Quartus 12. --Analysis and Synthesis Failed- Help Needed

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Hello here is a small program that I wrote in VHDL(please see attachment). Synthesis fails in Quartus with the following error.

Error[10028]: can't resolve multiple constant drivers for net wr_data[]...

Can someone help me with solve it?

Thanks.

Manoj

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It is telling you you have assigned to write_data in two assignments (the combinatorial logic before stste machine then inside state machine).

Which one you want?