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Regression Testing in UVM

Eliz

I would like to know if it is possible to run different test cases in regression mode in a single simulation in NCSIM. My test bench consists of Xilinx MIG which needs to be calibrated (takes time) before simulation. Right know this initialization needs to be repeated for each and every test case(while running regression) which is time consuming.
I would like to know if test case 2 can start after test 1 ends (from that instant) rather than beginning from time 0 so that the calibration needs to be done only once at the start of regression test ?

  • Hi Elizabeth.

    NCSim has a save & restore feature that you might find helpful here. You could use it to run the calibration phase, then stop the simulation via a breakpoint if you have a handy signal to trigger off, or just run for a certain period of time. Once you've reached the end of calibration, you'd issue the Tcl "save" command to save the simulation state, e.g. "save calibrated". Now you can carry on the simulation for your first test. When you want to run the 2nd test you would start NCSim again but instead of loading the original compiled design snapshot, you'd tell it to load the saved snapshot: "ncsim calibrated". The simulation would then resume from the saved state, saving you the calibration time. This even works so that you can run multiple simulations from the saved state, in parallel, you're not constrained to run your tests sequentially.

    What you do to select your testcase will depend on your test methodology. For example if you use compiled asm or C code in a hex file, you'd need to load the new hex file for the test you're going to run. This could be done from Tcl.

    If you use UVM, then we have an App Note on how to manage the UVM tests to select different tests when you restore a saved state (it also allows you to restore and re-seed). See the link below for that App Note.
  • Thank you Steve. Its in UVM. Let me try out.

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