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Lookup table circuit optionally configurable as two or more smaller lookup tables with independent inputs

  • US 6,998,872 B1
  • Filed: 06/02/2004
  • Issued: 02/14/2006
  • Est. Priority Date: 06/02/2004
  • Status: Active Grant
First Claim
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1. A lookup table (LUT) circuit, comprising:

  • a plurality of memory cells;

    a plurality of LUT input terminals;

    first and second LUT output terminals;

    a first multiplexer stage having input terminals coupled to the memory cells, select terminals coupled to at least a first one of the input terminals, and output terminals, a first output terminal of the first multiplexer stage being coupled to the first LUT output terminal;

    a second multiplexer stage having input terminals coupled to the output terminals of the first multiplexer stage, select terminals coupled to at least a second one of the input terminals, and an output terminal coupled to the second LUT output terminal; and

    a tristate buffer circuit coupled between the first output terminal of the first multiplexer stage and a first input terminal of the second multiplexer stage.

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