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Macrocell with flexible product term allocation

  • US 5,350,954 A
  • Filed: 03/29/1993
  • Issued: 09/27/1994
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Term
First Claim
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1. Programmable logic array apparatus comprising a plurality of macrocells each of which receives a finite number of multiple input signals, each macrocell comprising:

  • a first logic gate for producing a first logical function of a first number of the input signals, the first number being from zero to the finite number;

    a second logic gate for producing a second logical function of a second number of the input signals, the second number being from zero to the finite number, such that the first number added to the second number is finite number; and

    allocation logic for receiving the first logical function of the first number of input signals from the first logic gate and allocating the first logical function of the first number of input signals to another macrocell, wherein when the first logical function of a first macrocell is allocated to a second macrocell, the first logic gate of the second macrocell receives the first logical function of the first macrocell the second logical function of the first macrocell is retained by the first macrocell.

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