Intel® Quartus® Prime Pro Edition User Guide: Scripting

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ID 683432
Date 3/28/2022
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Document Table of Contents
Document Table of Contents x
1. Command Line Scripting 2. Tcl Scripting 3. TCL Commands and Packages 4. Intel® Quartus® Prime Pro Edition User Guide Scripting Archives A. Intel® Quartus® Prime Pro Edition User Guides
1. Command Line Scripting x
1.1. Benefits of Command-Line Executables 1.2. Command-Line Scripting Help 1.3. Project Settings with Command-Line Options 1.4. Compilation with quartus_sh --flow 1.5. Text-Based Report Files 1.6. Using Command-Line Executables in Scripts 1.7. Common Scripting Examples 1.8. The QFlow Script 1.9. Command-Line Scripting Revision History
1.3. Project Settings with Command-Line Options x
1.3.1. Option Precedence
1.4. Compilation with quartus_sh --flow x
1.4.1. Resuming a Compilation with quartus_sh --flow 1.4.2. Temporarily Overriding the Compiler Optimization Mode
1.7. Common Scripting Examples x
1.7.1. Create a Project and Apply Constraints 1.7.2. Check Design File Syntax 1.7.3. Create a Project and Synthesize a Netlist Using Netlist Optimizations 1.7.4. Archive and Restore Projects 1.7.5. Update Memory Contents Without Recompiling 1.7.6. Create Device Configuration Files 1.7.7. Fit a Design Using Multiple Seeds
1.8. The QFlow Script x
1.8.1. --partition Option
2. Tcl Scripting x
2.1. Tool Command Language 2.2. The Intel® Quartus® Prime Tcl Console Window 2.3. Intel® Quartus® Prime Tcl Packages 2.4. Tcl Design Flow Controls 2.5. Automating Script Execution 2.6. Other Scripting Features 2.7. The Intel® Quartus® Prime Tcl Shell in Interactive Mode Example 2.8. The tclsh Shell 2.9. Tcl Scripting Basic Examples 2.10. Tcl Scripting Revision History
2.3. Intel® Quartus® Prime Tcl Packages x
2.3.1. Loading Tcl Packages 2.3.2. Intel® Quartus® Prime Tcl API Help
2.3.2. Intel® Quartus® Prime Tcl API Help x
2.3.2.1. Command-Line Options
2.3.2.1. Command-Line Options x
2.3.2.1.1. Run a Tcl Script 2.3.2.1.2. Interactive Shell Mode 2.3.2.1.3. Evaluate as Tcl
2.4. Tcl Design Flow Controls x
2.4.1. Creating Projects and Making Assignments 2.4.2. Compiling Designs 2.4.3. Reporting 2.4.4. Timing Analysis
2.4.2. Compiling Designs x
2.4.2.1. The flow Package 2.4.2.2. Compile All Revisions
2.4.3. Reporting x
2.4.3.1. Saving Report Data in csv Format
2.5. Automating Script Execution x
2.5.1. Execution Example 2.5.2. Controlling Processing 2.5.3. Displaying Messages
2.6. Other Scripting Features x
2.6.1. Natural Bus Naming 2.6.2. Short Option Names 2.6.3. Collection Commands 2.6.4. Node Finder Commands 2.6.5. The get_names Command 2.6.6. The post_message Command 2.6.7. Accessing Command-Line Arguments 2.6.8. The quartus() Array
2.6.3. Collection Commands x
2.6.3.1. The foreach_in_collection Command 2.6.3.2. The get_collection_size Command
2.6.4. Node Finder Commands x
2.6.4.1. Design Entry (all names) Filter 2.6.4.2. Pins: assigned Filter 2.6.4.3. Pins: unassigned Filter 2.6.4.4. Pins: input Filter 2.6.4.5. Pins: output Filter 2.6.4.6. Pins: bidirectional Filter 2.6.4.7. Pins: virtual Filter 2.6.4.8. Pins: all Filter 2.6.4.9. Pins: all & Registers: post-fitting Filter 2.6.4.10. Ports: partition 2.6.4.11. Entity instance: pre-synthesis Filter 2.6.4.12. Registers: pre-synthesis Filter 2.6.4.13. Registers: post-fitting Filter 2.6.4.14. Post-synthesis Filter 2.6.4.15. Post-Compilation Filter 2.6.4.16. Signal Tap: pre-synthesis Filter 2.6.4.17. Signal Tap: post-fitting Filter
2.6.7. Accessing Command-Line Arguments x
2.6.7.1. The cmdline Package
2.9. Tcl Scripting Basic Examples x
2.9.1. Hello World Example 2.9.2. Variables 2.9.3. Substitutions 2.9.4. Arithmetic 2.9.5. Lists 2.9.6. Arrays 2.9.7. Control Structures 2.9.8. Procedures 2.9.9. File I/O 2.9.10. Syntax and Comments 2.9.11. External References
2.9.3. Substitutions x
2.9.3.1. Variable Value Substitution 2.9.3.2. Nested Command Substitution 2.9.3.3. Backslash Substitution
3. TCL Commands and Packages x
TCL Commands and Packages Summary 3.2. Tcl Commands and Packages Revision History
TCL Commands and Packages Summary x
3.1.1. ::quartus::backannotate 3.1.2. ::quartus::bpps 3.1.3. ::quartus::chip_planner 3.1.43.1.4.3. ::quartus::dcmd_dms 3.1.53.1.5.12. ::quartus::dcmd_sdc 3.1.63.1.6.7. ::quartus::dcmd_sdc_collection_api 3.1.7. ::quartus::design 3.1.8. ::quartus::device 3.1.9. ::quartus::dni_sdc 3.1.10. ::quartus::drc 3.1.11. ::quartus::eco 3.1.12. ::quartus::external_memif_toolkit 3.1.13. ::quartus::fif 3.1.14. ::quartus::flng 3.1.15. ::quartus::flow 3.1.163.1.16.1. Example of a Tcl Script 3.1.17. ::quartus::insystem_memory_edit 3.1.18. ::quartus::insystem_source_probe 3.1.19. ::quartus::interactive_synthesis 3.1.20. ::quartus::ipdrc 3.1.21. ::quartus::ipgen 3.1.22. ::quartus::iptclgen 3.1.23. ::quartus::jtag 3.1.24. ::quartus::logic_analyzer_interface 3.1.25. ::quartus::misc 3.1.26. ::quartus::names 3.1.27. ::quartus::periph 3.1.28. ::quartus::pfg 3.1.29. ::quartus::project 3.1.30. ::quartus::qmtf 3.1.31. ::quartus::qshm 3.1.32. ::quartus::report 3.1.33. ::quartus::sdc 3.1.34. ::quartus::sdc_ext 3.1.35. ::quartus::sta 3.1.36. ::quartus::stp 3.1.37. ::quartus::tdc 3.1.38. ::quartus::uno
