參數(shù)資料
型號(hào)： 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)： 70/144頁
文件大小： 5197K
代理商： IBM21P100BGC
IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
ppb20_operations.fm.01
October 15, 2001
Bus Operation
Page 31 of 144
The bridge forwards Type 1 to Type 0 configuration read or configuration write transactions as delayed trans-
actions in the PCI mode or as split transactions in the PCI-X mode.
3.4.3Type 1 to Type1Forwarding byBridge
Type 1 to Type 1 transaction forwarding provides a means to configure devices when a hierarchical bus
structure containing two or more levels of bridges is used.
When the bridge accepts a Type 1 configuration transaction destined for a PCI/PCI-X bus downstream from
its secondary interface, the bridge forwards the transaction unchanged to the secondary bus. Eventually, this
transaction will be translated to a Type 0 configuration transaction or to a special cycle transaction by a down-
stream bridge.
Downstream Type 1 to Type 1 forwarding occurs when the following conditions are met during the address
phase:
The command on P_C/BE(3:0)# indicates a configuration read or configuration write transaction;
P_AD(1:0) are equal to b‘01’;and
the specified bus number is within the range defined by the secondary bus number register (exclusive)
and the subordinate bus number register (inclusive).
Table 3-5. IDSEL Generation
Device Number
Primary Address P_AD(15:11)
Secondary Address S_AD(31:16)
x’00’
00000
0000 0000 0000 0001
x’01’
00001
0000 0000 0000 0010
x’02’
00010
0000 0000 0000 0100
x’03’
00011
0000 0000 0000 1000
x’04’
00100
0000 0000 0001 0000
x’05’
00101
0000 0000 0010 0000
x’06’
00110
0000 0000 0100 0000
x’07’
00111
0000 0000 1000 0000
x’08’
01000
0000 0001 0000 0000
x’09’
01001
0000 0010 0000 0000
x’0A’
01010
0000 0100 0000 0000
x’0B’
01011
0000 1000 0000 0000
x’0C’
01100
0001 0000 0000 0000
x’0D’
01101
0010 0000 0000 0000
x’0E’
01110
0100 0000 0000 0000
x’0F’
01111
1000 0000 0000 0000
x’10’ -x’1E’
10000 - 11110
0000 0000 0000 0000
x’1F’
11111
0000 0000 0000 0000
or may convert to a special cycle transaction if all crite-
ria are met (see
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