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

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ID 683641
Date 4/03/2023
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Document Table of Contents
Document Table of Contents x
1. Answers to Top FAQs 2. Design Optimization Overview 3. Optimizing the Design Netlist 4. Netlist Optimizations and Physical Synthesis 5. Area Optimization 6. Timing Closure and Optimization 7. Analyzing and Optimizing the Design Floorplan 8. Using the ECO Compilation Flow 9. Intel® Quartus® Prime Pro Edition Design Optimization User Guide Archives A. Intel® Quartus® Prime Pro Edition User Guides
2. Design Optimization Overview x
2.1. Initial FPGA Device Considerations 2.2. Initial Compiler Settings 2.3. Optimization Trade-Offs and Limitations 2.4. Design Visualization and Optimization Tools 2.5. Design Optimization Overview Revision History
2.1. Initial FPGA Device Considerations x
2.1.1. Device Migration Considerations
2.2. Initial Compiler Settings x
2.2.1. Initial I/O Assignment Guidelines 2.2.2. Initial Timing Constraint Guidelines
2.3. Optimization Trade-Offs and Limitations x
2.3.1. Area Reduction Trade-Offs 2.3.2. Critical Path Delay Reduction Trade-Offs 2.3.3. Power Consumption Reduction Trade-Offs 2.3.4. Compilation Time Trade-Offs
2.4. Design Visualization and Optimization Tools x
2.4.1. Design Visualization Tools 2.4.2. Design Optimization Tools
3. Optimizing the Design Netlist x
3.1. When to Use the Netlist Viewers: Analyzing Design Problems 3.2. Intel® Quartus® Prime Design Flow with the Netlist Viewers 3.3. RTL Viewer Overview 3.4. Technology Map Viewer Overview 3.5. Netlist Viewer User Interface 3.6. Schematic View 3.7. Cross-Probing to a Source Design File and Other Intel® Quartus® Prime Windows 3.8. Cross-Probing to the Netlist Viewers from Other Intel® Quartus® Prime Windows 3.9. Viewing a Timing Path 3.10. Optimizing the Design Netlist Revision History
3.3. RTL Viewer Overview x
3.3.1. Maximizing Readability in RTL Viewer 3.3.2. Running the RTL Viewer
3.5. Netlist Viewer User Interface x
3.5.1. Netlist Navigator Pane 3.5.2. Properties Pane 3.5.3. Netlist Viewers Find Pane
3.6. Schematic View x
3.6.1. Display Schematics in Multiple Tabbed View 3.6.2. Schematic Symbols 3.6.3. Select Items in the Schematic View 3.6.4. Shortcut Menu Commands in the Schematic View 3.6.5. Filtering in the Schematic View 3.6.6. View Contents of Nodes in the Schematic View 3.6.7. Moving Nodes in the Schematic View 3.6.8. View LUT Representations in the Technology Map Viewer 3.6.9. Zoom Controls 3.6.10. Navigating with the Bird's Eye View 3.6.11. Partition the Schematic into Pages 3.6.12. Follow Nets Across Schematic Pages
4. Netlist Optimizations and Physical Synthesis x
4.1. Physical Synthesis Optimizations 4.2. Applying Netlist Optimizations 4.3. Scripting Support 4.4. Netlist Optimizations and Physical Synthesis Revision History
4.1. Physical Synthesis Optimizations x
4.1.1. Disabling or Enabling Physical Synthesis Optimization 4.1.2. Physical Synthesis Options
4.2. Applying Netlist Optimizations x
