Change the select code to 110, and repeat review question 1.

Data from question 1

Apply the following inputs to the ALU of Figure 6-15, and determine the outputs: S₂S₁S₀ = 001, A₃A₂A₁A₀ = 1110, B³B₂B₁B₀ = 1001, C_N = 1.

Figure 6.15

Transcribed Image Text:

A B S Inputs A3 B3 B₂ B₁ Bo CN S₁ So 74LS382/ 74HC382 A = 4-bit input number B = 4-bit input number CN = carry into LSB position S = 3-bit operation select inputs ALU Outputs (a) LL LL F₂ F₁₁ Fo CN+4 OVR F LL F = 4-bit output number CN+4 carry out of MSB position OVR = overflow indicator S₂ S₁ So 0 0 0 1 0 10000 1 1 1 1 DOTTOO 1 1 0 0 1 1 1 0 1 0 1 Function Table Operation CLEAR B minus A A minus B A plus B AⓇB A+B AB PRESET Comments F3F₂F₁F0-0000 Needs CN = 1 Needs CN=0 Exclusive-OR (b) OR AND F3F₂F₁F0=1111 Notes: S inputs select operation. OVR = 1 for signed-number overflow.