Pitfalls and Tradeoffs in Simultaneous, On-Chip FPGA Delay Measurement
Pitfalls and Tradeoffs in Simultaneous, On-Chip FPGA Delay Measurement
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同步片上 FPGA 延迟测量的陷阱和权衡
DOI:
10.1145/2847263.2847334
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
DeHon, Andre
中科院分区:
文献类型:
--
作者:
Linscott, Timothy A.;Gojman, Benjamin;Rubin, Raphael;DeHon, Andre
Recent work shows how to use on-chip structures to measure the fabricated delays of fine-grained resources on modern FPGAs. We show that simultaneous measurement of multiple, disjoint paths will result in different measured delays from isolated configurations that measure a single path. On the Cyclone III, we show differences as large as +/-33ps on 2ns-long paths, even if the simultaneously configured logic is not active. This is over 20x the measurement precision used on these devices and over 50% of the observed delay spread in prior work. We characterize the magnitude of the impact of simultaneous measurements and identify strategies and cases that can reduce the difference. Furthermore, we provide a potential explanation for our observations in terms of self-heating and the configurable clock network architecture. These experiments point to phenomena that must be characterized to better formulate on-chip FPGA delay measurements and to properly interpret their results.
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DOI:
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发表时间:
2010
期刊:
Symposium on Field Programmable Gate Arrays
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2010
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