UltraScale architecture Memory IP defines a memory controller using a pre-engineered controller and PHY for interfacing user designs and AMBA specification AXI4 slave interfaces to DDR3, DDR4, QDRII+, QRDRIV, and RLDRAM3 SRAM devices.
The Memory IP is structured so that only the physical layer (PHY) interconnect in the
AMD device needs to be updated when pinouts change. Because
the PHY implementation depends on the I/O assignments, it must occur
after the I/Os are placed and validated. To enable memory I/O
planning after synthesis, the implementation of the PHY now happens as a part of
implementation during the opt_design command.