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High level synthesis of multi-precision data flow graphs

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3 Author(s)
Agrawal, V. ; Supercomput. Educ. & Res. Centre, Indian Inst. of Sci., Bangalore, India ; Pande, A. ; Mehendale, M.M.

A number of DSP algorithms involve linear transforms employing weighted sum computations, where the weights are fixed at design time. Add-shift implementation of such a computation results in a data flow graph that has multiple precision variables and functional units. We explore the potential of precision sensitive approach for the high level synthesis of such multi-precision DFGs. We focus on fixed latency implementation of these DFGs. We present register allocation, functional unit binding and scheduling algorithms to exploit the multi-precision nature of such DFGs for area efficient implementation. The proposed approach is fairly generic and could be applied to multi-precision DFGs involving any type of functional units. Significant improvements of upto 27% have been obtained over the conventional high-level synthesis approach

Published in:

VLSI Design, 2001. Fourteenth International Conference on

Date of Conference:

2001

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