Implementation and evaluation of configuration scrubbing on CGRAs : A case study

• This paper investigates the overhead imposed by various configuration scrubbing techniques used in fault-tolerant Coarse Grained Reconfigurable Arrays (CGRAs). Today, reconfigurable architectures host large configuration memories. As we progress further in the nanometer regime, these configuration memories have become increasingly susceptible to single event upsets caused e.g. by cosmic radiation. Configuration scrubbing is a frequently used technique to protect these configuration memories against single event upsets. Existing works on configuration scrubbing deal only with FPGA without any reference to the CGRAs (in which configuration memories consume up to 50% of silicon area). Moreover, in the known literature lacks a comprehensive comparison of various configuration scrubbing techniques to guide system designers about the merits/demerits of different scrubbing methods which could be applied to CGRAs. To address these problems, in this paper we classify various configuration scrubbing techniques and quantify their trade-offs when implemented on a CGRA. Synthesis results reveal that scrubbing logic incurs negligible silicon overhead (up to 3% of the area of computational units). Simulation results obtained for a few algorithms/applications (FFT, FIR, matrix multiplication, and WLAN) show that the choice of the configuration scrubbing scheme (external vs. internal) has significant impact on both the size of configuration memory and the number of reconfiguration cycles (respectively 20-80% more and up to 38 times more for the former).

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Application specific integrated circuits

Electric network analysis

Field programmable gate arrays (FPGA)

Programmable logic controllers

Radiation hardening

Reconfigurable architectures

Silicon

Coarse-grained reconfigurable arrays

Comprehensive comparisons

Computational units

Configuration memory

MAtrix multiplication

Reconfiguration cycles

Scrubbing techniques

Single event upsets

Computer control systems

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)