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(Solved): Consider a 4 bit Adder given the following figure, where A and B are 4 bit numbers: 1- Dress th ...
Consider a 4 bit Adder given the following figure, where and are 4 bit numbers: 1- Dress the corresponding truth table 2- To realize a BCD adder, we need to: - Step 1: First add the two binary numbers A and B - Step2: If the sum is less or equal than 9, then the value of sum and binary sum will be the same otherwise we will add 6 (0110 in binary) a) Dress the truth table for the sum (from decimal numbers 0 to 15 ) b) Give the conditions from the truth table where we need to add 6 to the binary sum? Give a logic equation c) Design a BCD adder using two 4 bits' adder and gate AND and OR
Expert Answer
a) To dress the truth table for the BCD sum, we need to consider the decimal numbers 0 to 15 and determine their corresponding BCD sum. The BCD sum is a 4-bit number, so we will have four output columns for the BCD sum bits (S3, S2, S1, and S0).Here is the truth table: