NDLI: A scalable routability-driven analytical placer with global router integration for FPGAs (abstract only)

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A scalable routability-driven analytical placer with global router integration for FPGAs (abstract only)

Content Provider	ACM Digital Library
Author	Young, Evangeline F.Y. Tang, Wai-Chung Lam, Ka Chun
Abstract	As the sizes of modern circuits become bigger and bigger, implementing those large circuits into FPGA becomes arduous. The state-of-the-art academic FPGA place-and-route tool, VPR, has good quality but needs around a whole day to complete a placement when the input circuit contains millions of lookup tables, excluding the runtime for routing. To expedite the placement process, we propose a routability-driven placement algorithm for FPGA that adopts techniques used in ASIC global placer. Our placer follows the lower-bound-and-upper-bound iterative optimization process in ASIC placers like Ripple. In the lower-bound computation, the total HPWL, modeled using the Bound2Bound net model, is minimized using the conjugate gradient method. In the upper-bound computation, an almost-legalized result is produced by spreading cells linearly in the placement area. Those positions are then served as fixed-point anchors and fed into the next lower-bound computation. Furthermore, global routing will be performed in the upper-bound computation to estimate the routing segment usage, as a mean to consider congestion in placement. We tested our approach using 20 MCNC benchmarks and 4 large benchmarks for performance and scalability. Experimental results show that based on the island-style architecture which VPR is most optimized for, our approach can obtain a placement result 8x faster than VPR with 2% more in channel width, or 3x faster with 1% more in channel width when congestion is being considered. Our approach is even 14x faster than VPR in placing large benchmarks with over 10,000 lookup tables, with only 7% more in channel width.
Starting Page	242
Ending Page	242
Page Count	1
ISBN	9781450326711
DOI	10.1145/2554688.2554711
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-02-26
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Routability-driven Fpga Placement
Content Type	Text
Resource Type	Article

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