Arbitrating and servicing polychronous data requests in...

Details Arbitrating and servicing polychronous data requests in... Arbitrating and servicing polychronous data requests in...

2006-08-08

2006-08-08

Fleming, Fritz (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S025000, C710S039000

Reexamination Certificate

active

07089336

ABSTRACT:
Systems for servicing the data and memory requirements of system devices. A DMA engine that includes a data reservoir is provided that manages and arbitrates the data requests from the system devices. An arbitration unit is provided that only allows eligible devices to make a data request in any given cycle to ensure that all devices will be serviced within a programmable time period. The data reservoir contains the data buffers for each channel of each device. A memory interface ensures that sufficient data for each channel is present in the data reservoir by making requests to a system's memory based on an analysis of each channel. Based on this analysis, a request is either made to the system's main memory, or the channel waits until it is evaluated again in the future. Each channel is thereby guaranteed a response time.

REFERENCES:
patent: 5894586 (1999-04-01), Marks et al.
patent: 6735639 (2004-05-01), Higuchi

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