CSC270 Homework 4 2011

--D. Thiebaut 10:42, 19 February 2011 (EST)

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This assignment is about multiplexers and RS flipflops. You can work on this assignment in pairs if you wish. The due date is next Friday, at midnight.

Page under construction!

Problem #1

• Implement a majority voter with a 4-to-1 multiplexer.
• Show the Karnaugh map and logic diagram that you use to find your answer.
• Similarly, use an 8-to-1 multipler and implement the same majority voter.

Problem #3

• The SR flipflop is the basic element of sequencial circuit. Its main property is memory. It can be used to remember a bit, either 0, or 1. Storing a bit in the flipflop is performed by activating one of the two inputs.

• If we were to switch one of the NANDs in the circuit above for a NOR, would we still have a flipflop? Why or why not?
• If we were to replace both NANDs by two exclusive-ORs, would we still have a flipflop, i.e. a circuit that has memory, in which we can store either 1 or 0?

Submission

• Write your answers in a pdf called hw4.pdf and submit it to your 270b-xx account as usual.