Continuous Online Self-Monitoring Introspection Circuitry for
Timing Repair by Incremental Partial-reconfiguration (COSMIC TRIP)
Hans Giesen,
Benjamin Gojman,
Raphael Rubin,
Ji Kim,
and André DeHon
Proceedings of the IEEE
Symposium on Field-Programmable Custom Computing Machines,
(FCCM, May 1--3, 2016)
We show that continuously monitoring on-chip delays at the LUT-to-LUT link
level during operation allows an FPGA to detect and self-adapt to aging and
environmental effects on timing. Using a lightweight (<4% added area)
mechanism for monitoring transition timing, a Difference Detector with
First-Fail Latch, we can estimate the timing margin on circuits and
identify the individual links that have degraded and whose delay is
determining the worst-case circuit delay. Combined with
Choose-Your-own-Adventure precomputed, fine-grained repair alternatives, we
introduce a strategy for rapid, in-system incremental repair of links with
degraded timing. We show that these techniques allow us to respond to a
single aging event in less than 300ms for the toronto20 benchmarks. The
result is a step toward systems where adaptive reconfiguration on the
time-scale of seconds is viable and beneficial.
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