2.6. Mapping the Precision Synthesis Design
Mentor Graphics recommends creating an .sdc file and adding this file to the Constraint Files section of the Project Files list. You can create this file with a text editor, by issuing command-line constraint parameters, or by directing the Precision Synthesis software to generate the file automatically the first time you synthesize your design. By default, the Precision Synthesis software saves all timing constraints and attributes in two files: precision_rtl.sdc and precision_tech.sdc. The precision_rtl.sdc file contains constraints set on the RTL-level database (post-compilation) and the precision_tech.sdc file contains constraints set on the gate-level database (post- synthesis) located in the current implementation directory.
You can also enter constraints at the command line. After adding constraints at the command line, update the .sdc file with the update constraint file command. You can add constraints that change infrequently directly to the HDL source files with HDL attributes or pragmas.
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