3.1.1. ::quartus::backannotate x
3.1.1.1. get_back_annotation_assignments (::quartus::backannotate) 3.1.1.2. logiclock_back_annotate (::quartus::backannotate)
3.1.2. ::quartus::bpps x
3.1.2.1. bpps::apply_assignments (::quartus::bpps) 3.1.2.2. bpps::check_plan (::quartus::bpps) 3.1.2.3. bpps::export_constraints_to_qsf (::quartus::bpps) 3.1.2.4. bpps::get_cell_info (::quartus::bpps) 3.1.2.5. bpps::get_device (::quartus::bpps) 3.1.2.6. bpps::get_hdbpath_from_id (::quartus::bpps) 3.1.2.7. bpps::get_id_from_hdbpath (::quartus::bpps) 3.1.2.8. bpps::get_location_info (::quartus::bpps) 3.1.2.9. bpps::get_placement (::quartus::bpps) 3.1.2.10. bpps::get_placement_info (::quartus::bpps) 3.1.2.11. bpps::get_placements (::quartus::bpps) 3.1.2.12. bpps::get_placements_of_group (::quartus::bpps) 3.1.2.13. bpps::harden_cell (::quartus::bpps) 3.1.2.14. bpps::harden_cells (::quartus::bpps) 3.1.2.15. bpps::initialize (::quartus::bpps) 3.1.2.16. bpps::load_floorplan (::quartus::bpps) 3.1.2.17. bpps::place_cells (::quartus::bpps) 3.1.2.18. bpps::read_tpl_placement (::quartus::bpps) 3.1.2.19. bpps::remove_invalid_reports (::quartus::bpps) 3.1.2.20. bpps::report_all (::quartus::bpps) 3.1.2.21. bpps::report_cell_connectivity (::quartus::bpps) 3.1.2.22. bpps::report_cell_placement_reasons (::quartus::bpps) 3.1.2.23. bpps::report_cells (::quartus::bpps) 3.1.2.24. bpps::report_clocks (::quartus::bpps) 3.1.2.25. bpps::report_legal_cell_locations (::quartus::bpps) 3.1.2.26. bpps::report_location_types (::quartus::bpps) 3.1.2.27. bpps::report_locations (::quartus::bpps) 3.1.2.28. bpps::report_regions (::quartus::bpps) 3.1.2.29. bpps::report_summary (::quartus::bpps) 3.1.2.30. bpps::reset_plan (::quartus::bpps) 3.1.2.31. bpps::save_floorplan (::quartus::bpps) 3.1.2.32. bpps::save_pin_assignments (::quartus::bpps) 3.1.2.33. bpps::select_dr_ips (::quartus::bpps) 3.1.2.34. bpps::set_mode (::quartus::bpps) 3.1.2.35. bpps::shutdown (::quartus::bpps) 3.1.2.36. bpps::soften_cell (::quartus::bpps) 3.1.2.37. bpps::soften_cells (::quartus::bpps) 3.1.2.38. bpps::undo_last_placement (::quartus::bpps) 3.1.2.39. bpps::unplace_cells (::quartus::bpps) 3.1.2.40. bpps::update_pdpw (::quartus::bpps) 3.1.2.41. bpps::validate_placement (::quartus::bpps) 3.1.2.42. bpps::write_plan (::quartus::bpps) 3.1.2.43. bpps::write_tpl_placement (::quartus::bpps)
3.1.3. ::quartus::chip_planner x
3.1.3.1. check_node (::quartus::chip_planner) 3.1.3.2. close_chip_planner (::quartus::chip_planner) 3.1.3.3. design_has_ace_support (::quartus::chip_planner) 3.1.3.4. design_has_encrypted_ip (::quartus::chip_planner) 3.1.3.5. get_info_parameters (::quartus::chip_planner) 3.1.3.6. get_iports (::quartus::chip_planner) 3.1.3.7. get_node_by_name (::quartus::chip_planner) 3.1.3.8. get_oports (::quartus::chip_planner) 3.1.3.9. get_port_by_type (::quartus::chip_planner) 3.1.3.10. get_sp_pin_list (::quartus::chip_planner) 3.1.3.11. get_tile_power_setting (::quartus::chip_planner) 3.1.3.12. read_netlist (::quartus::chip_planner) 3.1.3.13. set_batch_mode (::quartus::chip_planner)
3.1.43.1.4.3. ::quartus::dcmd_dms x
3.1.4.1. dni::apply_constraints (::quartus::dcmd_dms) 3.1.4.2. dni::color (::quartus::dcmd_dms) 3.1.43.1.4.3. ::quartus::dcmd_dms 3.1.4.4. dni::get_property (::quartus::dcmd_dms) 3.1.4.5. dni::highlight (::quartus::dcmd_dms) 3.1.4.6. dni::is_dni_mode (::quartus::dcmd_dms) 3.1.4.7. dni::is_dni_mode_for_developer_testing (::quartus::dcmd_dms) 3.1.4.8. dni::list_properties (::quartus::dcmd_dms) 3.1.4.9. dni::load_design (::quartus::dcmd_dms) 3.1.4.10. dni::selection (::quartus::dcmd_dms) 3.1.4.11. dni::set_property (::quartus::dcmd_dms) 3.1.4.12. dni::unload_design (::quartus::dcmd_dms)
3.1.53.1.5.12. ::quartus::dcmd_sdc x
3.1.5.1. dni::all_inputs (::quartus::dcmd_sdc) 3.1.5.2. dni::all_outputs (::quartus::dcmd_sdc) 3.1.5.3. dni::create_clock (::quartus::dcmd_sdc) 3.1.5.4. dni::current_design (::quartus::dcmd_sdc) 3.1.5.5. dni::current_instance (::quartus::dcmd_sdc) 3.1.5.6. dni::get_cells (::quartus::dcmd_sdc) 3.1.5.7. dni::get_designs (::quartus::dcmd_sdc) 3.1.5.8. dni::get_nets (::quartus::dcmd_sdc) 3.1.5.9. dni::get_pins (::quartus::dcmd_sdc) 3.1.5.10. dni::get_ports (::quartus::dcmd_sdc) 3.1.5.11. dni::read_sdc (::quartus::dcmd_sdc) 3.1.53.1.5.12. ::quartus::dcmd_sdc 3.1.5.13. dni::set_time_format (::quartus::dcmd_sdc) 3.1.5.14. dni::set_time_unit (::quartus::dcmd_sdc) 3.1.5.15. dni::write_sdc (::quartus::dcmd_sdc)
3.1.63.1.6.7. ::quartus::dcmd_sdc_collection_api x
