Q4. A70 B7-0 8 BCD to Binary BCD to Binary Asien 18 Z Bsien 1 MG 8 Binary to 2's complement Binary to 2's complement Asign Overflow detector 8-bit adder E, E2 O We want to design a basic decimal calculator, which can be used to add or subtract 2-digit (from -99 to +99) decimal numbers. We will attempt to design a logic circuit that accepts two signed integers A and B, and a control signal Z, which is set to 0 for addition and 1 for subtraction, and outputs the result as an 8-bit binary number in its 2's complement representation. The input BCD numbers A and B will be represented as: Asign = 0 for A 20, and Asign = 1 for A 127, then we set E, =1 and E=1, . Identify the truth table for E, and E, in terms of Asign, Bsign and O, and implement it using only NAND and NOT gates. Q4. A70 B7-0 8 BCD to Binary BCD to Binary Asien 18 Z Bsien 1 MG 8 Binary to 2's complement Binary to 2's complement Asign Overflow detector 8-bit adder E, E2 O We want to design a basic decimal calculator, which can be used to add or subtract 2-digit (from -99 to +99) decimal numbers. We will attempt to design a logic circuit that accepts two signed integers A and B, and a control signal Z, which is set to 0 for addition and 1 for subtraction, and outputs the result as an 8-bit binary number in its 2's complement representation. The input BCD numbers A and B will be represented as: Asign = 0 for A 20, and Asign = 1 for A 127, then we set E, =1 and E=1, . Identify the truth table for E, and E, in terms of Asign, Bsign and O, and implement it using only NAND and NOT gates