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PI7C8150B
2-PORT PCI-TO-PCI BRIDGE
ADVANCE INFORMATION
Page 64 of 115
July 31, 2003 – Revision 1.031
!
PI7C8150B detects a data parity error on the primary bus or detects S_PERR_L
asserted during the completion phase of a downstream delayed write transaction on the
target (secondary) bus.
Table 6-5. Assertion of P_PERR_L
P_PERR_L
Transaction Type
Direction
Bus Where Error
Was Detected
Primary/
Secondary Parity
Error Response
Bits
x / x
x / x
1 / x
x / x
1 / x
x / x
x / x
x / x
1 / x
1 / 1
x / x
x / x
1 (de-asserted)
1
0 (asserted)
1
0
1
1
1
0
0
2
1
1
X
= don’t care
2
The parity error was detected on the target (secondary) bus but not on the initiator (primary) bus.
Table 6-6 shows assertion of S_PERR_L that is set under the following conditions:
!
PI7C8150B is either the target of a write transaction or the initiator of a read
transaction on the secondary bus.
!
The parity error response bit must be set in the bridge control register of secondary
interface.
!
PI7C8150B detects a data parity error on the secondary bus or detects P_PERR_L
asserted during the completion phase of an upstream delayed write transaction on the
target (primary) bus.
Read
Read
Read
Read
Posted Write
Posted Write
Posted Write
Posted Write
Delayed Write
Delayed Write
Delayed Write
Delayed Write
Downstream
Downstream
Upstream
Upstream
Downstream
Downstream
Upstream
Upstream
Downstream
Downstream
Upstream
Upstream
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary
Table 6-6. Assertion of S_PERR_L
S_PERR_L
Transaction Type
Direction
Bus Where Error
Was Detected
Primary/
Secondary Parity
Error Response
Bits
x / x
x / 1
x / x
x / x
x / x
x / x
x / x
x / 1
x / x
x / x
1 / 1
x / 1
1 (de-asserted)
0 (asserted)
1
1
1
1
1
0
1
1
0
2
0
X
= don’t care
2
The parity error was detected on the target (secondary) bus but not on the initiator (primary) bus.
Table 6-7 shows assertion of P_SERR_L. This signal is set under the following conditions:
Read
Read
Read
Read
Posted Write
Posted Write
Posted Write
Posted Write
Delayed Write
Delayed Write
Delayed Write
Delayed Write
Downstream
Downstream
Upstream
Upstream
Downstream
Downstream
Upstream
Upstream
Downstream
Downstream
Upstream
Upstream
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary
Primary
Secondary