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1.1. Simulator Support
1.2. Simulation Levels
1.3. HDL Support
1.4. Simulation Flows
1.5. Preparing for Simulation
1.6. Simulating Intel® FPGA IP Cores
1.7. Using NativeLink Simulation ( Intel® Quartus® Prime Standard Edition)
1.8. Running a Simulation (Custom Flow)
1.9. Simulating Intel FPGA Designs Revision History
2.2.1. Using Questa* Intel® FPGA Edition Precompiled Libraries
2.2.2. Disabling Timing Violation on Registers
2.2.3. Passing Parameter Information from Verilog HDL to VHDL
2.2.4. Increasing Simulation Speed in ModelSim and Questa Simulators
2.2.53.2.15.2.2. Simulating Transport Delays2.2.53.2.15.2.2. Simulating Transport Delays2.2.53.2.15.2.2. Simulating Transport Delays
2.2.6. Viewing Simulation Messages
2.2.7. Generating Power Analysis Files
2.2.8. Viewing Simulation Waveforms
2.2.9. Simulating with Questa* Intel® FPGA Edition Waveform Editor
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2.2.2. Disabling Timing Violation on Registers
In certain situations, you may want to ignore timing violations on registers and disable the “X” propagation that occurs. For example, this technique may be helpful to eliminate timing violations in internal synchronization registers in asynchronous clock-domain crossing. Intel® Arria® 10 devices do not support timing simulation. Intel® Arria® 10 devices do not support timing simulation.
By default, the x_on_violation_option logic option is enabled for all design registers, resulting in an output of “X” at timing violation. To disable “X” propagation at timing violations on a specific register, disable the x_on_violation_option logic option for the specific register, as shown in the following example from the Intel® Quartus® Prime Settings File (.qsf).
set_instance_assignment -name X_ON_VIOLATION_OPTION OFF -to \ <register_name>