Altera Quartus II Scripting - Manual (Page 616)

3–486 Chapter 3: Tcl Packages & Commands
timing_assignment
Quartus II Scripting Reference Manual © July 2013 Altera Corporation
Assignments created or modified by using this Tcl command are not saved to the Quartus II Settings File
(.qsf) unless you explicitly call one of the following two Tcl commands:
■ export_assignments
■ project_close (unless "-dont_export_assignments" is specified)
These two Tcl commands reside in the ::quartus::project Tcl package. You must save assignment changes
before you run Quartus®II command-line executables. Note, however, that the Tcl commands
"execute_flow" and "execute_module" (part of the ::quartus::flow Tcl package) automatically call
"export_assignments" before they run command-line executables.
Example
# Specify a clock named "clk50" with
# a 50ns period
# The command specifies a CLOCK section
# in the active project with the 50ns
# specification, and adds a
# "clk50 : CLOCK_SETTING=clk50" assignment
# to the current entity
create_base_clock -fmax 50ns clk50
# Specify the same clk50 to a pin with
# a different name (myclkpin)
create_base_clock -fmax 50ns -target myclkpin clk50
# Specify the entity name to which the clock
# is added, using the -entity option
# This is needed if the top-level entity name
# is other than that of the project
# The following command generates a "top_level" entity.
create_base_clock -fmax 50ns -entity top_level clk50