| 摘要 |
PURPOSE:To simplify the circuit configuration of a variable stage number shifting circuit whose data word length of input signals is (n) and longest shift stage number is (m), by constituting the circuit of (n) pieces of blocks, in each of which a circuit composed of a flip flop circuit and gate is connected in (m) stages, and one piece of decoder circuit. CONSTITUTION:Clock signals are inputted to gates 5 and 6 of the initial stage and the gate outputs of the preceding stage are connected to gates 7-14 of the succeeding stages. Clock signals are supplied to flip-flop circuits 1-4 of each stage from corresponding gate outputs. A control signal which is given in k-bit binary code is converted into a thermometer code signal which produces a signal having a bit width of 2k digit and corresponding to the digit of the input control signal by means of a decoder circuit 15 and, by controlling the clock by supplying the output of the decoder circuit 15 to the gates of corresponding stages, clocks are supplied to flip-flop circuits corresponding to an optional shifting stage number only. Then the level of a clock input terminal is fixed so that the master flip-flop circuits and slave flip-flop circuits of the succeeding flip-flop circuits can be set to through-modes and output signals are obtained from the output terminal of the flip-flop circuit of the final stage.
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