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Control Scheme for a CGRA

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2 Author(s)
Shami, M.A. ; Sch. of ICT, R. Inst. of Technol., Stockholm, Sweden ; Hemani, A.

Ability to instantiate low cost and agile FSMs that can implement an arbitrary parallelism and combine such FSMs in a chain and in a hierarchy is one of the key differentiating factors between the ASICs and MPSOCs. CGRAs that have been reported in literature, like MPSOCs, also lack this ASIC like ability. The downside of ASICs is their lack of reuse and high engineering cost. We present a CGRA architecture that retains the programmability of CGRA and yet has the ASIC like ability to construct a) arbitrarily parallel data-path/FSM combine, b) chain an arbitrary number of such FSMs and c) create a hierarchy of such chains. We present in detail the architecture of such a control scheme and illustrate its use for an example composed of FFT and FIRs. We quantify the benefits of our approach by benchmarking for energy-delay product against a) ASICs (4.8X worse), b) a state-of-the-art CGRA (4.58X better) and FPGAs (63.95X better).

Published in:

Computer Architecture and High Performance Computing (SBAC-PAD), 2010 22nd International Symposium on

Date of Conference:

27-30 Oct. 2010

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