Timequest Report Metastability

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set_instance_assignment -name SYNCHRONIZER_IDENTIFICATION "FORCED IF ASYNCHRONOUS" -to sync[0]

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It would be better to add (embed) this assignment in the HDL source itself, like Altera does in it's own IP. So if you re-use your code (and re-usability is what we need my friend) this is executed automatically!

For Vhdl see: http://quartushelp.altera.com/10.0/mergedprojects/hdl/vhdl/vhdl_file_dir_attribute.htm

For Verilog see: http://quartushelp.altera.com/10.0/mergedprojects/hdl/vlog/vlog_file_dir_attribute.htm