri-
mary interface of the bridge.
Bit
Field
Field
Name
Type
Default
Value
Description
3:0
Reserved
RO
0x0
15:4
MLIMIT
RW
0x0
Memory Address Limit. The MBASE and MLIMIT regis-
ters are used to control the forwarding of non-prefetchable
transactions between the primary and secondary interfaces
of the bridge. This field contains A[31:20] of the highest
address, with A[19:0] assumed to be 0xF_FFFF, that is
below the primary interface of the bridge.
Bit
Field
Field
Name
Type
Default
Value
Description
0
PMCAP
RWL
0x1
Prefetchable Memory Capability. Indicates if the bridge
supports 32-bit or 64-bit prefetchable memory addressing.
0x0 - (prefmem32) 32-bit prefetchable memory address-
ing.
0x1 - (prefmem64) 64-bit prefetchable memory address-
ing.
3:1
Reserved
RO
0x0
15:4
PMBASE
RW
0xFFF
Prefetchable Memory Address Base. The PMBASE,
PMBASEU, PMLIMIT and PMLIMITU registers are used to
control the forwarding of prefetchable transactions
between the primary and secondary interfaces of the
bridge. This field contains A[31:20] of the lowest memory
address aligned on a 1MB boundary that is below the pri-
mary interface of the bridge. PMBASEU specifies the
remaining bits.
Содержание 89HPES12N3
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