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At the school (Dennis Gabor College) the teacher gave us a task to design a four bit synchronous sequential circuit whit D flip-flops which cycles through the given states: 1101 - 1111 - 1010 - 1111 - 1101 - 1011

We have no idea how to begin whit this, because the two state which repeating.

Thanks for any help! :)

Have you asked Google?

"design a 4 bit synchronous counter with a given sequence"

Do these help?

http://www.wjec.co.uk/uploads/publications/10218.doc

and:

http://www.utem.edu.my/myweb/sani/pdf/digsys_chapter%202.pdf

Thank you! Yep, i asked Google :D I made 3 circuit, but none of them working correctly. I think whit this sequence is not possible to design a counter.