Thank you. The goal is to design a multiplier by shift-add . I used two shift register and one full adder. connecting them together. I need to design a control unit for itHi,
You can simply use paper and pencil for this task. (That's what I do to get a more clear view on the problem)
I don't know what your design goals are .... but for a sequential solution you need just one shift register.
But you could also do a fully combinatorial solution without shift register at all.