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Model Technology Inc.


Capturing port driver data

Some ASIC vendor's toolkits read a VCD file format that provides details on port drivers. This information can be used, for example, to drive a tester. See the ASIC vendor's documentation for toolkit specific information.

In ModelSim use the vcd dumpports command to create a VCD file that captures port driver data.

Port driver direction information is captured as TSSI states in the VCD file. Each time an external or internal port driver changes values, a new value change is recorded in the VCD file with the following format:

p<TSSI state> <0 strength> <1 strength> <identifier_code>


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ModelSim Documentation Bookcase