Dynamic FPGA routing for just-in-time FPGA compilation

Roman Lysecky, Frank Vahid, Sheldon X.D. Tan

Research output: Contribution to journalConference articlepeer-review

43 Scopus citations


Just-in-time (JIT) compilation has previously been used in many applications to enable standard software binaries to execute on different underlying processor architectures. However, embedded systems increasingly incorporate Field Programmable Gate Arrays (FPGAs), for which the concept of a standard hardware binary did not previously exist, requiring designers to implement a hardware circuit for a single specific FPGA. We introduce the concept of a standard hardware binary, using a just-in-time compiler to compile the hardware binary to an FPGA. A JIT compiler for FPGAs requires the development of lean versions of technology mapping, placement, and routing algorithms, of which routing is the most computationally and memory expensive step. We present the Riverside On-Chip Router (ROCR) designed to efficiently route a hardware circuit for a simple configurable logic fabric that we have developed. Through experiments with MCNC benchmark hardware circuits, we show that ROCR works well for JIT FPGA compilation, producing good hardware circuits using an order of magnitude less memory resources and execution time compared with the well known Versatile Place and Route (VPR) tool suite. ROCR produces good hardware circuits using 13X less memory and executing 10X faster than VPR's fastest routing algorithm. Furthermore, our results show ROCR requires only 10% additional routing resources, and results in circuit speeds only 32% slower than VPR's timing-driven router, and speeds that are actually 10% faster than VPR's routability-driven router.

Original languageEnglish (US)
Pages (from-to)954-959
Number of pages6
JournalProceedings - Design Automation Conference
StatePublished - 2004
EventProceedings of the 41st Design Automation Conference - San Diego, CA, United States
Duration: Jun 7 2004Jun 11 2004


  • Codesign
  • Configurable logic
  • Dynamic optimization
  • FPGA
  • Hardware/software partitioning
  • Just-in-time compilation
  • Place and route
  • Platforms
  • System-on-a-chip
  • Warp processors

ASJC Scopus subject areas

  • Hardware and Architecture
  • Control and Systems Engineering


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