PI7C8150AMAE Pericom Semiconductor, PI7C8150AMAE Datasheet - Page 53

• Manufacturer Part Number: PI7C8150AMAE
• Description: IC PCI-PCI BRIDGE 2PORT 208-FQFP
• Manufacturer: Pericom Semiconductor

Specifications of PI7C8150AMAE

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 208-FQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

06-0057
6.2
6.2.1
6.2.2
DATA PARITY ERRORS
When forwarding transactions, PI7C8150A attempts to pass the data parity condition from
one interface to the other unchanged, whenever possible, to allow the master and target
devices to handle the error condition.
The following sections describe, for each type of transaction, the sequence of events that
occurs when a parity error is detected and the way in which the parity condition is
forwarded across PI7C8150A.
CONFIGURATION WRITE TRANSACTIONS TO
CONFIGURATION SPACE
When PI7C8150A detects a data parity error during a Type 0 configuration write
transaction to PI7C8150A configuration space, the following events occur:
If the parity error response bit is set in the command register, PI7C8150A asserts
P_TRDY_L and writes the data to the configuration register. PI7C8150A also asserts
P_PERR_L. If the parity error response bit is not set, PI7C8150A does not assert
P_PERR_L.
PI7C8150A sets the detected parity error bit in the status register, regardless of the state of
the parity error response bit.
READ TRANSACTIONS
When PI7C8150A detects a parity error during a read transaction, the target drives data and
data parity, and the initiator checks parity and conditionally asserts PERR_L. For
downstream transactions, when PI7C8150A detects a read data parity error on the
secondary bus, the following events occur:
If the parity error response bit is set in the bridge control register, PI7C8150A does not
claim the transaction with S_DEVSEL_L; this may allow the transaction to terminate
in a master abort. If parity error response bit is not set, PI7C8150A proceeds normally
and accepts transaction if it is directed to or across PI7C8150A.
PI7C8150A sets the detected parity error bit in the secondary status register.
PI7C8150A asserts P_SERR_L and sets signaled system error bit in status register, if
both of the following conditions are met:
PI7C8150A asserts S_PERR_L two cycles following the data transfer, if the secondary
interface parity error response bit is set in the bridge control register.
The SERR_L enable bit is set in the command register.
The parity error response bit is set in the bridge control register.
Page 53 of 111
2-PORT PCI-TO-PCI BRIDGE
APRIL 2006 – Revision 1.1
PI7C8150A