Modify the circuit of Figure 6-14 so that a single control input, X, is used in place of ADD and SUB. The circuit is to function as an adder when X = 0, and as a subtractor when X = 1. Then simplify each set of gates.

Figure 6-14

Transcribed Image Text:

Transfer pulse 8 B₂B₂ B₂ B₂ D 12 7 B₂ CLK A3 Im A3 6 D B register 11 5 B₂ CLK A₂ A₂ D 10 B₁ 3 74LS283 A₁ A₁ CLK BoBo 2 D Bo CLK A A₂ ADD SUB 44 45 Col