Hello Friends,
First off, thanks for taking a look at the problem. We are supposed to design a counter circuit that counts from 0 to 5, skips 2 (010) and after reaching 5 restarts from 0 (skips 6 and 7). I worked out the truth table and the relevant logic gates necessary to be added in a mod 8 counter using 3 synchronous D flip flops and have posted an image of my work as well as the multi sim simulation. Please excuse the uncleanliness of the circuit design.

My Problem: The counter counts till 4 successfully skipping 2 but restarts without going to 5. I have been trying to rack my brain over this for a bit and I am sure there is something fundamental I have missed here. Any help/advice would be appreciated. Also if someone can suggest a fundamental approach/technique to solving or design a circuit I would much appreciate the gesture.

PLEASE NOTE: Change the extension of the doc file to .ms13 in order to open it in multi sim. Thanks

 

Welcome to AAC!

Truth table:

Equations:

Post your Kmaps so we can see how you derived the equations.

 

Your first document doesn't seem to be in any normal Word format that I can determine. Try printing it to a PDF file or taking a screen shot of the relevant portion.

Have you checked your equations. For instance, if you are instate 100, what state do your equations say that you will go to next?

 

Hello guys, thank you so much for your prompt replies. Turns out I had a misplaced value and at Dennis's suggestion after redrawing the K-maps cleanly, realized my mistake. Also the checking the equations is something I hadn't thought of before so thank you very much for that approach.

 

Hello guys, thank you so much for your prompt replies. Turns out I had a misplaced value and at Dennis's suggestion after redrawing the K-maps cleanly, realized my mistake. Also the checking the equations is something I hadn't thought of before so thank you very much for that approach.

What are the new equations?