(Solved): Design an 8-bit binary subtractor using two 4-bit binary adders in a hierarchical design. The 8-bi ...

Design an 8-bit binary subtractor using two 4-bit binary adders in a hierarchical design. The 8-bit binary subtractor should have the following interface: • Input a: first 8-bit operand. • Input b: second 8-bit operand. Output d: 8-bit result. ? Each 4-bit binary adder is a module with the following interface: • Input a: first 4-bit operand. • Input b: second 4-bit operand. • Input cin: 1-bit carry-in signal. • Output s: 4-bit sum. • Output cout: 1-bit carry-out signal. Draw a circuit diagram for the 8-bit binary subtractor. You do not need to implement the 4-bit adders themselves; just use them as preexisting logic blocks. Be very mindful about your notation when reusing logic blocks and labeling signals.