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<p>In the paper, the authors defined the well-structured symmetric switch block M_N,W showed that M_N,W is universal for any pair of positive integers N and W. However, we find that this result is partially correct. Here, we show that, when N>=7, M_N,W is not universal for odd Ws (>=3) and it is universal for any even W.</p>
Field programmable gate array, universal switch block design, FPGA routing.

H. Fan, Y. Chang and Y. Wu, "Comment on Generic Universal Switch Blocks," in IEEE Transactions on Computers, vol. 51, no. , pp. 93-95, 2002.
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