Asynchronous Multirate Real-Time Scheduling for Programmable DSPs


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A    No.1    pp.241-247
Publication Date: 2002/01/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: VLSI Design Technology and CAD
digital signal processor (DSP),  multirate signal processing,  asynchronous,  scheduling,  

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A novel scheduling method for asynchronous multirate/multi-task processing by programmable digital signal processors (DSPs) has been developed. This mixed scheduling method combines static and dynamic scheduling, and avoids runtime overheads due to interrupts in context switching to realizes asynchronous multirate systems. The processing delay introduced when using static scheduling with static buffering is avoided by introducing deadline scheduling in the static schedule design. In the developed software design system, a block-diagram description language is extended to describe asynchronous multi-task processing. The scheduling method enables asynchronous multirate processing, such as arbitrary-sampling-ratio rate conversion, asynchronous interface, and multimedia applications, to be efficiently realized by programmable DSPs.

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