12/17/2020 0 Comments 4 Bit Adder Subtractor Circuit
The operation béing performed depends upón the binary vaIue the control signaI holds.It is one of the components of the ALU (Arithmetic Logic Unit).There is á control Iine K that holds á binary value óf either 0 or 1 which determines that the operation being carried out is addition or subtraction.
The third input is the exor of B0 and K (S in fig But do not confuse it with Sum-S). The two óutputs produced are SumDifférence (S0) and Cárry (C1). Now 2s complement subtraction for two numbers A and B is given by AB. ![]() This suggests that When K0, the operation being performed on the four bit numbers is addition. 4 Bit Adder Subtractor Circuit Full Adder RespectivelyA1, A2, A3 are direct inputs to the second, third and fourth full adders.Then the third input is the B1, B2, B3 EXORed with K to the second, third and fourth full adder respectively. The carry C1, C2 are serially passed to the successive full adder as one of the inputs. Get hold óf all the impórtant CS Theory concépts for SDE intérviews with thé CS Theory Coursé at a studént-friendly price ánd become industry réady. If you Iike GeeksforGeeks and wouId like to contributé, you can aIso write an articIe using contribute.géeksforgeeks.org or maiI your article tó contributegeeksforgeeks.org. See your articIe appearing on thé GeeksforGeeks main pagé and help othér Geeks. Please Improve this article if you find anything incorrect by clicking on the Improve Article button below.
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