3.1.6.1. dni::add_to_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.2. dni::append_to_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.3. dni::copy_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.4. dni::filter_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.5. dni::index_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.6. dni::remove_from_collection (::quartus::dcmd_sdc_collection_api) 3.1.63.1.6.7. ::quartus::dcmd_sdc_collection_api 3.1.6.8. dni::sizeof_collection (::quartus::dcmd_sdc_collection_api) 3.1.6.9. dni::sort_collection (::quartus::dcmd_sdc_collection_api)
3.1.7. ::quartus::design x
3.1.7.1. design::commit_design (::quartus::design) 3.1.7.2. design::convert_partition (::quartus::design) 3.1.7.3. design::create_assignment (::quartus::design) 3.1.7.4. design::delete_assignments (::quartus::design) 3.1.7.5. design::disable_assignments (::quartus::design) 3.1.7.6. design::enable_assignments (::quartus::design) 3.1.7.7. design::export_design (::quartus::design) 3.1.7.8. design::export_partition (::quartus::design) 3.1.7.9. design::extract_metadata (::quartus::design) 3.1.7.10. design::get_assignment_info (::quartus::design) 3.1.7.11. design::get_assignment_names (::quartus::design) 3.1.7.12. design::get_assignments (::quartus::design) 3.1.7.13. design::get_entity_names (::quartus::design) 3.1.7.14. design::get_instances (::quartus::design) 3.1.7.15. design::import_design (::quartus::design) 3.1.7.16. design::import_partition (::quartus::design) 3.1.7.17. design::list_valid_snapshot_names (::quartus::design) 3.1.7.18. design::load_design (::quartus::design) 3.1.7.19. design::report_assignments (::quartus::design) 3.1.7.20. design::set_assignment_info (::quartus::design)
3.1.8. ::quartus::device x
3.1.8.1. get_family_list (::quartus::device) 3.1.8.2. get_part_info (::quartus::device) 3.1.8.3. get_part_list (::quartus::device) 3.1.8.4. report_device_info (::quartus::device) 3.1.8.5. report_family_info (::quartus::device) 3.1.8.6. report_part_info (::quartus::device)
3.1.9. ::quartus::dni_sdc x
3.1.9.1. dni::create_generated_clock (::quartus::dni_sdc) 3.1.9.2. dni::remove_clock_groups (::quartus::dni_sdc) 3.1.9.3. dni::remove_clock_latency (::quartus::dni_sdc) 3.1.9.4. dni::remove_clock_uncertainty (::quartus::dni_sdc) 3.1.9.5. dni::remove_disable_timing (::quartus::dni_sdc) 3.1.9.6. dni::remove_input_delay (::quartus::dni_sdc) 3.1.9.7. dni::remove_output_delay (::quartus::dni_sdc) 3.1.9.8. dni::set_clock_groups (::quartus::dni_sdc) 3.1.9.9. dni::set_clock_latency (::quartus::dni_sdc) 3.1.9.10. dni::set_clock_uncertainty (::quartus::dni_sdc) 3.1.9.11. dni::set_disable_timing (::quartus::dni_sdc) 3.1.9.12. dni::set_false_path (::quartus::dni_sdc) 3.1.9.13. dni::set_input_delay (::quartus::dni_sdc) 3.1.9.14. dni::set_input_transition (::quartus::dni_sdc) 3.1.9.15. dni::set_max_delay (::quartus::dni_sdc) 3.1.9.16. dni::set_max_time_borrow (::quartus::dni_sdc) 3.1.9.17. dni::set_min_delay (::quartus::dni_sdc) 3.1.9.18. dni::set_multicycle_path (::quartus::dni_sdc) 3.1.9.19. dni::set_operating_conditions (::quartus::dni_sdc) 3.1.9.20. dni::set_output_delay (::quartus::dni_sdc) 3.1.9.21. dni::set_sense (::quartus::dni_sdc) 3.1.9.22. dni::set_timing_derate (::quartus::dni_sdc)
3.1.10. ::quartus::drc x
3.1.10.1. drc::add_check_op (::quartus::drc) 3.1.10.2. drc::add_check_parameter (::quartus::drc) 3.1.10.3. drc::add_object (::quartus::drc) 3.1.10.4. drc::add_object_with_properties (::quartus::drc) 3.1.10.5. drc::add_property (::quartus::drc) 3.1.10.6. drc::add_rule (::quartus::drc) 3.1.10.7. drc::add_rule_violation (::quartus::drc) 3.1.10.8. drc::add_violation_record (::quartus::drc) 3.1.10.9. drc::add_waiver (::quartus::drc) 3.1.10.10. drc::check_design (::quartus::drc) 3.1.10.11. drc::delete_waivers (::quartus::drc) 3.1.10.12. drc::get_objects (::quartus::drc) 3.1.10.13. drc::get_option (::quartus::drc) 3.1.10.14. drc::get_property (::quartus::drc) 3.1.10.15. drc::get_stage_info (::quartus::drc) 3.1.10.16. drc::get_waivers (::quartus::drc) 3.1.10.17. drc::list_properties (::quartus::drc) 3.1.10.18. drc::report_waivers (::quartus::drc) 3.1.10.19. drc::set_option (::quartus::drc) 3.1.10.20. drc::set_property (::quartus::drc) 3.1.10.21. drc::should_run_drc (::quartus::drc) 3.1.10.22. drc::update_check_op (::quartus::drc) 3.1.10.23. drc::update_rule (::quartus::drc)
3.1.11. ::quartus::eco x
