Here can be found a collection of wiki pages, each providing examples how to modify and customize the HDL reference designs.
[Wiki] Creating a new IP
[Wiki] Add a new IP
[Wiki] Use ADI IPs into your own project
[Wiki] A simple BBP for RF Transceivers
Model based design for SDR
[Wiki] Integrate FIR filters into the FMCOMMS2 HDL design
[Wiki] Quick system validation with no-OS