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- W2616122906 abstract "Reducing worst case routing latencies while delivering high throughput and low energy are key design concerns in the engineering of overlay packet-switched NoCs for FPGA fabrics. Deflection routed torus NoCs are known to map particularly well to modern wire-rich FPGA substrates with fracturable LUT organizations while delivering high sustained bandwidths for various workloads and traffic patterns. However, they suffer from significantly higher worst case routing latencies due to deflections, particularly at large system sizes, when compared to classic buffered NoCs. To tackle this challenge, we design a deadlock-free hierarchical torus that (1) targets worst case latencies in deflection torus NoCs by separating deflections into two levels of the NoC, (2) delivers an FPGA-friendly design for deadlock freedom by providing physical escape channels in the lower levels, and (3) naturally supports physical layout for large multi-die FPGA chips by mapping upper level links to expensive interposer connections between dies. We generate layouts for implementing the NoC on the ML605 board (XCV6LX240T FPGA), VC707 board (XC7VX485T FPGA) and large multi-die XC7V2000T chips while delivering fast 300–500MHz NoCs while consuming 10–15% of FPGA LUT resources. For instance with the 16×16 NoC, we reduce worst case deflection costs by 1.5–10× while simultaneously improving sustained rates by 1.5–2× and lowering energy requirements by 25% for a range of statistically-generated traffic patterns." @default.
- W2616122906 created "2017-05-26" @default.
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- W2616122906 date "2016-12-01" @default.
- W2616122906 modified "2023-09-24" @default.
- W2616122906 title "Deflection routing for multi-level FPGA overlay NoCs" @default.
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- W2616122906 doi "https://doi.org/10.1109/fpt.2016.7929521" @default.
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