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-access option in irun

mhkvy4

I was hoping some one would help understand the function of the access option used with irun. The irun guide said that the option is passed to the elaborator to provide read, write or connectivity (+rwc) access to simulation compiled objects. What exactly is meant by this? 

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  • By default the elaborator applies many optimisations to the design, including flattening nets. This means that by default, you might not have visibility of all the signals in the design if you want to Read them (probe waveforms, get teh values via VPI,PLI or Tcl), you may not be able to Write them (deposit or force values from Tcl or PLI or VPI). Connectivity tracing for debug (driver and load tracing) is the last category int he RWC list. Each option (R, RW, RWC) turns off successively more optimisations, making the simulation potentially run slower and use more memory.

  • in reply to StephenH

    Thanks Stephen, I had found something online which said the same, that it helps to probe, read waveforms etc. 

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