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Field-programmable device with buffer between programmable circuit

  • US 4,783,763 A
  • Filed: 12/23/1985
  • Issued: 11/08/1988
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Fees
First Claim
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1. A field-programmble device in which there are:

  • first and second circuits, each having at least one field-programmable element;

    first and second lines respectively connected to the first and second circuits;

    means for coupling the first and second lines;

    a first current supply for providing the first line with current adequate for normal operation of the device but insufficient to enable any of the field-programmable elements to be programmed; and

    select means for providing the first line with current that reaches a level sufficient tb enable each field-programmable element in the first circuit to be programmed during a programming period;

    characterized in that the coupling means comprises;

    a second current supply for providing current at a node;

    a first rectifier coupled between the first line and the node;

    a second rectifier coupled between the node and the first line in the opposite forward conductive direction to the first rectifier;

    an amplifier having a first flow electrode, a second flow electrode, and a control electrode for controlling current transmission between the flow electrodes, the control electrode coupled to the node, the second electrode coupled to the second line; and

    supply means for providing the first electrode with current which is normally insufficient to enable any of the field-programmable elements to be programmed but which, in conjunction with the current from the select means, reaches a level sufficient to enable each field-programmable element in the second circuit to be programmed during a programming period.

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