參數(shù)資料
型號: IBM21P100BGC
元件分類: 總線控制器
英文描述: PCI BUS CONTROLLER, PBGA304
封裝: 31 X 31 MM, PLASTIC, BGA-304
文件頁數(shù): 122/144頁
文件大?。?/td> 5197K
代理商: IBM21P100BGC
IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
ppb20_pcix_regs.fm.01
October 15, 2001
Configuration Registers
Page 79 of 144
5.2.5.12 Opaque Memory Enable Register
This register enables the opaque memory base, opaque memory limit, opaque memory base upper 32 bits,
and the opaque memory limit upper 32 bits registers. These registers specify a range of 64-bit memory
addresses that are used exclusively on the secondary PCI bus and are not to be accepted by the bridge on
either the primary or secondary interfaces.
Address Offset
x‘70’
Access
Read/Write
Reset Value
x‘00’
When OPAQUE_EN (pin AA18) is tied low. See
details of strapping considerations.
Reset Value
x‘01’
When OPAQUE_EN (pin AA18) is tied high. See
for details of strapping considerations.
Re
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e
rv
e
d
O
p
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M
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E
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ab
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7
6
5
4
3
2
1
0
Bit(s)
Access
Field Name and Description
7:1
RO
Reserved
0
RW
Opaque Memory Enable
0
Disable the opaque memory address range.
1
Enable the opaque memory address range.
This bit is reset according to the tie value of module pin AA18, OPAQUE_EN.
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