![]() ![]() The full-subtractor circuit differs only slightly from the full-adder, in that the subtractor requires two inverters that are not needed by the adder. Once a bit-slice subtractor circuit has been designed, it can be replicated N time to create an N-bit subtractor. The design process closely follows adder design, in that sample subtraction problems can be studied to gain insight into subtractor requirements, a truth table can be prepared based on the observations, and then a circuit can be designed from the truth table. Like adders, the simplest subtracting circuits perform subtraction bit-by-bit from the LSB to the MSB, and they are most easily designed using the bit-slice approach. Subtractor circuits are rarely encountered in digital systems (for reasons that will be explained later), but they nevertheless provide an interesting design opportunity. Subtracting circuits use two N-bit operands to produce an N-bit result and a borrow out signal. ![]() ![]() USB Scopes, Analyzers and Signal Generators. ![]()
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