qsys - beginner question

The design in that tutorial is for a single 32-bit register. As such, turning it into a custom component does not require an address input. When the component is added to a Platform Designer system, you would just set the base address for this single addressable location. You only need an address input if a master can access more than one location in the slave, in which case you'd add address decoding logic (mux, demux) for accessing the register map with the address signal as the select line.

You can learn more about creating custom components with these online trainings:

https://www.intel.com/content/www/us/en/programmable/support/training/course/oqsys3000.html

https://www.intel.com/content/www/us/en/programmable/support/training/course/oipr1000.html

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