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The effect of logic block architecture on FPGA performance

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4 Author(s)
Singh, S. ; Dept. of Electr. Eng., Toronto Univ., Ont., Canada ; Rose, J. ; Chow, P. ; Lewis, D.

This authors explore the effect of logic block architecture on the speed of a field-programmable gate array (FPGA). Four classes of logic block architecture are investigated: NAND gates, multiplexer configurations, lookup tables, and wide-input AND-OR gates. An experimental approach is taken, in which each of a set of benchmark logic circuits is synthesized into FPGAs that use different logic blocks. The speed of the resulting FPGA implementations using each logic block is measured. While the results depend on the delay of the programmable routing, experiments indicate that five- and six-input lookup tables and certain multiplexer configurations produce the lowest total delay over realistic values of routing delay. The fine grain blocks, such as the two-input NAND gate, exhibit poor performance because these gates require many levels of logic block to implement the circuits and hence require a large routing delay

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:27 ,  Issue: 3 )

Date of Publication:

Mar 1992

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