DDR3 critical error

I got the same Critical Warnings with a DDR2 design. This is what I did to eliminate them.

Open the alt_mem_ddrx_controller_st_top.v file. I expect that you will find this line:

parameter CFG_USE_SHADOW_REGS = 0;

If you see this line, my guess is that the outputs in question (afi_rrank and afi_wrank) are not being used. In my case, these outputs were not even included by the instantiating module, ddr2_core_alt_mem_ddrx_controller_top.v.

To make the widths match, find these lines:

parameter CFG_RRANK_BUS_WIDTH = 0;

parameter CFG_WRANK_BUS_WIDTH = 0;

and change them to:

parameter CFG_RRANK_BUS_WIDTH = MEM_IF_CHIP * (DWIDTH_RATIO/2) * MEM_IF_DQS_WIDTH;

parameter CFG_WRANK_BUS_WIDTH = MEM_IF_CHIP * (DWIDTH_RATIO/2) * MEM_IF_DQS_WIDTH;

Save and compile.