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Electrically switchable permanent storage

  • US 4,445,202 A
  • Filed: 11/02/1981
  • Issued: 04/24/1984
  • Est. Priority Date: 11/12/1980
  • Status: Expired due to Term
First Claim
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1. A permanent storage array having at least two independently selectable logic functions comprising:

  • a matrix arrangement including a plurality of input and output lines forming crosspoints;

    control lines for the selective activation of one of the at least two independently selectable functions;

    coupling elements provided at said crosspoints which depending on their individual personalization selectively provide an electrically conductive path at a crosspoint, said coupling elements being formed of transistor structures with two gated electrodes and at least two gating electrodes, the associated circuit path between said two gated electrodes becoming conductive when a turn-on potential is applied to the at least two gating electrodes; and

    connecting means connecting one of the gating electrodes of said coupling elements to the control line determinative of one of said selectable functions and the at least one remaining gating electrode of said coupling element to a corresponding input line for establishing connection in only one of said at least two independently selectable functions, said connecting means connecting all of the at least two gating electrodes of said coupling elements to the corresponding input line for establishing connections in all of said at least two independently selectable functions.

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