PCI-X Interface
•Target Terminations Initiated by the 41210
The 41210 responds with a retry to
—A memory read transaction occurs and the 41210 delayed transaction queue is full.
—A LOCK transaction is established from PCI
—A memory write transaction occurs and the 41210 has no free buffer space to accept the write.
—A memory write is from a master other than the master that was previously retried (starvation prevention mechanism).
Note: The 41210 never retries a completion since it always has enough buffer space for all split requests it sends out. No transaction information is retained on any writes.
•Disconnect
The 41210 disconnects a transaction on
—The 41210 cannot accept any more write data and an ADB is reached.
—A split completion packet being sent, ADB is reached, and the 41210 read buffers are running dry.
—Inverse decode window ends, and an upstream write is in progress, irrespective of the availability of the
•Target Abort
The 41210 returns a target abort to
—The initial request received a
—All requests with address parity error and the parity error response bit is set.
•Master Abort
—The 41210 master aborts all memory transactions on
—The 41210 returns a master abort response in a split completion when the split cycle master aborted on PCI Express*/peer PCI.
•Split Response
All memory read cycles that cross the 41210 receive this termination, if they are not retried.
Intel® 41210 Serial to Parallel PCI Bridge Developer’s Manual | 33 |