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ModelSim-Altera fails to run the simulation with the following error:

<Error message>
Illegal Grid delta. Grid delta must be greater than 1.


Category: Simulation
Tools: ModelSim®-Altera®
device:-


In ModelSim-Altera Edition (including ModelSim-Altera Starter Edition), this error occurs when the grid lines displayed in the Wave window are set incorrectly.
Please change the following settings.

  1. In the main ModelSim-Altera window, select Tools menu ⇒ Edit Preferences..
  2. In the Preferences dialog, select the By Name tab.
  3. Check the value of Wave ⇒ gridDelta and change it to an appropriate positive number. (The default value is 40.)

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