CS301 Lab: Using VHDL to Describe Mutiplexers

Objectives of this lab:

	To learn more about VHDL Syntax structures.
	To create VHDL Models with LogicWorks 5 and build 
	circuits to test your multiplexers.

Preparation

	Read lab lecture notes. 

Lab Assignments

1. Build an 8-to-1 Multiplexer device with a VHDL Model.

• The problem:
  Make a table listing which digital audio source in the following
  Digital Audio Multiplexer is routed to the output Y for each
  combination of the multiplexer select inputs.
  CD = compact disc;
  DAT = digital audio tape.

• Create a VHDL Model for a Device Symbol "mux81".
• Build a simple circuit by connecting some I/O devices and verify the truth table of the 8-to-1 Multiplexer.

  Hand in the following:

• The truth table of the 8-to-1 Multiplexer.
• Print out of your VHDL Model file for the 8-to-1 Multiplexer.
• Print out of the circuit with the newly created device of your 8-to-1 Multiplexer to test its truth table.

2. Build a quadruple 8-to-1 Multiplexer device with a VHDL Model.

• A quadruple 8-to-1 Multiplexer is a MUX with 8 switched groups of 4-bit each.
• Write the truth table for this device, showing which inputs are selected for every binary combination of the selected inputs.
• Use double subscript notation. (e.g. D03 D02 D01 D00)
• Create a VHDL Model for a Device Symbol "muxQ81".
• Build a simple circuit by connecting some I/O devices such as hex keyboard, hex display,
  or the 7-segment display device you created in the previous lab and the digital display device
  to verify the output of your quadruple 8-to-1 Multiplexer device.

  Hand in the following:

• The truth table of the quadruple 8-to-1 Multiplexer.
• Print out of your VHDL Model file for the quadruple 8-to-1 Multiplexer device.
• Print out of the circuit with the newly created device of quadruple 8-to-1 Multiplexer to demonstrate its output.

Questions

  1. What defines whether a multiplexer application is time-dependent or not? 
  2. What additional component can be added to make a MUX application 
     time-dependent?

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Copyright: Department of Computer Science, University of Regina.