From: Subject: Prac 1 - Combinational Logic Date: Thu, 2 Aug 2007 11:28:25 +1000 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0044_01C7D4F8.3D84A6B0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0044_01C7D4F8.3D84A6B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.itee.uq.edu.au/~elec2002/pracs/prac_1/index.html Prac 1 - Combinational Logic

ELEC2002 - Prac 1

Combinational Logic and Adders

Updated - 28 July, 2006=20 Author: Len Payne, Edited by Peter Waldeck=20

Goal

See the following topics:=20

Back to = Lab=20 Experiment Index=20

Preparation

  1. Prepare a circuit=20 schematic diagram of the 2-input AND gate shown in Figure=20 1a. The two inputs, A and B will connect to toggle = switches=20 and the output F will connect to an LED on the logic = workstation.=20 Complete the truth table in Figure=20 1b.=20

    (a) Logic diagram
    (b) Truth = table
    Figure=20 1. 2-input AND gate.

  2. Prepare a circuit schematic diagram of the 2-input OR gate shown = in Figure=20 2a. The two inputs, A and B will connect to toggle = switches=20 and the output F will connect to an LED on the logic = workstation.=20 Complete the truth table in Figure=20 2b.=20

    (a) Logic diagram
    (b) Truth = table
    Figure=20 2. 2-input OR gate.

  3. Prepare a circuit schematic diagram of the 2-input NAND gate shown = in Figure=20 3a. The two inputs, A and B will connect to toggle = switches=20 and the output F will connect to an LED on the logic = workstation.=20 Complete the truth table in Figure=20 3b and compare with the truth table in Figure=20 1b.=20

    (a) Logic diagram
    (b) Truth = table
    Figure=20 3. 2-input NAND gate.

  4. Prepare a circuit schematic diagram of the circuit shown in Figure=20 4a. The two inputs, A and B will connect to toggle = switches=20 and the output F will connect to an LED on the logic = workstation.=20 Complete the truth table in Figure=20 4b and compare with the truth table in Figure=20 3b.=20

    (a) Logic diagram
    (b) Truth = table
    Figure=20 4. 2-input OR gate with inverted inputs.

  5. Prepare a circuit schematic diagram of the circuit shown in Figure=20 5a. The three inputs, A, B and C will connect = to=20 toggle switches and the output F will connect to an LED on the = logic=20 workstation. Complete the truth table in Figure=20 5b and compare with the truth table of a 3-input OR gate.=20

    (a) Logic diagram
    (b) Truth = table
    Figure=20 5. Cascaded 2-input OR gates.

  6. A full-adder can be implemented with two half-adders and one OR = gate, as=20 shown in Figure=20 6. Prepare a circuit schematic diagram of the full-adder. The = three inputs=20 will connect to toggle switches and the two outputs will connect to = LEDs on=20 the logic workstation.  Prepare a truth table for this circuit.

     

    Figure 6. Implementation of a full-adder. =

     

Back=20 to Contents=20

Procedure

  1. Wire up and test the 2-input AND gate shown in Figure=20 1a from the circuit schematic diagram that you have prepared. = Connect the=20 two inputs, A and B to toggle switches and the output = F=20 to an LED on the logic workstation. Compare the results with the truth = table=20 that you completed in Figure=20 1b.=20

  2. Wire up and test the 2-input OR gate shown in Figure=20 2a from the circuit schematic diagram that you have prepared. = Connect the=20 two inputs, A and B to toggle switches and the output = F=20 to an LED on the logic workstation. Compare the results with the truth = table=20 that you completed in Figure=20 2b.=20

  3. Wire up and test the 2-input NAND gate shown in Figure=20 3a from the circuit schematic diagram that you have prepared. = Connect the=20 two inputs, A and B to toggle switches and the output = F=20 to an LED on the logic workstation. Compare the results with the truth = table=20 that you completed in Figure=20 3b.=20

  4. Wire up and test the circuit shown in Figure=20 4a from the circuit schematic diagram that you have prepared. = Connect the=20 two inputs, A and B to toggle switches and the output = F=20 to an LED on the logic workstation. Compare the results with the truth = table=20 that you completed in Figure=20 4b.=20

  5. Wire up and test the circuit shown in Figure=20 5a from the circuit schematic diagram that you have prepared. = Connect the=20 three inputs, A, B and C to toggle switches and = the=20 output F to an LED on the logic workstation. Compare the = results with=20 the truth table that you completed in Figure=20 5b.=20

  6. Wire up and test the full adder circuit shown in Figure=20 6 from the circuit schematic diagram that you have prepared. = Connect the=20 three inputs, A, B and Ci to toggle switches and = the=20 outputs S and C to LEDs on the logic workstation. = Compare the=20 results with the truth table that you prepared.=20

Back=20 to Contents=20

Equipment

Back=20 to Contents=20

References

Back=20 to Contents=20

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