![]() ![]() Note: We can simplify each of the Boolean output functions with the help of the unique map method. The eight rows under the input variable designate all possible combinations of 0 and 1 that can occur in these variables.The 'Diff' and 'Borrow' are the output variables that define the output values.'Borrow in' is the third input which represents borrow.These variables represent the two significant bits that are going to be subtracted. ![]() The full subtractor has three input states and two output states i.e., diff and borrow. The full subtractor is used to subtract three 1-bit numbers A, B, and C, which are minuend, subtrahend, and borrow, respectively. To overcome this problem, a full subtractor was designed. The Half Subtractor is used to subtract only two numbers.
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