![](http://datasheet.mmic.net.cn/100000/IBM21P100BGC_datasheet_3492192/IBM21P100BGC_59.png)
IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
ppb20_pcix_regs.fm.01
October 15, 2001
Configuration Registers
5.2.4.24 Prefetchable Base Upper 32 Bits Register
This register specifies the base of the prefetchable memory address range bits 63:32 and is used in conjunc-
tion with the prefetchable memory base register, the prefetchable memory limit register, and the prefetchable
limit upper 32 bits register to specify a range of 64-bit addresses supported for prefetchable memory transac-
tions on the PCI bus. Address bits 19:0 are assumed to be x‘0 0000’ for the base address.
5.2.4.25 Prefetchable Limit Upper 32 Bits Register
This register specifies the upper address of the prefetchable memory address range bits 63:32 and is used in
conjunction with the prefetchable memory base register, the prefetchable memory limit register, and the
prefetchable base upper 32 bits register to specify a range of 64-bit addresses supported for prefetchable
memory transactions on the PCI bus. Address bits 19:0 are assumed to be x‘FFFFF’ for the limit address.
Address Offset
x‘28’
Access
See individual fields
Reset Value
x‘0000 0000’
Prefetchable Base Upper 32 Bits
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Bit(s)
Access
FieldNameand Description
31:0
RW
Address bits 63:32 of the base address for the address range of prefetchable memory operations that are
passed from the primary to the secondary PCI bus.
Address Offset
x‘2C’
Access
See individual fields
Reset Value
x‘0000 0000’
Prefetchable Limit Upper 32 Bits
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Bit(s)
Access
Field Name and Description
31:0
RW
Address bits 63:32 of the limit address for the address range of prefetchable memory operations that are
passed from the primary to the secondary PCI bus.