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Answers to Top FAQs
1. Signal Integrity Analysis with Third-Party Tools
2. Reviewing Printed Circuit Board Schematics with the Quartus® Prime Software
3. Siemens EDA PCB Design Tools Support
4. Cadence Board Design Tools Support
5. Quartus® Prime Pro Edition User Guide: PCB Design Tools Document Archives
A. Quartus® Prime Pro Edition User Guides
1.4.1. IBIS Model Access and Customization Flows
1.4.2. Elements of an IBIS Model
1.4.3. Customizing IBIS Models
1.4.4. Design Simulation Using the Siemens EDA HyperLynx* Software
1.4.5. Configuring LineSim to Use Intel IBIS Models
1.4.6. Integrating Intel IBIS Models into LineSim Simulations
1.4.7. Running and Interpreting LineSim Simulations
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
1.5.12.1. 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
2.1. Reviewing 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 Quartus® Prime Software Features
2.5. Using Additional Quartus® Prime Software Tools
2.6. Reviewing Printed Circuit Board Schematics with the Quartus® Prime Software Revision History
4.1. Cadence PCB Design Tools Support
4.2. Product Comparison
4.3. FPGA-to-PCB Design Flow
4.4. Setting Up the 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
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1.5.3.2. The Solution to Double Counting
To adjust the measurements to account for the double-counting, the delay between the arbitrary point in the output buffer selected by the HSPICE model and the FPGA pin must be subtracted from either tCO or tPD before adding the results together. The subtracted delay must also be based on a common load between the two measurements. This is done by repeating the HSPICE model measurement, but with the same load used by the Quartus® Prime software for the tCO measurement.
Figure 12. Common Test Loads Used for Output Timing
With tTESTLOAD known, the total delay is calculated for the output signal from the FPGA logic to the signal destination on the board, accounting for the double count.
tdelay = tCO+(tPD-tTESTLOAD)
The preconfigured simulation files generated by the HSPICE Writer in the Quartus® Prime software are designed to account for the double-counting problem based on this calculation automatically.