serial to parallel converter

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please help me in designing programmable serial to parallel converter of 4 to 12 bits using vhdl

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This is not the right way to ask this question.

The right way, is for you to post your code, explain why you wrote it the way you did, and ask questions about what you have done wrong.

We are not a homework service. At least show us you are trying, and you will get help.

Cheers.

Dave