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

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ID 683641
Date 8/01/2023
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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
5.1.2. Fitter Reports x
5.1.2.1. Route Stage Reports
5.1.2.1. Route Stage Reports x
5.1.2.1.1. Nets with Highest Wire Count Report 5.1.2.1.2. Delay Chain Summary Report 5.1.2.1.3. Top Congested Hierarchies and Nets Reports 5.1.2.1.4. Global Route Reports
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

6.5.9.14.3. Tips for Critical Path Analysis

When analyzing the failing paths in a design, it is helpful to understand the interactions around the critical paths.

To understand what may be pulling on a critical path, the following report_timing command can be useful.

  1. In the project directory, run the report_timing command to find the nodes in a critical path.
  2. Copy the code below in a .tcl file, and replace the first two variable with the node names from the From Node and To Node columns of the worst path. The script analyzes the path between the worst source and destination registers. 
    set wrst_src <insert_source_of_worst_path_here>
set wrst_dst <insert_destination_of_worst_path_here>
report_timing -setup -npaths 50 -detail path_only -from $wrst_src \
-panel_name "Worst Path||wrst_src -> *"
report_timing -setup -npaths 50 -detail path_only -to $wrst_dst \
-panel_name "Worst Path||* -> wrst_dst"
report_timing -setup -npaths 50 -detail path_only -to $wrst_src \
-panel_name "Worst Path||* -> wrst_src"
report_timing -setup -npaths 50 -detail path_only -from $wrst_dst \
-panel_name "Worst Path||wrst_dst -> *"
  3. From the Script menu, source the .tcl file.
  4. In the resulting timing panel, locate timing failed paths (highlighted in red) in the Chip Planner, and view information such as distance between the nodes and large fan-outs.

    The figure shows a simplified example of what these reports analyzed.

    Figure 71. Timing Report

    The critical path of the design is in red. The relation between the .tcl script and the figure is:

    • The first two lines show everything inside the two endpoints of the critical path that are pulling them in different directions.
      • The first report_timing command analyzes all paths the source is driving, shown in green.
      • The second report_timing command analyzes all paths going to the destination, including the critical path, shown in orange.
    • The last two report_timing commands show everything outside of the endpoints pulling them in other directions.
If any of these neighboring paths have slacks near the critical path, the Fitter is balancing these paths with the critical path, trying to achieve the best slack.
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