4.2.1. WYSIWYG Primitive Resynthesis
4.3. Scripting Support x
4.3.1. Synthesis Netlist Optimizations 4.3.2. Physical Synthesis Optimizations
5. Area Optimization x
5.1. Resource Utilization Information 5.2. Optimizing Resource Utilization 5.3. Scripting Support 5.4. Area Optimization Revision History
5.1. Resource Utilization Information x
5.1.1. Flow Summary Report 5.1.2. Fitter Reports 5.1.3. Design Assistant Recommendations 5.1.4. Analysis and Synthesis Reports 5.1.5. Compilation Messages 5.1.6. Chip Planner Visualization
5.2. Optimizing Resource Utilization x
5.2.1. Resource Utilization Issues Overview 5.2.2. I/O Pin Utilization or Placement 5.2.3. Logic Utilization or Placement 5.2.4. Routing
5.2.2. I/O Pin Utilization or Placement x
5.2.2.1. Guideline: Modify Pin Assignments or Choose a Larger Package
5.2.3. Logic Utilization or Placement x
5.2.3.1. Guideline: Optimize Source Code 5.2.3.2. Guideline: Optimize Synthesis for Area, Not Speed 5.2.3.3. Guideline: Restructure Multiplexers 5.2.3.4. Guideline: Perform WYSIWYG Primitive Resynthesis with Balanced or Area Setting 5.2.3.5. Guideline: Use Register Packing 5.2.3.6. Guideline: Remove Fitter Constraints 5.2.3.7. Guideline: Flatten the Hierarchy During Synthesis 5.2.3.8. Guideline: Re-target Memory Blocks 5.2.3.9. Guideline: Use Physical Synthesis Options to Reduce Area 5.2.3.10. Guideline: Retarget or Balance DSP Blocks 5.2.3.11. Guideline: Use a Larger Device 5.2.3.12. Guideline: Reduce Global Signal Congestion 5.2.3.13. Guideline: Report Pipelining Information
5.2.4. Routing x
5.2.4.1. Guideline: Set Auto Packed Registers to Sparse or Sparse Auto 5.2.4.2. Guideline: Set Fitter Aggressive Routability Optimizations to Always 5.2.4.3. Guideline: Increase Router Effort Multiplier 5.2.4.4. Guideline: Remove Fitter Constraints 5.2.4.5. Guideline: Optimize Synthesis for Routability 5.2.4.6. Guideline: Optimize Source Code 5.2.4.7. Guideline: Use a Larger Device
5.3. Scripting Support x
5.3.1. Initial Compilation Settings 5.3.2. Resource Utilization Optimization Techniques
6. Timing Closure and Optimization x
6.1. Optimize Multi Corner Timing 6.2. Optimize Critical Paths 6.3. Optimize Critical Chains 6.4. Design Evaluation for Timing Closure 6.5. Timing Optimization 6.6. Periphery to Core Register Placement and Routing Optimization 6.7. Scripting Support 6.8. Timing Closure and Optimization Revision History
6.2. Optimize Critical Paths x
6.2.1. Viewing Critical Paths
6.3. Optimize Critical Chains x
6.3.1. Viewing Critical Chains
6.4. Design Evaluation for Timing Closure x
6.4.1. Review Messages 6.4.2. Evaluate Fitter Netlist Optimizations 6.4.3. Evaluate Optimization Results 6.4.4. Evaluate Resource Usage 6.4.5. Evaluate Other Reports and Adjust Settings Accordingly 6.4.6. Evaluate Clustering Difficulty 6.4.7. Revise and Recompile
6.4.4. Evaluate Resource Usage x
6.4.4.1. Evaluate Global and Non-Global Usage 6.4.4.2. Evaluate Routing Usage 6.4.4.3. Evaluate Wires Added for Hold
6.5. Timing Optimization x
