Method for dynamic address coding for memory mapped commands dir

Details Method for dynamic address coding for memory mapped commands dir Method for dynamic address coding for memory mapped commands dir

1996-11-19

1999-01-26

An, Meng-Ai T.

395306, 395287, G06F 1300

Patent

active

058646868

ABSTRACT:
In a data processing system including a system bus supporting memory mapped devices, dynamic response to a memory mapped command is achieved by receiving a status response from each device attached to the system bus and comparing a priority associated with each such status response to a predetermined priority. If a priority associated with the status response from one of the devices equals or exceeds the predetermined priority, indicating that the address in the memory mapped command is acknowledged in some form by that device, the status response from that device is forwarded to all devices attached to the system bus. If no status response received from the devices has an associated priority equalling or exceeding the predetermined priority, the address is acknowledged and the memory mapped command accepted and forwarded to a lower bus. If the memory mapped command is not accepted by the lower bus, dummy data is returned and a machine check is signaled.

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