System for limiting access of plurality of requests to periphera

Details System for limiting access of plurality of requests to periphera System for limiting access of plurality of requests to periphera

1995-06-07

1998-05-19

Lee, Thomas C.

395297, 395879, 395557, G06F 1314, G06F 1516

Patent

active

057548870

ABSTRACT:
A method and system are disclosed for managing multiple requests issued by a requester to a number of peripheral devices coupled to a peripheral bus within a data processing system. A request issued by the requestor which specifies a particular operation to be performed is transmitted to a selected peripheral device vice the peripheral bus. In response to performance of the particular operation by the selected peripheral device within a first predetermined time period, successful completion of the request is reported to the requestor. In response to a failure of the selected peripheral device to perform the particular operation within the first predetermined time period, access to the peripheral bus by the multiple requests is limited. Thereafter, in response to a failure of the selected peripheral device to perform the particular operation within a second predetermined time period, a request timeout error is reported to the requester. However, in response to performance of the particular operation by the selected peripheral device within the second predetermined time period, successful completion of the request is reported to the requester. Thus, utilizing the present invention, request timeout errors due to peripheral bus saturation are minimized.

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