Routing Algorithms for FPGAs With Sparse Intra-Cluster Routing Crossbars

Provided by: University of California, Los Angeles (Anderson)
Topic: Hardware
Format: PDF
Modern FPGAs employ sparse crossbars in their intra-cluster routing. Modeling these crossbars enlarges the Routing Resource Graph (RRG), a data structure used by most FPGA routers, while enlarging the search space for finding legal routes. The authors introduce two scalable routing heuristics for FPGAs with sparse intra-cluster routing crossbars: SElective RRG Expansion (SERRGE), which compresses the RRG, and dynamically decompresses it during routing, and Partial Pre-Routing (PPR), which locally routes all nets in each cluster, and routes global nets afterwards.

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