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/* Building a 4-Bit Shift Register Using D Flip-Flops */
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A shift register is a multi-output digital circuit that transfer the input data to its outputs sequentially at each clock cycle. Cascade the four D flip-flops as shown on the figure by connecting the Q pin of each to the D pin of the next. All four flip-flops share the same clock signal. Use the same clock settings from the previous part (Period = 100ns and Pulse Width = 50ns). Set the step time to 20ns. Enable the live digital timing diagram. Run a [[Digital Simulation|digital simulation]] and step through 1200ns. Set the value of the input "Data" to 0 and change it to 1 at t = 100ns and change it back to 0 at t = 600ns.
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