Intel® Quartus® Prime Pro Edition User Guide: PCB Design Tools

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ID 683768
Date 11/04/2020
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Document Table of Contents
Document Table of Contents x
1. Signal Integrity Analysis with Third-Party Tools 2. Reviewing Printed Circuit Board Schematics with the Intel® Quartus® Prime Software 3. Mentor Graphics* PCB Design Tools Support 4. Cadence Board Design Tools Support 5. Intel Quartus Prime Pro Edition User Guide: PCB Design Tools Document Archives A. Intel® Quartus® Prime Pro Edition User Guides
1. Signal Integrity Analysis with Third-Party Tools x
1.1. Signal Integrity Analysis with Third-Party Tools 1.2. I/O Model Selection: IBIS or HSPICE 1.3. FPGA to Board Signal Integrity Analysis Flow 1.4. Simulation with IBIS Models 1.5. Simulation with HSPICE Models 1.6. Signal Integrity Analysis with Third-Party Tools Document Revision History
1.1. Signal Integrity Analysis with Third-Party Tools x
1.1.1. Signal Integrity Simulations with HSPICE and IBIS Models
1.3. FPGA to Board Signal Integrity Analysis Flow x
1.3.1. Create I/O and Board Trace Model Assignments 1.3.2. Output File Generation 1.3.3. Customize the Output Files 1.3.4. Set Up and Run Simulations in Third-Party Tools 1.3.5. Interpret Simulation Results
1.4. Simulation with IBIS Models x
1.4.1. Elements of an IBIS Model 1.4.2. Creating Accurate IBIS Models 1.4.3. Design Simulation Using the Mentor Graphics* HyperLynx* Software 1.4.4. Configuring LineSim to Use Intel IBIS Models 1.4.5. Integrating Intel IBIS Models into LineSim Simulations 1.4.6. Running and Interpreting LineSim Simulations
1.4.2. Creating Accurate IBIS Models x
1.4.2.1. Download IBIS Models 1.4.2.2. Generate Custom IBIS Models with the IBIS Writer
1.5. Simulation with HSPICE Models x
1.5.1. Supported Devices and Signaling 1.5.2. Accessing HSPICE Simulation Kits 1.5.3. The Double Counting Problem in HSPICE Simulations 1.5.4. HSPICE Writer Tool Flow 1.5.5. Running an HSPICE Simulation 1.5.6. Interpreting the Results of an Output Simulation 1.5.7. Interpreting the Results of an Input Simulation 1.5.8. Viewing and Interpreting Tabular Simulation Results 1.5.9. Viewing Graphical Simulation Results 1.5.10. Making Design Adjustments Based on HSPICE Simulations 1.5.11. Sample Input for I/O HSPICE Simulation Deck 1.5.12. Sample Output for I/O HSPICE Simulation Deck 1.5.13. Advanced Topics
1.5.3. The Double Counting Problem in HSPICE Simulations x
1.5.3.1. Defining the Double Counting Problem 1.5.3.2. The Solution to Double Counting
1.5.4. HSPICE Writer Tool Flow x
1.5.4.1. Applying I/O Assignments 1.5.4.2. Enabling HSPICE Writer 1.5.4.3. Enabling HSPICE Writer Using Assignments 1.5.4.4. Naming Conventions for HSPICE Files 1.5.4.5. Invoking HSPICE Writer 1.5.4.6. Invoking HSPICE Writer from the Command Line 1.5.4.7. Customizing Automatically Generated HSPICE Decks
1.5.11. Sample Input for I/O HSPICE Simulation Deck x
1.5.11.1. Header Comment 1.5.11.2. Simulation Conditions 1.5.11.3. Simulation Options 1.5.11.4. Constant Definition 1.5.11.5. Buffer Netlist 1.5.11.6. Drive Strength 1.5.11.7. I/O Buffer Instantiation 1.5.11.8. Board Trace and Termination 1.5.11.9. Stimulus Model 1.5.11.10. Simulation Analysis
1.5.12. Sample Output for I/O HSPICE Simulation Deck x
1.5.12.1. Header Comment 1.5.12.2. Simulation Conditions 1.5.12.3. Simulation Options 1.5.12.4. Constant Definition 1.5.12.5. I/O Buffer Netlist 1.5.12.6. Drive Strength 1.5.12.7. Slew Rate and Delay Chain 1.5.12.8. I/O Buffer Instantiation 1.5.12.9. Board and Trace Termination 1.5.12.10. Double-Counting Compensation Circuitry 1.5.12.11. Simulation Analysis
1.5.13. Advanced Topics x
1.5.13.1. PVT Simulations 1.5.13.2. Hold Time Analysis 1.5.13.3. I/O Voltage Variations 1.5.13.4. Correlation Report
2. Reviewing Printed Circuit Board Schematics with the Intel® Quartus® Prime Software x
2.1. Reviewing Intel® Quartus® Prime Software Settings 2.2. Reviewing Device Pin-Out Information in the Fitter Report 2.3. Reviewing Compilation Error and Warning Messages 2.4. Using Additional Intel® Quartus® Prime Software Features 2.5. Using Additional Intel® Quartus® Prime Software Tools 2.6. Reviewing Printed Circuit Board Schematics with the Intel® Quartus® Prime Software Revision History
