FPGA "user application example " to scan full 4GB DDR4 Memory on Device - Arria10

The example design includes the Traffic Generator (or in recent versions of the memory IP, Traffic Generator 2.0) that can be used for this purpose. See the EMIF IP user guide for details on its use. See the documentation here:

https://www.intel.com/content/www/us/en/programmable/support/support-resources/support-centers/external-memory-interfaces-support.html