3.1.11.1. adjust_pll_refclk (::quartus::eco) 3.1.11.2. create_new_node (::quartus::eco) 3.1.11.3. create_wirelut (::quartus::eco) 3.1.11.4. eco_reroute (::quartus::eco) 3.1.11.5. eco_unload_design (::quartus::eco) 3.1.11.6. fitter_report_timing (::quartus::eco) 3.1.11.7. fitter_timing_summary (::quartus::eco) 3.1.11.8. get_available_snapshots (::quartus::eco) 3.1.11.9. get_eco_checkpoint (::quartus::eco) 3.1.11.10. get_loaded_snapshot (::quartus::eco) 3.1.11.11. get_lutmask_equation (::quartus::eco) 3.1.11.12. get_node_location (::quartus::eco) 3.1.11.13. make_connection (::quartus::eco) 3.1.11.14. modify_io_current_strength (::quartus::eco) 3.1.11.15. modify_io_delay_chain (::quartus::eco) 3.1.11.16. modify_io_slew_rate (::quartus::eco) 3.1.11.17. modify_lutmask (::quartus::eco) 3.1.11.18. place_node (::quartus::eco) 3.1.11.19. remove_connection (::quartus::eco) 3.1.11.20. remove_node (::quartus::eco) 3.1.11.21. report_connections (::quartus::eco) 3.1.11.22. report_legal_locations (::quartus::eco) 3.1.11.23. report_nodes_at_location (::quartus::eco) 3.1.11.24. eco::report_partitions (::quartus::eco) 3.1.11.25. report_ports (::quartus::eco) 3.1.11.26. report_routing (::quartus::eco) 3.1.11.27. report_unplaced_nodes (::quartus::eco) 3.1.11.28. restore_eco_checkpoint (::quartus::eco) 3.1.11.29. unplace_node (::quartus::eco) 3.1.11.30. update_mif_files (::quartus::eco)
3.1.12. ::quartus::external_memif_toolkit x
3.1.12.1. apply_setting (::quartus::external_memif_toolkit) 3.1.12.2. calibrate_termination (::quartus::external_memif_toolkit) 3.1.12.3. configure_driver (::quartus::external_memif_toolkit) 3.1.12.4. create_connection_report (::quartus::external_memif_toolkit) 3.1.12.5. create_toolkit_report (::quartus::external_memif_toolkit) 3.1.12.6. driver_margining (::quartus::external_memif_toolkit) 3.1.12.7. establish_connection (::quartus::external_memif_toolkit) 3.1.12.8. generate_eye_diagram (::quartus::external_memif_toolkit) 3.1.12.9. get_connection_commands (::quartus::external_memif_toolkit) 3.1.12.10. get_connection_info (::quartus::external_memif_toolkit) 3.1.12.11. get_connection_interfaces (::quartus::external_memif_toolkit) 3.1.12.12. get_connection_report_info (::quartus::external_memif_toolkit) 3.1.12.13. get_connection_report_types (::quartus::external_memif_toolkit) 3.1.12.14. get_connection_types (::quartus::external_memif_toolkit) 3.1.12.15. get_connections (::quartus::external_memif_toolkit) 3.1.12.16. get_setting_types (::quartus::external_memif_toolkit) 3.1.12.17. get_toolkit_report_types (::quartus::external_memif_toolkit) 3.1.12.18. initialize_connections (::quartus::external_memif_toolkit) 3.1.12.19. link_project_to_device (::quartus::external_memif_toolkit) 3.1.12.20. read_setting (::quartus::external_memif_toolkit) 3.1.12.21. reindex_connections (::quartus::external_memif_toolkit) 3.1.12.22. reset_tg2 (::quartus::external_memif_toolkit) 3.1.12.23. run_connection_command (::quartus::external_memif_toolkit) 3.1.12.24. set_active_interface (::quartus::external_memif_toolkit) 3.1.12.25. set_stress_pattern (::quartus::external_memif_toolkit) 3.1.12.26. terminate_connection (::quartus::external_memif_toolkit) 3.1.12.27. terminate_connections (::quartus::external_memif_toolkit) 3.1.12.28. unlink_project_from_device (::quartus::external_memif_toolkit) 3.1.12.29. write_connection_target_report (::quartus::external_memif_toolkit)
3.1.13. ::quartus::fif x
3.1.13.1. check (::quartus::fif) 3.1.13.2. dump (::quartus::fif) 3.1.13.3. dump_cram_frame (::quartus::fif) 3.1.13.4. dump_mem (::quartus::fif) 3.1.13.5. dump_pr_bitstream (::quartus::fif) 3.1.13.6. generate (::quartus::fif) 3.1.13.7. get_frame_count (::quartus::fif) 3.1.13.8. get_frame_size (::quartus::fif) 3.1.13.9. get_sector_information_sdm_based_fpga (::quartus::fif) 3.1.13.10. get_sensitive_location (::quartus::fif) 3.1.13.11. get_sensitive_location_sdm_based_fpga (::quartus::fif) 3.1.13.12. setup (::quartus::fif) 3.1.13.13. setup_sdm_based_fpga (::quartus::fif) 3.1.13.14. terminate (::quartus::fif)
3.1.14. ::quartus::flng x
3.1.14.1. flng::add_object (::quartus::flng) 3.1.14.2. flng::add_property (::quartus::flng) 3.1.14.3. flng::bind_flow (::quartus::flng) 3.1.14.4. flng::delete_object (::quartus::flng) 3.1.14.5. flng::get_flow_list (::quartus::flng) 3.1.14.6. flng::get_next_available_id (::quartus::flng) 3.1.14.7. flng::get_object (::quartus::flng) 3.1.14.8. flng::get_objects (::quartus::flng) 3.1.14.9. flng::get_option (::quartus::flng) 3.1.14.10. flng::get_property (::quartus::flng) 3.1.14.11. flng::get_task_command (::quartus::flng) 3.1.14.12. flng::init_repository (::quartus::flng) 3.1.14.13. flng::list_properties (::quartus::flng) 3.1.14.14. flng::monitor_flow (::quartus::flng) 3.1.14.15. flng::run_flow (::quartus::flng) 3.1.14.16. flng::run_flow_command (::quartus::flng) 3.1.14.17. flng::set_option (::quartus::flng) 3.1.14.18. flng::set_property (::quartus::flng)
3.1.15. ::quartus::flow x
3.1.15.1. execute_flow (::quartus::flow) 3.1.15.2. execute_module (::quartus::flow) 3.1.15.3. get_flow_templates (::quartus::flow) 3.1.15.4. get_status_db_property (::quartus::flow) 3.1.15.5. write_flow_assignment_digest (::quartus::flow) 3.1.15.6. write_flow_finished (::quartus::flow) 3.1.15.7. write_flow_started (::quartus::flow) 3.1.15.8. write_flow_template (::quartus::flow)
3.1.163.1.16.1. Example of a Tcl Script x
3.1.163.1.16.1. Example of a Tcl Script
3.1.17. ::quartus::insystem_memory_edit x
