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Programmable logic array

  • US 5,781,031 A
  • Filed: 11/21/1995
  • Issued: 07/14/1998
  • Est. Priority Date: 11/21/1995
  • Status: Expired due to Fees
First Claim
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1. A programmable logic array (PLA), comprising:

  • a plurality of memory cells and memory circuits, wherein said memory circuits allow operation of said memory cells for storage apart from said PLA, wherein said plurality of memory cells and memory circuits comprises;

    a first memory array having a plurality of inputs, a plurality of outputs and being arranged in rows and columns, said first memory array acting as an AND array and said plurality of columns acting as product term lines;

    a second memory array coupled to said first memory array having a plurality of inputs, a plurality of outputs and being arranged in rows and columns, said second memory array acting as an OR array and said plurality of columns acting as product term lines;

    PLA logic circuitry coupled to at least some of said plurality of memory cells, said PLA logic circuitry comprising a plurality of inputs, a plurality of outputs, and a feedback connection between at least one of said plurality of outputs and at least one of said plurality of inputs; and

    mode selection circuitry permitting operation of said plurality of memory cells as a memory apart from said PLA.

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