參數(shù)資料
型號： IBM21P100BGB
元件分類： 總線控制器
英文描述： PCI BUS CONTROLLER, PBGA304
封裝： 31 X 31 MM, HEAT SINK, PLASTIC, BGA-304
文件頁數(shù)： 88/140頁
文件大小： 2032K
代理商： IBM21P100BGB
IBM21P100BGB
IBM 133 PCI-X Bridge R1.1
ppb11_pcix_regs.fm.03
July 9, 2001
Configuration Registers
Page 43 of 131
5.2.4.13 Secondary Bus Number Register
The Secondary Bus Number register is used to record the bus number of the PCI bus segment to which the
secondary interface of the bridge is connected. Configuration software programs the value in this register.
The bridge uses this register to decode Type 1 configuration transactions on the primary interface that must
be converted to Type 0 configuration transactions on the secondary interface. The bridge also uses the
Secondary Bus Number register and the Subordinate Bus Number register to determine when to forward
Type 1 configuration transactions upstream.
5.2.4.14 Subordinate Bus Number Register
The Subordinate Bus Number register is used to record the bus number of the highest numbered PCI bus
segment which is behind (or subordinate to) the bridge. Configuration software programs the value in this
register. The bridge uses this register in conjunction with the Secondary Bus Number register to determine
when to respond to a Type 1 configuration transaction on the primary interface and pass it to the secondary
interface. The bridge also uses the Secondary Bus Number register and the Subordinate Bus Number
register to determine when to forward Type 1 configuration transactions upstream.
Address Offset
x‘19’
Access
Read/Write
Reset Value
x‘00’
Secondary Bus Number
7654
3210
Bit(s)
Access
Field Name and Description
7:0
RW
Software sets this register to the bus number of the bus segment that is attached to the secondary interface of
the bridge.
Address Offset
x‘1A’
Access
Read/Write
Reset Value
x‘00’
Subordinate Bus Number
7654
3210
Bit(s)
Access
Field Name and Description
7:0
RW
Software sets this register to the bus number of the highest numbered bus segment behind (or subordinate to)
the bridge.
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