New SDC File Command (Timing Analyzer)

You access this command by clicking File > New SDC File in the Timing Analyzer.

Opens the Quartus^® Prime Text Editor, where you can create a new Synopsys Design Constraints File (.sdc) Definition. The Quartus^® Prime Text Editor provides line numbering, syntax coloring, and call tips. You can enter timing constraints and exceptions directly, or specify them with theInsert Constraintcommand.

Table 1. Supported SDC File Types
	SDC-on-RTL	Synthesis-Only SDC	Conventional SDC
Stage where constraints are read	Analysis & Elaboration	Synthesis	Fitter, Signoff
Stage where constraints are processed	Synthesis through Fitter	Synthesis only	Fitter, Signoff
QSF assignment	`RTL_SDC_FILE` (supports entities)	`SDC_FILE SDC_ENTITY_FILE -read_during_post_syn_and_post_fit_timing_analysis` `SDC_ENTITY_FILE -read_during_post_syn_and_not_post_fit_timing_analysis`	`SDC_FILE`
Syntax supported	Tcl with SDC 2.1 commands	Tcl with Quartus^® Prime SDC commands	Tcl with Quartus^® Prime SDC commands
SDC 2.1-compliant	Yes	No	No
Target type	RTL	Quartus^® Prime timing graph	Quartus^® Prime timing graph
Hierarchical targets	Yes	No	No
Buried timing nodes (used by IP)	No	Core fabric only. Note: Such nodes do not exist for the periphery in post-synthesis timing analysis.	Yes
STA command to load constraints	Executes the `read_sdc` or `import_sdc` command in any snapshot.	Executes the `read_sdc` command only during static timing analysis on the synthesized snapshot.	Executes the `read_sdc` command during static timing analysis on any fitter snapshot (plan, place, route, retime). Note: Not loaded during synthesis.

Note:

The Timing Analyzer does not apply constraints and exceptions specified in the Quartus^® Prime Text Editor until you use the Read SDC File command.
If you work with a design using a previous SDC File, and then create a new one, to have the Timing Analyzer re-read the SDC constraints, first use the Reset Design command, and then the Read SDC File command.