6.5.1. Correct Design Assistant Rule Violations 6.5.2. Implement Fast Forward Timing Closure Recommendations 6.5.3. Review Timing Path Details 6.5.4. Try Optional Fitter Settings 6.5.5. Back-Annotate Optimized Assignments 6.5.6. Optimize Settings with Design Space Explorer II 6.5.7. Aggregating and Comparing Compilation Results with Exploration Dashboard 6.5.8. I/O Timing Optimization Techniques 6.5.9. Register-to-Register Timing Optimization Techniques 6.5.10. Metastability Analysis and Optimization Techniques
6.5.2. Implement Fast Forward Timing Closure Recommendations x
6.5.2.1. Retiming Limit Details Report 6.5.2.2. Fast Forward Timing Closure Recommendations
6.5.2.1. Retiming Limit Details Report x
6.5.2.1.1. Using the Retiming Limit Details Report
6.5.2.2. Fast Forward Timing Closure Recommendations x
6.5.2.2.1. Generating Fast Forward Timing Closure Recommendations 6.5.2.2.2. Implementing Fast Forward Recommendations
6.5.3. Review Timing Path Details x
6.5.3.1. Report Timing 6.5.3.2. Report Logic Depth 6.5.3.3. Report Neighbor Paths 6.5.3.4. Report Register Spread 6.5.3.5. Report Route Net of Interest 6.5.3.6. Report Retiming Restrictions 6.5.3.7. Report Pipelining Information 6.5.3.8. Report CDC Viewer 6.5.3.9. Timing Closure Recommendations 6.5.3.10. Global Network Buffers 6.5.3.11. Resets and Global Networks 6.5.3.12. Suspicious Setup 6.5.3.13. Auto Shift Register Replacement 6.5.3.14. Clocking Architecture
6.5.3.10. Global Network Buffers x
6.5.3.10.1. Source Location 6.5.3.10.2. Insertion Delay 6.5.3.10.3. Fan-Out 6.5.3.10.4. Global Signal Assignment
6.5.4. Try Optional Fitter Settings x
6.5.4.1. Optimize Hold Timing 6.5.4.2. Fitter Aggressive Routability Optimization
6.5.6. Optimize Settings with Design Space Explorer II x
6.5.6.1. DSE II Computing Resources 6.5.6.2. DSE II Optimization Parameters 6.5.6.3. DSE II Result Management 6.5.6.4. Running DSE II
6.5.7. Aggregating and Comparing Compilation Results with Exploration Dashboard x
6.5.7.1. Aggregation Use Case 6.5.7.2. Comparison Use Case 6.5.7.3. Exploration Dashboard Object-Property Model 6.5.7.4. Starting the Exploration Dashboard
6.5.7.3. Exploration Dashboard Object-Property Model x
6.5.7.3.1. Base Exploration Dashboard Properties 6.5.7.3.2. Project Handle Properties 6.5.7.3.3. Project Group Objects and Properties 6.5.7.3.4. Workspace Objects and Properties
6.5.8. I/O Timing Optimization Techniques x
6.5.8.1. I/O Timing Constraints 6.5.8.2. Optimize IOC Register Placement for Timing Logic Option 6.5.8.3. Fast Input, Output, and Output Enable Registers 6.5.8.4. Programmable Delays 6.5.8.5. Use PLLs to Shift Clock Edges 6.5.8.6. Use Fast Regional Clock Networks and Regional Clocks Networks 6.5.8.7. Spine Clock Limitations
6.5.9. Register-to-Register Timing Optimization Techniques x
6.5.9.1. Optimize Source Code 6.5.9.2. Improving Register-to-Register Timing 6.5.9.3. Physical Synthesis Optimizations 6.5.9.4. Set Power Optimization During Synthesis to Normal Compilation 6.5.9.5. Optimize Synthesis for Performance, Not Area 6.5.9.6. Flatten the Hierarchy During Synthesis 6.5.9.7. Set the Synthesis Effort to High 6.5.9.8. Change Adder Tree Styles 6.5.9.9. Duplicate Registers for Fan-Out Control 6.5.9.10. Prevent Shift Register Inference 6.5.9.11. Use Other Synthesis Options Available in Your Synthesis Tool 6.5.9.12. Fitter Seed 6.5.9.13. Set Maximum Router Timing Optimization Level 6.5.9.14. Register-to-Register Timing Analysis
