VGS Advanced Topis

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This section provides some information about more advanced features of VGS that are sometimes need for model analysis, test vector generation, and failure analysis.


Vector Generation Options

The default vector generation options work in most cases. This section provides a few guidelines for some special situations.

Options Selection

Test vector generation options by default apply to the entire project (all subsystem). The default options can be changed by selecting the properties menu and Vector Generation Tab. Changes can also be applied to an individual subsystem. If there are issues, this is recommended. However, to apply properties to an individual subsystem, the Build Options much be set to Subsystem Level Options.

Extended MCDC Coverage

There is a vector generation option called for Extended MCDC (as opposed to the default of -MCDC which means DO-178B definition of MCDC which we have always suppored) because that is what the concept of coverage of both > and == for each >= operator falls under.

These options are also available from the command line.

Failure Analysis