You can change the AMD Vivado™ IP catalog parameters and continue to use the PIO design to create customized Verilog source to match the selected BAR settings. However, because the PIO design parameters are more limited than the core parameters, consider the following example design limitations when changing the default IP catalog parameters:
- The example design supports one I/O space BAR, one 32-bit Memory space (that cannot be the Expansion ROM space), and one 64-bit Memory space. If these limits are exceeded, only the first space of a given type is active—accesses to the other spaces do not result in completions.
- Each space is implemented with a 2 KB memory. If the corresponding BAR is configured to a wider aperture, accesses beyond the 2 KB limit wrap around and overlap the 2 KB memory space.
- The PIO design supports one I/O space BAR, which by default is disabled, but can be changed if desired.
Although there are limitations to the PIO design, Verilog source code is provided so you can tailor the example design to your specific needs.