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:
International Symposium on Field-Programmable Gate Arrays
影响因子:
--
通讯作者:
DeHon, Andre
DeHon, Andre
中科院分区:
--
文献类型:
--
作者:
Linscott, Timothy A.;Gojman, Benjamin;Rubin, Raphael;DeHon, Andre

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最近的工作展示了如何使用片上结构来测量现代FPGA上细粒度资源的制造延迟。我们发现,同时测量多个,不相交的路径将导致不同的测量延迟从孤立的配置,测量一个单一的path. On旋风III,我们显示的差异大到+/-33ps的2ns长的路径,即使同时配置的逻辑不活跃。这是在这些设备上使用的测量精度的20倍以上,并且超过先前工作中观察到的延迟扩展的50%。我们的特点的影响,同时测量的大小,并确定战略和情况下,可以减少差异。此外,我们提供了一个潜在的解释,我们的观察自加热和可配置的时钟网络架构。这些实验指出了必须表征的现象,以便更好地制定片内FPGA延迟测量并正确解释其结果。
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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