Solution ID: rd03142007_155
Last Modified: Mar 28, 2007
Product Category: Design Software
Product Area: Simulation/Formal Verification
Product Sub-area: 3rd Party Simulation Tool

Problem

Why does Modelsim stop responding at "# ** Note: (vsim-3812) Design is being optimized..."?

Solution

This problem may occur if you are using ModelSim® version 6.2 (for example, 6.2a, 6.2b or 6.2<x>) while running the vsim command. ModelSim version 6.2 does not work correctly with Quartus® II simulation models. This is due to a problem in the ModelSim software version 6.2 and it is scheduled to be fixed in version 6.3.

Due to this problem, the Quartus II software does not officially support ModelSim version 6.2. For more information about the supported EDA tools for any particular version of the Quartus II software, refer to the Release Notes on the Quartus II Literature page.

To work around this issue, turn off the optimization flow by specifying the -novopt argument in the vsim command.

For example, you may use the following vsim command:

vsim -t ps work.test_tst

Modify the command by adding the -novopt argument as follows:

vsim -novopt -t ps work.test_tst

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Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.