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IEEE Transactions on VLSI Systems
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One-Cycle Correction of Timing Errors in Pipelines with Standard Clocked Elements

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Abstract

One of the most aggressive uses of dynamic voltage scaling is timing speculation, which in turn requires fast correction of timing errors. The fastest existing error correction technique imposes a one-cycle time penalty only, but it is restricted to two-phase transparent latch-based pipelines. We perform one-cycle error correction by gating only the main latch in each stage of the pipeline that precedes a failed stage. This new method is applicable to widely used clocking elements, such as flip-flops and pulsed latches. Because it prevents inputs arriving at a stage, which is stalled, it can also be used in pipelines with multiple fan-in, fan-out, and looping. Simulations show an energy saving of 8%-12% with a target throughput of 0.9 instructions per cycle, and 15%-18% when the target is 0.8.

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IEEE Transactions on VLSI Systems

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