PI7C8150A
2-PORT PCI-TO-PCI BRIDGE
The PI7C8150A must be a master on the secondary bus.
The parity error response bit must be set in the bridge control register of secondary
interface.
The S_PERR_L signal is detected asserted or a parity error is detected on the
secondary bus.
Table 6-4. Setting Secondary Interface Master Data Parity Error Detected Bit
Secondary
Detected Parity
Detected Bit
0
1
0
0
0
1
0
0
0
1
0
0
X= don’t care
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/1
x/x
x/x
x/x
x/1
x/x
x/x
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 6-5 shows assertion of P_PERR_L. This signal is set under the following conditions:
PI7C8150A is either the target of a write transaction or the initiator of a read
transaction on the primary bus.
The parity-error-response bit must be set in the command register of primary interface.
PI7C8150A 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
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
Page 60 of 111
APRIL 2006 – Revision 1.1
06-0057
PERICOM [ PERICOM SEMICONDUCTOR CORPORATION ]
