How would the arrangement of Figure 6-16 have to be changed in order to perform the subtraction (B – A)?

Figure 6-16

Transcribed Image Text:

By B Bg B₂ 74HC382 Ay As As A₂ S₂ S₁ So CN Bg B₂ B₁ Bo A₂ A₂ A₁ A CN4 OVR F₁ F₂ F₁ Fo • Notes: Z1 adds lower-order bits. Z2 adds higher-order bits. 8-bit sum OVR of Z2 is 8-bit overflow indicator. Z2 By By Bi Bo S₂ S₁ So CN B₂ B₂ B₁ Bo A₂ A₂ A₁ A₂ 74HC382 CN 4 OVR A₂ A₂ A₁ Ap F₂ F₂ F₁ Fo III Σ3 22 21 20 Z1