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haganmc Group Title

Use a 3-to-8 decoder, NAND gates, and edge-triggered D flip-flops to design a 4-bit shift register module that has the following function table:

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    S2 S1 S0 Mode 0 0 0 shift right (all 4 bits) 0 0 1 Shift left (all 4 bits) 0 1 0 Synchronous common clear 0 1 1 Synchronous parallel load 1 0 0 Synchronous preset MSB to 1 and clear other bits 1 0 1 Synchronous data hold 1 1 0 Ring counter (Q output of LSB is fed back as serial input to the MSB) 1 1 1 Twisted-ring counter (Qnot output of LSB is fed back as serial input to the MSB)

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