6.5.9.9. Duplicate Registers for Fan-Out Control x
6.5.9.9.1. Manual Register Duplication 6.5.9.9.2. Automatic Register Duplication: Estimated Physical Proximity 6.5.9.9.3. Automatic Register Duplication: Hierarchical Proximity
6.5.9.14. Register-to-Register Timing Analysis x
6.5.9.14.1. Tips for Analyzing Failing Paths 6.5.9.14.2. Tips for Analyzing Failing Clock Paths that Cross Clock Domains 6.5.9.14.3. Tips for Critical Path Analysis 6.5.9.14.4. Tips for Creating a .tcl Script to Monitor Critical Paths Across Compiles 6.5.9.14.5. Global Routing Resources 6.5.9.14.6. Register RAMS and DSPs
6.6. Periphery to Core Register Placement and Routing Optimization x
6.6.1. Setting Periphery to Core Optimizations in the Advanced Fitter Setting Dialog Box 6.6.2. Setting Periphery to Core Optimizations in the Assignment Editor 6.6.3. Viewing Periphery to Core Optimizations in the Fitter Report
6.7. Scripting Support x
6.7.1. Initial Compilation Settings 6.7.2. I/O Timing Optimization Techniques 6.7.3. Register-to-Register Timing Optimization Techniques
7. Analyzing and Optimizing the Design Floorplan x
7.1. Design Floorplan Analysis in Chip Planner 7.2. Defining Logic Lock Placement Constraints 7.3. Defining Virtual Pins 7.4. Using Logic Lock Regions in Combination with Design Partitions 7.5. Creating Clock Region Assignments in Chip Planner 7.6. Scripting Support 7.7. Analyzing and Optimizing the Design Floorplan Revision History
7.1. Design Floorplan Analysis in Chip Planner x
7.1.1. Starting the Chip Planner 7.1.2. Chip Planner GUI 7.1.3. Viewing Design Elements in Chip Planner 7.1.4. Finding Design Elements in the Chip Planner 7.1.5. Exploring Paths in the Chip Planner 7.1.6. Viewing Assignments in the Chip Planner 7.1.7. Viewing High-Speed and Low-Power Tiles in the Chip Planner 7.1.8. Viewing Design Partition Placement
7.1.3. Viewing Design Elements in Chip Planner x
7.1.3.1. Viewing Architecture-Specific Design Information in Chip Planner 7.1.3.2. Viewing Available Clock Networks in Chip Planner 7.1.3.3. Viewing Clock Sector Utilization in Chip Planner 7.1.3.4. Viewing Routing Congestion in Chip Planner 7.1.3.5. Viewing I/O Banks in Chip Planner 7.1.3.6. Viewing High-Speed Serial Interfaces (HSSI) in Chip Planner 7.1.3.7. Viewing Source and Destination Nodes in Chip Planner 7.1.3.8. Viewing Fan-In and Fan-Out in Chip Planner 7.1.3.9. Viewing Immediate Fan-In and Fan-Out in Chip Planner 7.1.3.10. Viewing the Selected Contents in Chip Planner 7.1.3.11. Viewing the Location and Utilization of Device Resources in Chip Planner 7.1.3.12. Viewing Module Placement by Cross-Probing to Chip Planner
7.1.4. Finding Design Elements in the Chip Planner x
7.1.4.1. Find Options (Chip Planner Search)
7.1.5. Exploring Paths in the Chip Planner x
