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  1. Should PIO bus be 32b ? Since it is an internal bus. In general for interfaces we would like to parameterize the address and bus width. How to do that ? Demo: Why bother?

  2. If we make the pio agent passive, then we should instantiate the predictor ? Missing currently.

  3. Timing diagram for the pio bus.: PNG file.

  4. Initialize call in sequence. How to differ from member variables ? Sometmes it is not obvious which are input parameters and which are internal state ? Use local for internal state. Global for external. But within external some are input and some are output ? No way except by comment.