Question: Design an n -bit adder/ subtractor that has an external input called SUB that when 1, performs a subtraction, when 0, performs an addition. (Hint:

Design an n-bit adder/ subtractor that has an external input called SUB that when 1, performs a subtraction, when 0, performs an addition.

(Hint: Use an adder with a carry-in input and a mux.)

HW9: Design a left-shift by one combinational building block.

HW10: Design a counter that can count either up or down. Assume that you have

incrementer and decrementer building blocks available.

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