Use a 2-to-4 decoder, NAND gates, and edge-triggered D flip ? flops to design a 4-bit shift register module that has the following function table:

Draw a logic diagram for your module.

S1 SO Mode 0 0 Shift right (all 4 bits) 0 1 Shift left (all 4 bits) 1 0 1 1 Synchronous common clear Synchronous parallel load