参数资料
型号: IBM21P100BGC
元件分类: 总线控制器
英文描述: PCI BUS CONTROLLER, PBGA304
封装: 31 X 31 MM, PLASTIC, BGA-304
文件页数: 95/144页
文件大小: 5197K
代理商: IBM21P100BGC
IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
Configuration Registers
Page 54 of 144
ppb20_pcix_regs.fm.01
October 15, 2001
5.2.4.18 I/O Limit Register
This register specifies the upper address of the I/O address range bits 15:12 and is used in conjunction with
the I/O base register and I/O base upper 16 bits and I/O limit upper 16 bits to specify a range of 32-bit
addresses supported for I/O transactions on the PCI bus. Address bits 11:0 are assumed to be x‘FFF’ for the
limit address. This register also specifies that the bridge supports 32-bit I/O addressing.
Address Offset
x‘1D’
Access
See individual fields
Reset Value
x‘X1’
I/O Limit
Addressing
32-Bit
Addressing
7
6
5
4
3
2
1
0
Bit(s)
Access
Field Name and Description
7:4
RW
I/O Limit Address
Address bits 15:12 of the limit address for the address range of I/O operations that are passed from the primary
to the secondary PCI bus.
3:0
RO
Set to b‘0001’ to indicate that 32-bit I/O addressing is supported.
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