3.1.17.1. begin_memory_edit (::quartus::insystem_memory_edit) 3.1.17.2. end_memory_edit (::quartus::insystem_memory_edit) 3.1.17.3. get_editable_mem_instances (::quartus::insystem_memory_edit) 3.1.17.4. read_content_from_memory (::quartus::insystem_memory_edit) 3.1.17.5. save_content_from_memory_to_file (::quartus::insystem_memory_edit) 3.1.17.6. update_content_to_memory_from_file (::quartus::insystem_memory_edit) 3.1.17.7. write_content_to_memory (::quartus::insystem_memory_edit)
3.1.18. ::quartus::insystem_source_probe x
3.1.18.1. end_insystem_source_probe (::quartus::insystem_source_probe) 3.1.18.2. get_insystem_source_probe_instance_info (::quartus::insystem_source_probe) 3.1.18.3. read_probe_data (::quartus::insystem_source_probe) 3.1.18.4. read_source_data (::quartus::insystem_source_probe) 3.1.18.5. start_insystem_source_probe (::quartus::insystem_source_probe) 3.1.18.6. write_source_data (::quartus::insystem_source_probe)
3.1.19. ::quartus::interactive_synthesis x
3.1.19.1. analyze_files (::quartus::interactive_synthesis) 3.1.19.2. check_rtl_connections (::quartus::interactive_synthesis) 3.1.19.3. dissolve_rtl_partition (::quartus::interactive_synthesis) 3.1.19.4. dynamic_report (::quartus::interactive_synthesis) 3.1.19.5. elaborate (::quartus::interactive_synthesis) 3.1.19.6. get_entities (::quartus::interactive_synthesis) 3.1.19.7. get_rtl_partition_name (::quartus::interactive_synthesis) 3.1.19.8. get_rtl_partitions (::quartus::interactive_synthesis) 3.1.19.9. link_rtl_design (::quartus::interactive_synthesis) 3.1.19.10. print_ipxact (::quartus::interactive_synthesis) 3.1.19.11. report_rtl_assignments (::quartus::interactive_synthesis) 3.1.19.12. report_rtl_parameters (::quartus::interactive_synthesis) 3.1.19.13. report_rtl_stats (::quartus::interactive_synthesis) 3.1.19.14. reset_rtl_design (::quartus::interactive_synthesis) 3.1.19.15. sasic (::quartus::interactive_synthesis) 3.1.19.16. save_rtl_design (::quartus::interactive_synthesis) 3.1.19.17. synthesize (::quartus::interactive_synthesis) 3.1.19.18. uniquify (::quartus::interactive_synthesis) 3.1.19.19. write_rtl_report (::quartus::interactive_synthesis)
3.1.20. ::quartus::ipdrc x
3.1.20.1. ipdrc::get_device_speed (::quartus::ipdrc) 3.1.20.2. ipdrc::get_ip_hpaths (::quartus::ipdrc) 3.1.20.3. ipdrc::get_ip_name (::quartus::ipdrc) 3.1.20.4. ipdrc::get_ip_pma_modulation (::quartus::ipdrc) 3.1.20.5. ipdrc::get_ip_speed (::quartus::ipdrc) 3.1.20.6. ipdrc::get_ip_type (::quartus::ipdrc) 3.1.20.7. ipdrc::get_ip_xcvr_type (::quartus::ipdrc) 3.1.20.8. ipdrc::set_ip_info (::quartus::ipdrc)
3.1.21. ::quartus::ipgen x
3.1.21.1. clear_ip_generation_dirs (::quartus::ipgen) 3.1.21.2. generate_ip_file (::quartus::ipgen) 3.1.21.3. generate_project_ip_files (::quartus::ipgen) 3.1.21.4. get_project_ip_files (::quartus::ipgen)
3.1.22. ::quartus::iptclgen x
3.1.22.1. compute_pll (::quartus::iptclgen) 3.1.22.2. generate_vhdl_simgen_model (::quartus::iptclgen) 3.1.22.3. parse_hdl (::quartus::iptclgen) 3.1.22.4. parse_tcl (::quartus::iptclgen)
3.1.23. ::quartus::jtag x
3.1.23.1. close_device (::quartus::jtag) 3.1.23.2. device_dr_shift (::quartus::jtag) 3.1.23.3. device_ir_shift (::quartus::jtag) 3.1.23.4. device_lock (::quartus::jtag) 3.1.23.5. device_run_test_idle (::quartus::jtag) 3.1.23.6. device_unlock (::quartus::jtag) 3.1.23.7. device_virtual_dr_shift (::quartus::jtag) 3.1.23.8. device_virtual_ir_shift (::quartus::jtag) 3.1.23.9. get_device_names (::quartus::jtag) 3.1.23.10. get_hardware_names (::quartus::jtag) 3.1.23.11. open_device (::quartus::jtag)
3.1.24. ::quartus::logic_analyzer_interface x
3.1.24.1. begin_logic_analyzer_interface_control (::quartus::logic_analyzer_interface) 3.1.24.2. change_bank_to_output_pin (::quartus::logic_analyzer_interface) 3.1.24.3. end_logic_analyzer_interface_control (::quartus::logic_analyzer_interface) 3.1.24.4. get_current_state_of_output_pin (::quartus::logic_analyzer_interface) 3.1.24.5. tristate_output_pin (::quartus::logic_analyzer_interface)
3.1.25. ::quartus::misc x
3.1.25.1. checksum (::quartus::misc) 3.1.25.2. disable_natural_bus_naming (::quartus::misc) 3.1.25.3. enable_natural_bus_naming (::quartus::misc) 3.1.25.4. escape_brackets (::quartus::misc) 3.1.25.5. foreach_in_collection (::quartus::misc) 3.1.25.6. get_collection_size (::quartus::misc) 3.1.25.7. get_environment_info (::quartus::misc) 3.1.25.8. get_message_count (::quartus::misc) 3.1.25.9. init_tk (::quartus::misc) 3.1.25.10. load (::quartus::misc) 3.1.25.11. load_package (::quartus::misc) 3.1.25.12. post_message (::quartus::misc) 3.1.25.13. qerror (::quartus::misc) 3.1.25.14. qexec (::quartus::misc) 3.1.25.15. qexit (::quartus::misc) 3.1.25.16. record_tcl_cmd (::quartus::misc) 3.1.25.17. stopwatch (::quartus::misc)
3.1.26. ::quartus::names x
3.1.26.1. get_assignment (::quartus::names) 3.1.26.2. set_assignment (::quartus::names)
3.1.27. ::quartus::periph x
