PI7C8150BMA-33 datasheet(33/107 Pages) PERICOM

33 / 107 page

PI7C8150B

ASYNCHRONOUS 2-PORT PCI-TO-PCI BRIDGE

Page 33 of 107

April 2015 – Revision 2.1

to Type 1 forwarding occurs when the following conditions are met during the address

phase:



The lowest two address bits are equal to 01b.



The bus number falls in the range defined by the lower limit (exclusive) in the

secondary bus number register and the upper limit (inclusive) in the subordinate bus

number register.



The bus command is a configuration read or write transaction.

PI7C8150B also supports Type 1 to Type 1 forwarding of configuration write transactions

upstream to support upstream special cycle generation. A Type 1 configuration command

is forwarded upstream when the following conditions

are met:



The lowest two address bits are equal to 01b.



The bus number falls outside the range defined by the lower limit (inclusive) in the

secondary bus number register and the upper limit (inclusive) in the subordinate bus

number register.



The device number in address bits AD[15:11] is equal to 11111b.



The function number in address bits AD[10:8] is equal to 111b.



The bus command is a configuration write transaction.

The PI7C8150B forwards Type 1 to Type 1 configuration write transactions as delayed

transactions. Type 1 to Type 1 configuration write transactions are limited to a single data

transfer.

3.7.4

SPECIAL CYCLES

The Type 1 configuration mechanism is used to generate special cycle transactions in

hierarchical PCI systems. Special cycle transactions are ignored by acting as a target and

are not forwarded across the bridge. Special cycle transactions can be generated from Type

1 configuration write transactions in either the upstream or the down-stream direction.

PI7C8150B initiates a special cycle on the target bus when a Type 1 configuration write

transaction is being detected on the initiating bus and the following conditions are met

during the address phase:



The lowest two address bits on AD[1:0] are equal to 01b.



The device number in address bits AD[15:11] is equal to 11111b.



The function number in address bits AD[10:8] is equal to 111b.



The register number in address bits AD[7:2] is equal to 000000b.



The bus number is equal to the value in the secondary bus number register in

configuration space for downstream forwarding or equal to the value in the primary

bus number register in configuration space for upstream forwarding.

15-0048

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