PI7C8150BMA-33 datasheet(39/107 Pages) PERICOM

39 / 107 page

PI7C8150B

ASYNCHRONOUS 2-PORT PCI-TO-PCI BRIDGE

Page 39 of 107

April 2015 – Revision 2.1



The transaction is being entered into the delayed transaction queue.



The read request has already been queued, but read data is not yet available.



Data has been read from target, but it is not yet at head of the read data queue or a

posted write transaction precedes it.



The delayed transaction queue is full, and the transaction cannot be queued.



A delayed read request with the same address and bus command has already been

queued.



A locked sequence is being propagated across PI7C8150B, and the read transaction is

not a locked transaction.



PI7C78150B is currently discarding previously pre-fetched read data.



The target bus is locked and the write transaction is a locked transaction.



Use more than 16 clocks to accept this transaction.

For posted write transactions:



The posted write data buffer does not have enough space for address and at least one

DWORD of write data.



A locked sequence is being propagated across PI7C8150B, and the write transaction is

not a locked transaction.



When a target retry is returned to the initiator of a delayed transaction, the initiator

must repeat the transaction with the same address and bus command as well as the data

if it is a write transaction, within the time frame specified by the master timeout value.

Otherwise, the transaction is discarded from the buffers.

3.8.4.2

TARGET DISCONNECT

PI7C8150B returns a target disconnect to an initiator when one of the following conditions

is met:



PI7C8150B hits an internal address boundary.



PI7C8150B cannot accept any more write data.



PI7C8150B has no more read data to deliver.

See Section 3.5.4 for a description of write address boundaries, and Section 3.6.3 for a

description of read address boundaries.

3.8.4.3

TARGET ABORT

PI7C8150B returns a target abort to an initiator when one of the following conditions is

met:

15-0048

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