3.1.27.1. periph::check_plan (::quartus::periph) 3.1.27.2. periph::get_cell_info (::quartus::periph) 3.1.27.3. periph::get_cells (::quartus::periph) 3.1.27.4. periph::get_location_info (::quartus::periph) 3.1.27.5. periph::get_placement_info (::quartus::periph) 3.1.27.6. periph::get_placements (::quartus::periph) 3.1.27.7. blueprint::initialize (::quartus::periph) 3.1.27.8. periph::load_floorplan (::quartus::periph) 3.1.27.9. periph::place_cells (::quartus::periph) 3.1.27.10. periph::remove_invalid_reports (::quartus::periph) 3.1.27.11. periph::report_all (::quartus::periph) 3.1.27.12. periph::report_cell_connectivity (::quartus::periph) 3.1.27.13. periph::report_cell_placement_reasons (::quartus::periph) 3.1.27.14. periph::report_cells (::quartus::periph) 3.1.27.15. periph::report_clocks (::quartus::periph) 3.1.27.16. periph::report_legal_cell_locations (::quartus::periph) 3.1.27.17. periph::report_location_types (::quartus::periph) 3.1.27.18. periph::report_locations (::quartus::periph) 3.1.27.19. periph::report_regions (::quartus::periph) 3.1.27.20. periph::report_summary (::quartus::periph) 3.1.27.21. periph::reset_plan (::quartus::periph) 3.1.27.22. periph::save_floorplan (::quartus::periph) 3.1.27.23. periph::set_clock_type (::quartus::periph) 3.1.27.24. blueprint::shutdown (::quartus::periph) 3.1.27.25. periph::undo_last_placement (::quartus::periph) 3.1.27.26. periph::unplace_cells (::quartus::periph) 3.1.27.27. periph::update_pdpw (::quartus::periph) 3.1.27.28. periph::update_plan (::quartus::periph) 3.1.27.29. periph::write_plan (::quartus::periph)
3.1.28. ::quartus::pfg x
3.1.28.1. test (::quartus::pfg)
3.1.29. ::quartus::project x
3.1.29.1. assignment_group (::quartus::project) 3.1.29.2. close_side_revision (::quartus::project) 3.1.29.3. create_base_clock (::quartus::project) 3.1.29.4. create_relative_clock (::quartus::project) 3.1.29.5. create_revision (::quartus::project) 3.1.29.6. delete_revision (::quartus::project) 3.1.29.7. execute_assignment_batch (::quartus::project) 3.1.29.8. export_assignments (::quartus::project) 3.1.29.9. get_all_assignment_names (::quartus::project) 3.1.29.10. get_all_assignments (::quartus::project) 3.1.29.11. get_all_global_assignments (::quartus::project) 3.1.29.12. get_all_instance_assignments (::quartus::project) 3.1.29.13. get_all_parameters (::quartus::project) 3.1.29.14. get_all_quartus_defaults (::quartus::project) 3.1.29.15. get_all_user_option_names (::quartus::project) 3.1.29.16. get_assignment_info (::quartus::project) 3.1.29.17. get_assignment_name_info (::quartus::project) 3.1.29.18. get_current_project (::quartus::project) 3.1.29.19. get_current_revision (::quartus::project) 3.1.29.20. get_database_version (::quartus::project) 3.1.29.21. get_global_assignment (::quartus::project) 3.1.29.22. get_instance_assignment (::quartus::project) 3.1.29.23. get_location_assignment (::quartus::project) 3.1.29.24. get_name_info (::quartus::project) 3.1.29.25. get_names (::quartus::project) 3.1.29.26. get_parameter (::quartus::project) 3.1.29.27. get_project_directory (::quartus::project) 3.1.29.28. get_project_revisions (::quartus::project) 3.1.29.29. get_project_settings (::quartus::project) 3.1.29.30. get_top_level_entity (::quartus::project) 3.1.29.31. get_user_option (::quartus::project) 3.1.29.32. is_database_version_compatible (::quartus::project) 3.1.29.33. is_fitter_in_qhd_mode (::quartus::project) 3.1.29.34. is_project_open (::quartus::project) 3.1.29.35. open_side_revision (::quartus::project) 3.1.29.36. project_archive (::quartus::project) 3.1.29.37. project_clean (::quartus::project) 3.1.29.38. project_close (::quartus::project) 3.1.29.39. project_exists (::quartus::project) 3.1.29.40. project_new (::quartus::project) 3.1.29.41. project_open (::quartus::project) 3.1.29.42. project_restore (::quartus::project) 3.1.29.43. project_settings_exist (::quartus::project) 3.1.29.44. remove_all_global_assignments (::quartus::project) 3.1.29.45. remove_all_instance_assignments (::quartus::project) 3.1.29.46. remove_all_parameters (::quartus::project) 3.1.29.47. resolve_file_path (::quartus::project) 3.1.29.48. revision_exists (::quartus::project) 3.1.29.49. set_current_revision (::quartus::project) 3.1.29.50. set_global_assignment (::quartus::project) 3.1.29.51. set_high_effort_fmax_optimization_assignments (::quartus::project) 3.1.29.52. set_instance_assignment (::quartus::project) 3.1.29.53. set_io_assignment (::quartus::project) 3.1.29.54. set_location_assignment (::quartus::project) 3.1.29.55. set_multicycle_assignment (::quartus::project) 3.1.29.56. set_parameter (::quartus::project) 3.1.29.57. set_power_file_assignment (::quartus::project) 3.1.29.58. set_project_settings (::quartus::project) 3.1.29.59. set_timing_cut_assignment (::quartus::project) 3.1.29.60. set_user_option (::quartus::project) 3.1.29.61. test_assignment_trait (::quartus::project) 3.1.29.62. timegroup (::quartus::project)
