read_sdc Command

read_sdc <file>

This command reads in the SDC file specified with <file>. If you do not specify a file, the tool loads the SDC file list that you set in your project. The SDC file overrides previous constraints. If a constraint is overwritten by a later constraint, the software issues a warning similar to:

SDC <file name>: <line number>] A clock with name 'Oclk' already exists. Overwriting the previous clock with the same name