Experiment for lab PLEASE HELP Part a - In this part of the experiment you will

Question

Experiment for lab PLEASE HELP

Part a - In this part of the experiment you will use two 74LS181s, a 4 bits ALU, and you will design an 8-bits ALU.

Consider how both arithmetic and logical operations work, as you are designing your 8 bit ALU. Determine how many inputs for data and operation selection you will need. You should connect the data inputs to either ground(0V) or Vcc (+5V) to create the following input values for inputs A = 11110000B and B = 10010110B. The operation selection inputs should be connected to the Logic Switches in the trainer thus allowing you to select the operation you want to perform without having to re-wire the circuit. Connect output F to the Logic Monitor. Please connect the MSB – Most Significant Bit to the leftmost Logic Monitor position and the LSB – Least Significant Bit to the rightmost Logic Monitor position. This allow us to read the results from left to right. I will test your circuit by asking you to perform both a logic and an arithmetic operations on inputs A and B.

Part b – Design a 3-bits 2’s complement adder/subtractor. This circuit should be able to add integers in the following range: -4 to +3.

Explanation / Answer

An arithmetic and logic unit is a combinational logic circuit capable of performing several arithmetic and logic functions, selected by a set of function-select inputs, on a pair of n-bit operands. In this experiment you will use the 74LS181, which is a 4 bits ALU and you will design the two circuit described below. Part A Design and build an 8-bit A.L.U. by cascading two 4-bit A.L.Us., 74LS181s, and verify their operation. Set input A to 11000101B and B to 10101100B, and use the following results to test your circuit: The first two rows of the table are arithmetic operations, and the bottom two rows are logical operations. The data above is assumed to be active high data; use the appropriate tables to get the values of S3, S2, S1, S0, M and Cn. Digital Inputs: A: 11000101 B: 10101100 A7 A6 A5 A4 A3 A2 A1 A0 1 1 0 0 0 1 0 1 B7 B6 B5 B4 B3 B2 B1 B0 1 0 1 0 1 1 0 0 Select Line Connections Mode S3 S2 S1 S0 Cn1 Cn2 M Value Addition H

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