3.1.30. ::quartus::qmtf x
3.1.30.1. mtf::test (::quartus::qmtf)
3.1.31. ::quartus::qshm x
3.1.31.1. qshm_connect_to_quartus (::quartus::qshm) 3.1.31.2. qshm_disconnect_from_quartus (::quartus::qshm) 3.1.31.3. qshm_dispose_client (::quartus::qshm) 3.1.31.4. qshm_get_hub_key_prefix (::quartus::qshm) 3.1.31.5. qshm_get_parent_hub_key (::quartus::qshm) 3.1.31.6. qshm_obtain_client (::quartus::qshm) 3.1.31.7. qshm_send_request (::quartus::qshm) 3.1.31.8. qshm_send_server_state_query (::quartus::qshm) 3.1.31.9. qshm_set_context (::quartus::qshm)
3.1.32. ::quartus::report x
3.1.32.1. add_row_to_table (::quartus::report) 3.1.32.2. create_report_panel (::quartus::report) 3.1.32.3. delete_report_panel (::quartus::report) 3.1.32.4. get_fitter_resource_usage (::quartus::report) 3.1.32.5. get_number_of_columns (::quartus::report) 3.1.32.6. get_number_of_rows (::quartus::report) 3.1.32.7. get_report_panel_column_index (::quartus::report) 3.1.32.8. get_report_panel_data (::quartus::report) 3.1.32.9. get_report_panel_id (::quartus::report) 3.1.32.10. get_report_panel_names (::quartus::report) 3.1.32.11. get_report_panel_row (::quartus::report) 3.1.32.12. get_report_panel_row_index (::quartus::report) 3.1.32.13. load_report (::quartus::report) 3.1.32.14. read_xml_report (::quartus::report) 3.1.32.15. refresh_report_window (::quartus::report) 3.1.32.16. save_report_database (::quartus::report) 3.1.32.17. unload_report (::quartus::report) 3.1.32.18. write_report_panel (::quartus::report) 3.1.32.19. write_xml_report (::quartus::report)
3.1.33. ::quartus::sdc x
3.1.33.1. all_clocks (::quartus::sdc) 3.1.33.2. all_inputs (::quartus::sdc) 3.1.33.3. all_outputs (::quartus::sdc) 3.1.33.4. all_registers (::quartus::sdc) 3.1.33.5. create_clock (::quartus::sdc) 3.1.33.6. create_generated_clock (::quartus::sdc) 3.1.33.7. derive_clocks (::quartus::sdc) 3.1.33.8. get_cells (::quartus::sdc) 3.1.33.9. get_clocks (::quartus::sdc) 3.1.33.10. get_nets (::quartus::sdc) 3.1.33.11. get_pins (::quartus::sdc) 3.1.33.12. get_ports (::quartus::sdc) 3.1.33.13. remove_clock_groups (::quartus::sdc) 3.1.33.14. remove_clock_latency (::quartus::sdc) 3.1.33.15. remove_clock_uncertainty (::quartus::sdc) 3.1.33.16. remove_disable_timing (::quartus::sdc) 3.1.33.17. remove_input_delay (::quartus::sdc) 3.1.33.18. remove_output_delay (::quartus::sdc) 3.1.33.19. reset_design (::quartus::sdc) 3.1.33.20. set_clock_groups (::quartus::sdc) 3.1.33.21. set_clock_latency (::quartus::sdc) 3.1.33.22. set_clock_uncertainty (::quartus::sdc) 3.1.33.23. set_disable_timing (::quartus::sdc) 3.1.33.24. set_false_path (::quartus::sdc) 3.1.33.25. set_input_delay (::quartus::sdc) 3.1.33.26. set_input_transition (::quartus::sdc) 3.1.33.27. set_max_delay (::quartus::sdc) 3.1.33.28. set_max_time_borrow (::quartus::sdc) 3.1.33.29. set_min_delay (::quartus::sdc) 3.1.33.30. set_multicycle_path (::quartus::sdc) 3.1.33.31. set_output_delay (::quartus::sdc)
3.1.34. ::quartus::sdc_ext x
3.1.34.1. derive_clock_uncertainty (::quartus::sdc_ext) 3.1.34.2. derive_pll_clocks (::quartus::sdc_ext) 3.1.34.3. disable_min_pulse_width (::quartus::sdc_ext) 3.1.34.4. get_active_clocks (::quartus::sdc_ext) 3.1.34.5. get_assignment_groups (::quartus::sdc_ext) 3.1.34.6. get_fanins (::quartus::sdc_ext) 3.1.34.7. get_fanouts (::quartus::sdc_ext) 3.1.34.8. get_keepers (::quartus::sdc_ext) 3.1.34.9. get_nodes (::quartus::sdc_ext) 3.1.34.10. get_partitions (::quartus::sdc_ext) 3.1.34.11. get_registers (::quartus::sdc_ext) 3.1.34.12. remove_annotated_delay (::quartus::sdc_ext) 3.1.34.13. remove_clock (::quartus::sdc_ext) 3.1.34.14. reset_timing_derate (::quartus::sdc_ext) 3.1.34.15. set_active_clocks (::quartus::sdc_ext) 3.1.34.16. set_annotated_delay (::quartus::sdc_ext) 3.1.34.17. set_data_delay (::quartus::sdc_ext) 3.1.34.18. set_max_skew (::quartus::sdc_ext) 3.1.34.19. set_net_delay (::quartus::sdc_ext) 3.1.34.20. set_scc_mode (::quartus::sdc_ext) 3.1.34.21. set_time_format (::quartus::sdc_ext) 3.1.34.22. set_timing_derate (::quartus::sdc_ext)
3.1.35. ::quartus::sta x
3.1.35.1. add_to_collection (::quartus::sta) 3.1.35.2. check_timing (::quartus::sta) 3.1.35.3. create_report_histogram (::quartus::sta) 3.1.35.4. create_slack_histogram (::quartus::sta) 3.1.35.5. create_timing_netlist (::quartus::sta) 3.1.35.6. create_timing_summary (::quartus::sta) 3.1.35.7. delete_sta_collection (::quartus::sta) 3.1.35.8. delete_timing_netlist (::quartus::sta) 3.1.35.9. enable_ccpp_removal (::quartus::sta) 3.1.35.10. enable_sdc_extension_collections (::quartus::sta) 3.1.35.11. get_available_operating_conditions (::quartus::sta) 3.1.35.12. get_cell_info (::quartus::sta) 3.1.35.13. get_clock_domain_info (::quartus::sta) 3.1.35.14. get_clock_fmax_info (::quartus::sta) 3.1.35.15. get_clock_info (::quartus::sta) 3.1.35.16. get_clock_pair_info (::quartus::sta) 3.1.35.17. get_datasheet (::quartus::sta) 3.1.35.18. get_default_sdc_file_names (::quartus::sta) 