7.1.5.1. Analyzing Connections for a Path 7.1.5.2. Locate Path from the Timing Analysis Report to the Chip Planner 7.1.5.3. Show Delays 7.1.5.4. Viewing Routing Resources
7.2. Defining Logic Lock Placement Constraints x
7.2.1. The Logic Lock Regions Window 7.2.2. Defining Logic Lock Regions 7.2.3. Customizing the Shape of Logic Lock Regions 7.2.4. Assigning Device Pins to Logic Lock Regions 7.2.5. Viewing Connections Between Logic Lock Regions in Chip Planner 7.2.6. Example: Placement Best Practices for Intel® Arria® 10 FPGAs 7.2.7. Migrating Assignments between Intel® Quartus® Prime Standard Edition and Intel® Quartus® Prime Pro Edition
7.2.2. Defining Logic Lock Regions x
7.2.2.1. Defining a Logic Lock Region in Chip Planner 7.2.2.2. Defining a Logic Lock Region from the Project Navigator 7.2.2.3. Defining Routing Regions 7.2.2.4. Defining Empty Logic Lock Regions 7.2.2.5. Defining Hierarchical Logic Lock Regions
7.2.2.1. Defining a Logic Lock Region in Chip Planner x
7.2.2.1.1. Logic Lock Region Properties 7.2.2.1.2. Snapping to a Region 7.2.2.1.3. Considerations for Auto Sized Regions
7.2.3. Customizing the Shape of Logic Lock Regions x
7.2.3.1. Adding a New Shape to a Logic Lock Region 7.2.3.2. Subtracting Shape from Logic Lock Region 7.2.3.3. Merging Logic Lock Regions 7.2.3.4. Defining Noncontiguous Logic Lock Regions
7.4. Using Logic Lock Regions in Combination with Design Partitions x
7.4.1. Viewing Design Connectivity and Hierarchy
7.5. Creating Clock Region Assignments in Chip Planner x
7.5.1. Creating Clock Assignments in Chip Planner 7.5.2. Resizing a Clock Assignment in Chip Planner 7.5.3. Moving a Clock Assignment in Chip Planner 7.5.4. Deleting a Clock Region Assignment in Chip Planner 7.5.5. Assigning a Clock Signal to a Clock Region in Chip Planner
7.5.1. Creating Clock Assignments in Chip Planner x
7.5.1.1. Clock Assignment Properties
7.6. Scripting Support x
7.6.1. Creating Logic Lock Assignments with Tcl commands 7.6.2. Assigning Virtual Pins with a Tcl command 7.6.3. Logic Lock Region Assignment Examples
8. Using the ECO Compilation Flow x
8.1. ECO Compilation Flow 8.2. ECO Tcl Script Example 8.3. Viewing ECO Compilation Reports 8.4. ECO Commands 8.5. ECO Command Limitations 8.6. Interactive ECO Fitting 8.7. Using the ECO Compilation Flow Revision History
8.4. ECO Commands x
8.4.1. ECO Command Quick Reference 8.4.2. make_connection 8.4.3. remove_connection 8.4.4. modify_lutmask 8.4.5. adjust_pll_refclk 8.4.6. modify_io_slew_rate 8.4.7. modify_io_current_strength 8.4.8. modify_io_delay_chain 8.4.9. create_new_node 8.4.10. remove_node 8.4.11. place_node 8.4.12. unplace_node 8.4.13. create_wirelut
8.6. Interactive ECO Fitting x
8.6.1. eco_load_design and eco_commit_design Commands
1. Answers to Top FAQs
2. Design Optimization Overview
3. Optimizing the Design Netlist
4. Netlist Optimizations and Physical Synthesis
5. Area Optimization
6. Timing Closure and Optimization
7. Analyzing and Optimizing the Design Floorplan
8. Using the ECO Compilation Flow
9. Intel® Quartus® Prime Pro Edition Design Optimization User Guide Archives
A. Intel® Quartus® Prime Pro Edition User Guides

