PI7C8148B_06 datasheet(49/94 Pages) PERICOM

49 / 94 page

PI7C8148B

ASYNCHRONOUS 2-PORT

PCI-TO-PCI BRIDGE

Page 49 of 94

APRIL 2006 – Revision 1.05

Bridge asserts P_PERR# two cycles after the data transfer, if the parity error response bit is set in

the command register of primary interface.

Bridge sets the parity error detected bit in the status register of the primary interface.

Bridge captures and forwards the bad parity condition to the secondary bus.

Bridge completes the transaction normally.

Similarly, during upstream posted write transactions, when the bridge responds as a target, it detects a

data parity error on the initiator (secondary) bus, the following events occur:

Bridge asserts S_PERR# two cycles after the data transfer, if the parity error response bit is set in

the bridge control register of the secondary interface.

Bridge sets the parity error detected bit in the status register of the secondary interface.

Bridge captures and forwards the bad parity condition to the primary bus.

Bridge completes the transaction normally.

During downstream write transactions, when a data parity error is reported on the target (secondary) bus

by the target’s assertion of S_PERR#, the following events occur:

Bridge sets the data parity detected bit in the status register of secondary interface, if the parity

error response bit is set in the bridge control register of the secondary interface.

Bridge asserts P_SERR# and sets the signaled system error bit in the status register, if all the

following conditions are met:

The SERR# enable bit is set in the command register.

The posted write parity error bit of P_SERR# event disable register is not set.

The parity error response bit is set in the bridge control register of the secondary interface.

The parity error response bit is set in the command register of the primary interface.

Bridge has not detected the parity error on the primary (initiator) bus which the parity

error is not forwarded from the primary bus to the secondary bus.

During upstream write transactions, when a data parity error is reported on the target (primary) bus by

the target’s assertion of P_PERR#, the following events occur:

Bridge sets the data parity detected bit in the status register, if the parity error response bit is set in

the command register of the primary interface.

Bridge asserts P_SERR# and sets the signaled system error bit in the status register, if all the

following conditions are met:

The SERR# enable bit is set in the command register.

The parity error response bit is set in the bridge control register of the secondary interface.

The parity error response bit is set in the command register of the primary interface.

Bridge has not detected the parity error on the secondary (initiator) bus, which the parity

error is not forwarded from the secondary bus to the primary bus.

Assertion of P_SERR# is used to signal the parity error condition when the initiator does not know that

the error occurred. Because the data has already been delivered with no errors, there is no other way to

signal this information back to the initiator. If the parity error has forwarded from the initiating bus to

the target bus, P_SERR# will not be asserted.

06-0053

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