Intel® Quartus® Prime Pro Edition User Guide: Design Constraints

ID 683143
Date 10/04/2021

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1.2.5. Tcl-only Script Flows

As an alternative to .sdc and .qsf files, you can perform all design assignments and timing constraints inside the Tcl scripts. In this case, the script that automates compilation and custom results reporting also contains the design constraints.

You can export a design's contents to a procedural, executable Tcl (.tcl) file, and then use the generated script to restore settings after experimenting with other constraints.

To export your constraints as an executable Tcl script, click Project > Generate Tcl File for Project.

blinking_led_generated.tcl File

# Quartus Prime: Generate Tcl File for Project
# File: blinking_led_generated.tcl
# Generated on: Wed May 10 10:14:44 2017
# Load Quartus Prime Tcl Project package

package require ::quartus::project
set need_to_close_project 0
set make_assignments 1
# Check that the right project is open
if {[is_project_open]} {
  if {[string compare $quartus(project) "blinking_led"]} {
puts "Project blinking_led is not open"
set make_assignments 0
} else {
  # Only open if not already open
  if {[project_exists blinking_led]} {
project_open -revision blinking_led blinking_led
  } else {
project_new -revision blinking_led blinking_led
  set need_to_close_project 1

# Make assignments
if {$make_assignments} {
set_global_assignment -name SYSTEMVERILOG_FILE
set_global_assignment -name SYSTEMVERILOG_FILE
set_global_assignment -name SDC_FILE blinking_led.sdc
set_global_assignment -name SDC_FILE jtag.sdc
set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files
set_global_assignment -name LAST_QUARTUS_VERSION "17.1.0 Pro Edition"
set_global_assignment -name TEXT_FILE blinking_led_generated.txt
set_global_assignment -name FAMILY "Arria 10"
set_global_assignment -name TOP_LEVEL_ENTITY top
set_global_assignment -name DEVICE 10AS066N3F40E2SG
set_location_assignment PIN_AN18 -to clock
set_location_assignment PIN_AR23 -to led_zero_on
set_location_assignment PIN_AM21 -to led_two_on
set_location_assignment PIN_AR22 -to led_one_on
set_location_assignment PIN_AL20 -to led_three_on
set_instance_assignment -name IO_STANDARD "1.8 V" -to led_zero_on
set_instance_assignment -name IO_STANDARD "1.8 V" -to led_one_on
set_instance_assignment -name IO_STANDARD "1.8 V" -to led_two_on
set_instance_assignment -name IO_STANDARD "1.8 V" -to led_three_on
set_instance_assignment -name SLEW_RATE 1 -to led_zero_on
set_instance_assignment -name SLEW_RATE 1 -to led_one_on
set_instance_assignment -name SLEW_RATE 1 -to led_two_on
set_instance_assignment -name SLEW_RATE 1 -to led_three_on
set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to clock
set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to led_zero_on
set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to led_one_on
set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to led_two_on
set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to led_three_on
# Commit assignments
# Close project
if {$need_to_close_project} {

The example:

  • Opens the project
  • Assigns Constraints
  • Writes assignments to QSF file
  • Closes project