final year project help needed in fir design

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can't i do the analysis and sythesis of the package seperage ly of just saving the file add its up to work .all coz every time i compile the design it send top level entity no defined

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You cannot synthesise a package on its own because it contains no entities. You need a top level entity to synthesise.

You might be best sticking the package into modelsim and compiling it there for syntax checking.

Also, please use numeric_std instead of std_logic_arith.