Problem about shift registers!

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RaulitoESP

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1. Which type of flip-flops (and in which operating mode, if it has optional modes) would you use for building a 4-bit shift register?

2. Explain how a binary number can be multiplied by 4 by using a shift register. Give examples in binary form, e.g. 4 * 3 = 12 or 4 * 5 = 20





I appreciate your help guys! Please help!
 

Thank you my friend! i appreciate that ! but what about first question? do you have any idea of it?
 

D-Flipflop
 

Either a D or a JK flip flop can easily do the job. If using a D flip flop, simply connect the output of a given stage to the D input of the next stage. If using the JK type flip flop, connect the K input to the complement of the J INPUT. The J input now acts the same as the D input to a D flip flop. Proceed as if using a D flip flop. Another way of using a JK is to connect the Q output of a given stage to the J input of the next stage. Connect the Qbar output of a given stage to the K input of the next stage.
 
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