Apply the following inputs to the ALU of Figure 6-15, and determine the outputs: S 2 S
Question:
Apply the following inputs to the ALU of Figure 6-15, and determine the outputs: S2S1S0 = 001, A3A2A1A0 = 1110, B3B2B1B0 = 1001, CN = 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.
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Related Book For
Digital Systems Principles And Application
ISBN: 9780134220130
12th Edition
Authors: Ronald Tocci, Neal Widmer, Gregory Moss
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