7.7. Analyzing and Optimizing the Design Floorplan Revision History

The following revision history applies to this chapter:

Table 43.  Document Revision History
Document Version Intel® Quartus® Prime Version Changes
2023.04.03 23.1
  • Updated product family name to "Intel Agilex 7."
2022.09.26 22.3
  • Updated chapter for new Compilation Regions tab in the Logic Lock Regions window. This read-only tab displays the properties of any Logic Lock regions contained in a .qdb file in the current project.
2022.01.07 21.4
  • Added Properties tab information to Viewing Architecture-Specific Design Information topic.
  • Added Design Assistant information to Using Logic Lock Regions in the Chip Planner topic.
  • Added new Viewing the Location and Utilization of Device Resources in Chip Planner topic.
  • Added new Viewing Module Placement by Cross-Probing to Chip Planner topic.
  • Added new Finding Design Elements in the Chip Planner topic.
  • Added new Find In Options topic.
2019.07.30 19.3.0 Added new Using User-Defined Clock Regions in the Chip Planner section.
2019.07.01 19.1.0 Added new "Snapping to a Region" topic that describes the Snap Logic Lock Region to option.
2019.04.01 19.1.0
  • Added new "Viewing Selected Contents" topic that describes a new report listing selected design elements.
2018.09.24 18.1.0
  • Added topic: Viewing Clock Sector Utilization
  • Added topic: Viewing the Source and Destination of Placed Nodes.
  • Renamed topic: Generating Fan-In and Fan-Out Connections to Viewing Fan-In and Fan-Out Connections of Placed Resources.
2018.05.07 18.0.0
  • Added recommendations for using iterative methods for floorplanning.
2017.11.06 17.1.0
  • Changed instances of LogicLock Plus to Logic Lock.
  • Added support for auto-sized Logic Lock regions.
  • Added support for empty Logic Lock regions.
  • Added topics: Considerations on Using Auto Sized Regions, Creating Partitions and Logic Lock Regions with the Design Partition Planner and Chip Planner.
2017.05.08 17.0.0
  • Chapter reorganization and content update.
  • Added figures: Clock Regions, Path List in the Locate History Window, Show Physical Routing, Using the Add Rectangle Feature, Using the Subtract Rectangle Feature, Creating a Hole in a LogicLock Region, Noncontiguous LogicLock Region, Routing Regions, Logic Placed Outside of an Empty Region.
  • Updated figures: HSSI Channel Blocks, Highlight Routing, High-Speed and Low Power Tiles in an Arria 10 Device, Show Delays Highlight Routing, Viewing Assignments in the Chip Planner, LogicLock Plus Regions Window, Using the Merge LogicLock Plus Region Command.
  • Created topics: Adding Rectangle to a LogicLock Plus Region, Subtracting Rectangle from a LogicLock Plus Region.
  • Moved topic: Viewing Critical Paths to Timing Closure and Optimization chapter and renamed to Critical Paths.
  • Renamed topic: Creating Non-Rectangular LogicLock Plus Regions to Merging LogicLock Plus Regions.
  • Renamed topic: Chip Planner Overview to Design Floorplan Analysis in the Chip Planner.
  • Renamed chapter from Analyzing and Optimizing the Design Floorplan with the Chip Planner to Analyzing and Optimizing the Design Floorplan.
2016.10.31 16.1.0
  • Implemented Intel rebranding.
  • Added topic describing how to create a hole in a LogicLock Plus region.
2016.05.02 16.0.0 Updated information on creating LogicLock Plus regions.
2015.11.02 15.1.0
  • Changed instances of Quartus II to Quartus Prime.
  • Added information on how to use LogicLock regions.
2015.05.04 15.0.0 Added information about color coding of LogicLock regions.
2014.12.15 14.1.0 Updated description of Virtual Pins assignment to clarify that assigned input is not available.
June 2014 14.0.0 Updated format
November 2013 13.1.0 Removed HardCopy device information.
May 2013 13.0.0 Updated “Viewing Routing Congestion” section

Updated references to Quartus UI controls for the Chip Planner

June 2012 12.0.0 Removed survey link.
November 2011 11.0.1 Template update.
May 2011 11.0.0
  • Updated for the 11.0 release.

    Edited “LogicLock Regions”

    Updated “Viewing Routing Congestion”

    Updated “Locate History”

    Updated Figures 15-4, 15-9, 15-10, and 15-13

    Added Figure 15-6
December 2010 10.1.0
  • Updated for the 10.1 release.
July 2010 10.0.0
  • Updated device support information
  • Removed references to Timing Closure Floorplan; removed “Design Analysis Using the Timing Closure Floorplan” section
  • Added links to online Help topics
  • Added “Using LogicLock Regions with the Design Partition Planner” section
  • Updated “Viewing Critical Paths” section
  • Updated several graphics
  • Updated format of Document revision History table
November 2009 9.1.0
  • Updated supported device information throughout
  • Removed deprecated sections related to the Timing Closure Floorplan for older device families. (For information on using the Timing Closure Floorplan with older device families, refer to previous versions of the Quartus Prime Handbook, available in the Documentation Archive.)
  • Updated “Creating Nonrectangular LogicLock Regions” section
  • Added “Selected Elements Window” section
  • Updated table 12-1
May 2008 8.0.0
  • Updated the following sections:

    “Chip Planner Tasks and Layers”

    “LogicLock Regions”

    “Back-Annotating LogicLock Regions”

    “LogicLock Regions in the Timing Closure Floorplan”

  • Added the following sections:

    “Reserve LogicLock Region”

    “Creating Nonrectangular LogicLock Regions”

    “Viewing Available Clock Networks in the Device”

  • Updated Table 10–1
  • Removed the following sections:

    Reserve LogicLock Region Design Analysis Using the Timing Closure Floorplan

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