2.1. Reviewing Intel® Quartus® Prime Software Settings x
2.1.1. Device and Pins Options Dialog Box Settings
2.1.1. Device and Pins Options Dialog Box Settings x
2.1.1.1. Configuration Settings 2.1.1.2. Unused Pin Settings 2.1.1.3. Dual-Purpose Pins Settings 2.1.1.4. Voltage Settings 2.1.1.5. Error Detection CRC Settings
2.5. Using Additional Intel® Quartus® Prime Software Tools x
2.5.1. Pin Planner
3. Mentor Graphics* PCB Design Tools Support x
3.1. Integrating with DxDesigner 3.2. Mentor Graphics* PCB Design Tools Support Revision History
3.1. Integrating with DxDesigner x
3.1.1. DxDesigner Project Settings 3.1.2. Creating Schematic Symbols in DxDesigner
4. Cadence Board Design Tools Support x
4.1. Cadence PCB Design Tools Support 4.2. Product Comparison 4.3. FPGA-to-PCB Design Flow 4.4. Setting Up the Intel® Quartus® Prime Software 4.5. FPGA-to-Board Integration with the Cadence Allegro Design Entry HDL Software 4.6. FPGA-to-Board Integration with Cadence Allegro Design Entry CIS Software 4.7. Cadence Board Design Tools Support Revision History
4.3. FPGA-to-PCB Design Flow x
4.3.1. Integrating Intel FPGA Designs
4.4. Setting Up the Intel® Quartus® Prime Software x
4.4.1. Generating a .pin File
4.5. FPGA-to-Board Integration with the Cadence Allegro Design Entry HDL Software x
4.5.1. Creating Symbols 4.5.2. Instantiating the Symbol in the Cadence Allegro Design Entry HDL Software
4.5.1. Creating Symbols x
4.5.1.1. Cadence Allegro PCB Librarian Part Developer Tool
4.5.1.1. Cadence Allegro PCB Librarian Part Developer Tool x
4.5.1.1.1. Cadence Allegro PCB Librarian Part Developer Tool in the Design Flow 4.5.1.1.2. Import and Export Wizard 4.5.1.1.3. Editing and Fracturing Symbol 4.5.1.1.4. Updating FPGA Symbols
4.6. FPGA-to-Board Integration with Cadence Allegro Design Entry CIS Software x
4.6.1. Creating a Cadence Allegro Design Entry CIS Project 4.6.2. Generating a Part 4.6.3. Generating Schematic Symbol 4.6.4. Splitting a Part 4.6.5. Instantiating a Symbol in a Design Entry CIS Schematic 4.6.6. Intel Libraries for the Cadence Allegro Design Entry CIS Software
4.6.6. Intel Libraries for the Cadence Allegro Design Entry CIS Software x
4.6.6.1. Using the Intel-provided Libraries with your Cadence Allegro Design Entry CIS Project
1. Signal Integrity Analysis with Third-Party Tools
2. Reviewing Printed Circuit Board Schematics with the Intel® Quartus® Prime Software
3. Mentor Graphics* PCB Design Tools Support
4. Cadence Board Design Tools Support
5. Intel Quartus Prime Pro Edition User Guide: PCB Design Tools Document Archives
A. Intel® Quartus® Prime Pro Edition User Guides

1.5.3.1. Defining the Double Counting Problem

The double counting problem is inherent to the difference between the method to analyze output timing in the Intel® Quartus® Prime software versus the method HSPICE models use. The timing analyzer tools in the Intel® Quartus® Prime software measure delay timing for an output signal from the core logic of the FPGA design through the output buffer, ending at the FPGA pin with a default capacitive load or a specified value for the I/O standard you selected. This measurement is the tCO timing variable.
Figure 10. Double Counting Problem

HSPICE models for board simulation measure tPD (propagation delay) from an arbitrary reference point in the output buffer, through the device pin, out along the board routing, and ending at the signal destination.

If you add these two delays, the delay between the output buffer and the device pin appears twice in the calculation. A model or simulation that does not account for this double count creates overly pessimistic simulation results, because the double-counted delay can limit I/O performance artificially.
One approach to fix the problem is subtracting the overlap between tCO and tPD to account for the double count. However, this adjustment is not accurate, because each measurement considers a different load.
Note: Input signals do not exhibit this problem, because the HSPICE models for inputs stop at the FPGA pin instead of at the input buffer. In this case, adding the delays together produces an accurate measurement of delay timing.
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