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Generic universal switch blocks

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4 Author(s)
Michael Shyu ; Dept. of Comput. & Inf. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Yu-Dong Chang ; Guang-Ming Wu ; Yao-Wen Chang

A switch block M with W terminals on each side is said to be universal if every set of nets satisfying the dimension constraint (i.e., the number of nets on each side of M is at most W) is simultaneously routable through M (Y.W. Chang et al., 1996). We present an algorithm to construct N-sided universal switch blocks with W terminals on each side. Each of our universal switch blocks has (2 N)W switches and switch-block flexibility N-1 (i.e., F S=N-1). We prove that no switch block with less than (2 N)W switches can be universal. Further, the decomposition property of a universal switch block provides a key insight into its layout implementation with a smaller silicon area. We also compare our universal switch blocks with others of the topology associated with Xilinx XC4000-type FPGAs. Experimental results demonstrate that our universal switch blocks improve routability at the chip level

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Computer Design, 1999. (ICCD '99) International Conference on

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