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Question Bank (2 marks) · Q32

Q.Draw the logic diagram of a SIPO shift register.

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[!TLDR]

SIPO: four D flip-flops in cascade — serial data in at D1D_1, each Q feeding the next D, common clock, and all four Q outputs taken out in parallel.

In a serial-in parallel-out shift register, data bits are entered one at a time (serially) at the input, but once stored, all bits are available at the same time on separate output lines (parallel). This makes it a serial-to-parallel converter. A four-bit version uses four D flip-flops FF1-FF4.

The logic diagram is drawn as follows:

  • The serial data input is applied to the D input D1D_1 of the first flip-flop.
  • Each flip-flop's Q output feeds the D input of the next: QA→D2Q_A \to D_2, QB→D3Q_B \to D_3, QC→D4Q_C \to D_4.
  • A common clock line CLK drives the clock inputs of all four flip-flops. …

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