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Programmable macrocell using eprom or eeprom transistors for architecture control in programmable logic circuits

  • US 4,713,792 A
  • Filed: 06/06/1985
  • Issued: 12/15/1987
  • Est. Priority Date: 06/06/1985
  • Status: Expired due to Term
First Claim
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1. A programmable macrocell in an integrated circuit device comprising:

  • electronic circuit means responsive to a program control signal and operative to perform a particular operation selected by said control signal on an input data signal and to develop a commensurate output data signal, said electronic circuit means including an inversion control circuit having exclusive NOR gate means with one input thereof receiving said control signal and another input thereof receiving said input data signal; and

    architecture control means including one or more architecture control circuits each havinga programmable EPROM device having gate, drain and source electrodes and which when programmed generates a logic signal of a first state and when unprogrammed generates a logic signal of a second state,read and write control means connected to said EPROM device and responsive to an input program data signal and a corresponding address signal and operative to program said EPROM device by applying a programming potential thereto, andsense means connected to said EPROM device for sensing the programmed or unprogrammed state of said EPROM device and for developing a commensurate control signal for input to said inversion control circuit,whereby in response to said control signal said inversion control circuit causes an input data signal to be inverted when an associated EPROM device is in said first state and to be not inverted when said EPROM device is in said second state.

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