Standard Delay Format Output File (.sdo) Definition

An output file (with the extension .sdo), generated by the Intel^® Quartus^® Prime Compiler. The Standard Delay Format is an industry-standard format.

SDF Output Files are automatically generated when you compile a design.

SDF Output Files contain timing delay information that allow you to perform back-annotation for simulation with VHDL simulators that use simulation libraries that are compliant with VITAL version 2.2b and version 3.0 (VITAL 95); back-annotation for simulation in Verilog HDL simulators; and timing analysis and physical synthesis with EDIF simulation and synthesis tools. SDF Output Files that are generated for EDA simulation tools do not contain negative setup and hold times.

The Intel^® Quartus^® Prime Compiler can generate SDF Output Files in SDF version 2.1 or 1.0 format.

The file name of an SDF Output File is the same as the user-defined name for the project or design entity.