Construct a 2-bit logic unit that is actually a part of an ALU. This logic unit will have 4 micro-operations which are AND, OR, XOR, and NOT operations. Logic micro-operations are very useful for manipulating individual bits or a portion of a word stored in a register. They can be used to change bit values, delete a group of bits or insert a new set of bits in a register. As we are going to design a 2-bit logic unit, we will have two outputs which is one output for each of the 2 bits.

Objective:

Our objective in this experiment was to construct a 2-bit logic unit. This logic unit is a part of ALU. This 2-bit logic unit will have 4 operations which are AND, OR, NOT and XOR. We’ll have 2 outputs each indicating one bit as it’s a 2-bit logic unit. Logic operations are very much useful in manipulating bits.

Equipments:

 Trainer board

 IC 7404,7408,7432,7486, 74F153

 Wires for connection.

Procedure:

1) Place the ICs on the trainer board.

2) Connect Vcc and ground to the respective pins of IC.

3) Connect the inputs with the switches and the outputs with LEDs.

4) Apply various combinations of inputs and observe the outputs.

5) Verify the experimental outputs with the Truth Table.

Truth Table:

Circuit diagram: 

A1 A0 30 ANDI ANIXO ORI ORO XORI XORO NOT NOT Al AO 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 o o 1. o o Co O 1. 1, 1. 1, 1, 1. 1. 1. 1, 1, 1, 1. 1. 1. 1, 1, o oo -o Ooo oo- o oo 01 1. 1.