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Programmable logic device with programmable inverters at input/output pads

  • US 5,028,821 A
  • Filed: 03/01/1990
  • Issued: 07/02/1991
  • Est. Priority Date: 03/01/1990
  • Status: Expired due to Term
First Claim
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1. A programmable logic device comprising,a plurality of functional units, each functional unit having a set of inputs and a set of outputs, each functional unit being programmable for carrying out one or more specified logic functions,a plurality of input and output pins,programmable means for selectively coupling together said sets of inputs and outputs of said functional units and said input and output pins, wherein said programmable coupling means includes a matrix of crossing conductive lines with programmable links at intersections of conductive lines for selectively connecting said crossing conductive lines, each of said conductive lines being coupled to one of said input pins, output pins and functional unit inputs and outputs, anda set of programmable inverters connected between said pins and said programmable coupling means.

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