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Sequential logic circuit device

  • US 5,140,176 A
  • Filed: 03/07/1991
  • Issued: 08/18/1992
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Fees
First Claim
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1. A sequential logic circuit device comprising:

  • a logic circuit part composed of a flip-flop group including a plurality of flip-flop circuits and a combinatorial circuit connected to said flip-flop group, for performing a predetermined sequential logic operation;

    specify circuit means for selectively specifying said flip-flop circuits in said flip-flop group in accordance with an external address, said specify circuit means including decoder means for decoding said address and applying a decoded address signal to each said flip-flop circuit selectively specified in said flip-flop group; and

    write circuit means whereby set or reset signals are applied to said flip-flop circuits selectively specified by said specify circuit means, in accordance with an external setting signal;

    wherein each of said flip-flop circuits in said flip-flop group includes;

    flip-flop means for storing logic input data;

    first gate means responsive to said decoded address signal to apply said set signal to said flip-flop means to set said flip-flop means;

    second gate means responsive to said decoded address signal and cleared by an external clear signal to apply said reset signal to said flip-flop means to reset said flip-flop means; and

    third gate means for externally outputting the logic in said flip-flop means in response to said decoded address signal.

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