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Synopsys Design Constraints (SDC) format is an industry standard to constrain integrated circuits for synthesis, timing, area, power etc.
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SDC constraints for reusable component
You can specify SDC commands inside of your VHDL code with ALTERA attributes. … The PoC Library is using this to apply relative timing constraints for synchronizers:
architecture rtl of sync_Bits_Altera is
attribute ALTERA_ATTRIBUTE : string;
-- Apply a SDC constraint to meta …