3.1.35.19. get_edge_info (::quartus::sta) 3.1.35.20. get_entity_instances (::quartus::sta) 3.1.35.21. get_min_pulse_width (::quartus::sta) 3.1.35.22. get_net_info (::quartus::sta) 3.1.35.23. get_node_info (::quartus::sta) 3.1.35.24. get_object_info (::quartus::sta) 3.1.35.25. get_operating_conditions (::quartus::sta) 3.1.35.26. get_operating_conditions_info (::quartus::sta) 3.1.35.27. get_partition_info (::quartus::sta) 3.1.35.28. get_path (::quartus::sta) 3.1.35.29. get_path_info (::quartus::sta) 3.1.35.30. get_pin_info (::quartus::sta) 3.1.35.31. get_point_info (::quartus::sta) 3.1.35.32. get_port_info (::quartus::sta) 3.1.35.33. get_register_info (::quartus::sta) 3.1.35.34. get_timing_paths (::quartus::sta) 3.1.35.35. import_sdc (::quartus::sta) 3.1.35.36. is_post_syn_sta (::quartus::sta) 3.1.35.37. locate (::quartus::sta) 3.1.35.38. print_total_sdc_processing_time (::quartus::sta) 3.1.35.39. query_collection (::quartus::sta) 3.1.35.40. read_sdc (::quartus::sta) 3.1.35.41. register_delete_timing_netlist_callback (::quartus::sta) 3.1.35.42. remove_from_collection (::quartus::sta) 3.1.35.43. report_advanced_io_timing (::quartus::sta) 3.1.35.44. report_asynch_cdc (::quartus::sta) 3.1.35.45. report_bottleneck (::quartus::sta) 3.1.35.46. report_cdc_viewer (::quartus::sta) 3.1.35.47. report_clock_fmax_summary (::quartus::sta) 3.1.35.48. report_clock_network (::quartus::sta) 3.1.35.49. report_clock_transfers (::quartus::sta) 3.1.35.50. report_clocks (::quartus::sta) 3.1.35.51. report_datasheet (::quartus::sta) 3.1.35.52. report_ddr (::quartus::sta) 3.1.35.53. report_exceptions (::quartus::sta) 3.1.35.54. report_ini_usage (::quartus::sta) 3.1.35.55. report_logic_depth (::quartus::sta) 3.1.35.56. report_max_clock_skew (::quartus::sta) 3.1.35.57. report_max_skew (::quartus::sta) 3.1.35.58. report_metastability (::quartus::sta) 3.1.35.59. report_min_pulse_width (::quartus::sta) 3.1.35.60. report_neighbor_paths (::quartus::sta) 3.1.35.61. report_net_delay (::quartus::sta) 3.1.35.62. report_net_timing (::quartus::sta) 3.1.35.63. report_partitions (::quartus::sta) 3.1.35.64. report_path (::quartus::sta) 3.1.35.65. report_pipelining_info (::quartus::sta) 3.1.35.66. report_register_spread (::quartus::sta) 3.1.35.67. report_register_statistics (::quartus::sta) 3.1.35.68. report_retiming_restrictions (::quartus::sta) 3.1.35.69. report_route_net_of_interest (::quartus::sta) 3.1.35.70. report_rskm (::quartus::sta) 3.1.35.71. report_sdc (::quartus::sta) 3.1.35.72. report_skew (::quartus::sta) 3.1.35.73. report_tccs (::quartus::sta) 3.1.35.74. report_timing (::quartus::sta) 3.1.35.75. report_timing_by_source_files (::quartus::sta) 3.1.35.76. report_timing_tree (::quartus::sta) 3.1.35.77. report_ucp (::quartus::sta) 3.1.35.78. set_operating_conditions (::quartus::sta) 3.1.35.79. timing_netlist_exist (::quartus::sta) 3.1.35.80. update_timing_netlist (::quartus::sta) 3.1.35.81. use_timing_analyzer_style_escaping (::quartus::sta) 3.1.35.82. write_sdc (::quartus::sta)
3.1.36. ::quartus::stp x
3.1.36.1. close_session (::quartus::stp) 3.1.36.2. export_data_log (::quartus::stp) 3.1.36.3. open_session (::quartus::stp) 3.1.36.4. run (::quartus::stp) 3.1.36.5. run_multiple_end (::quartus::stp) 3.1.36.6. run_multiple_start (::quartus::stp) 3.1.36.7. stop (::quartus::stp)
3.1.37. ::quartus::tdc x
3.1.37.1. is_place (::quartus::tdc) 3.1.37.2. is_plan (::quartus::tdc) 3.1.37.3. is_post_route (::quartus::tdc)
3.1.38. ::quartus::uno x
3.1.38.1. uno::write_verilog (::quartus::uno)
1. Command Line Scripting
2. Tcl Scripting
3. TCL Commands and Packages
4. Intel® Quartus® Prime Pro Edition User Guide Scripting Archives
A. Intel® Quartus® Prime Pro Edition User Guides

2.9.10. Syntax and Comments

Arguments to Tcl commands are separated by white space, and Tcl commands are terminated by a newline character or a semicolon. You must use backslashes when a Tcl command extends more than one line. The backslash (\) must be the last character in the line to designate line extension. If the backslash is followed by any other character including a space, that character is treated as a literal.

Tcl uses the hash or pound character (#) to begin comments. The # character must begin a comment. If you prefer to include comments on the same line as a command, be sure to terminate the command with a semicolon before the # character. The following example is a valid line of code that includes a set command and a comment. 

set a 1;# Initializes a

Without the semicolon, the command is invalid because the set command does not terminate until the new line after the comment.

The Tcl interpreter counts curly braces inside comments, which can lead to errors that are difficult to track down. The following example causes an error because of unbalanced curly braces. 

# if { $x > 0 } {
if { $y > 0 } {
	# code here
}
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