Boundary Scan Test Fault Insertion
Use this function to:
- Check the fault coverage of your test for a specific fault condition.
- Insert an open fault without modifying your board or test fixture.
- Validate that your test is working as expected.
How to Insert Faults
1. Create a file FaultInsert.txt in your test project directory.
2. Add fault declarations to the FaultInsert.txt file as shown below. A sample file with syntax examples can be found in the /onTAP program directory.
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open u6.15;
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// pin will be open to all signals
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open u9.12,u12.8;
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// multiple pins will fail to capture other pins’ signals
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stucklow u6.18;
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// pin and net are stuck low
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stucklow u20.a5;
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// all pins on net ADDR14 will be measured low
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short u3.8 u2.10;
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// shorts nets of pins in list, low values prevail.
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drivelow u17.6;
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// always drive pin to a low value
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drivehigh u13.18;
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// always drive pin to a high value
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drivez u7.a2;
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// always drive pin to a high impedance
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measurelow u20.9;
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measurehigh u67.3;
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3. Run the project’s SVF file from the onTAP Test Screen.
When onTAP detects a FaultInsert.txt file in your project folder, it posts a message so that when you run the the test, diagnostic messages corresponding to the inserted fault expressions are displayed.
