Please find attached the Kmaps

The first kmap I looked at was for QKD. It's wrong.

Why are you not including information for the invalid counts? This has gone on for so long that I'm going to give you this one. It should be KD=1. Can you determine how I got that and why I keep telling you that you need to use the invalid counts to simplify logic?

 

The first kmap I looked at was for QKD. It's wrong.
View attachment 136515
Why are you not including information for the invalid counts? This has gone on for so long that I'm going to give you this one. It should be KD=1. Can you determine how I got that and why I keep telling you that you need to use the invalid counts to simplify logic?

No sir, that is what is giving me head ache.

 

No sir, that is what is giving me head ache.

Add the invalid counts to your truth table. How were you taught to treat them?

 

The first kmap I looked at was for QKD. It's wrong.
View attachment 136515
Why are you not including information for the invalid counts? This has gone on for so long that I'm going to give you this one. It should be KD=1. Can you determine how I got that and why I keep telling you that you need to use the invalid counts to simplify logic?

Please Sir, take a look at what I have done again based on your instructions. I believe this is the best I can do. The circuit is counting from 0-4, 9. I don't really understand why the remaining numbers are not coming up.

Thanks sir.

 

I believe this is the best I can do.

Your kmaps are wrong. Post your truth table showing the JK data.

You appear to have a missing connection dot on the J input of U9. Your schematic would be easier to read if you avoided unnecessary wire jogs and crossings.

 

You did post your updated truth table. I didn't see anything wrong with it, other than the fact that you keep omitting don't care counts and you don't order your table in gray code order. If they're not teaching you to do this, you should seriously consider a different school.

I'd also stop using Q0 and use a single letter; less writing. And make A always the LSB. Look at the datasheet for a counter like 74LS160. This is the way it's been done for more than 4 decades.

Why did you use a grouping of 4 instead of 8 for K1?

Why are you making groupings of only X's?

 

A redraw of your schematic:

Since your flip flops didn't have them; I left preset and clear inputs unconnected for clarity.

Original (with some annotations by me - until I couldn't trace connectivity):

 

Thank

Your kmaps are wrong. Post your truth table showing the JK data.

You appear to have a missing connection dot on the J input of U9. Your schematic would be easier to read if you avoided unnecessary wire jogs and crossings.

Thank you very much Sir, you have been really of great help to me in this project. I have successfully completed the circuit and its giving me the desired output.
I am really grateful Sir

 

I have successfully completed the circuit and its giving me the desired output.

What was the problem?

 

What was the problem?

I had a missing dot connection on U9

 

Good day Sir,
After completion of the project, the Professor asked me to construct a seven segment decade down counter (9-0) using JK Flip-Flop. I have tried to revert the circuit for the up counter. However, it is only counting 8, 4, C, 2, A, 6, E, 1, 9

 

Post your truth table, kmaps, and schematic.

 

I had a missing dot connection on U9

Then your logic isn't minimized; gate count can go down by 2.

 

construct a seven segment decade down counter (9-0) using JK Flip-Flop.

This is quite similar to the count up counter.

 

After completion of the project, the Professor asked me to construct a seven segment decade down counter

Are you still working on this problem?

Did you receive lower credit for your up counter solution because logic wasn't minimized?

 

Are you still working on this problem?

Did you receive lower credit for your up counter solution because logic wasn't minimized?

Good day sir, I the Professor has received the up counter just the way it is working. I am currently writing exams, so he has asked that I complete the project after my exams.

 

I am currently writing exams

Okay. This time I'll walk you through how to troubleshoot the incorrect count sequence.