![]() MultiplexerĪ multiplexer is the foremost application of a combinational logic circuit. The below circuit diagram clearly explains the flow of the n-bit parallel subtractor. When A>B and C is 0 and the result of A-B in binary format, then C =1 and the output is in 2’s complement form.Then the 4-bit adder adds A and the complement of B and delivers subtraction results.The subtracted number has to be passed through an inverter to get its complement.In detail, the process can be explained as: So, here we make use of binary adder to carry out the subtraction process. For instance, we can carry out A-B either by the addition of 1’s or 2’s complement of B to the A input. Note: Subtraction operation can be performed either by 1’s or 2’s complement of the number that has to be subtracted. ![]() ![]() In general, all the output columns are represented in a single table.įor example, an expression that can be represented in the above three approaches as follows: For every single-bit output in the logic block, a truth table is necessary to represent the logic. Truth table – This method computes the operational values of logical expressions for every combination of values taken by their logical variables.Every digital system is basically designed with logic gates and so Boolean algebra is the one foremost approach to represent a combinational logic circuit. Boolean algebra – This representation stipulates the association that is between Boolean variables and is used to design digital circuitry through logic gates.NAND, NR, NOT, NOR, OR, AND are all logic gates. Logic gates – These are the basic building blocks in the development of combinational logic circuits.Here, we discuss the three approaches of representing combinational logic circuits Representation of Combinational Logic Circuits
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