26 May '12, 1pm

MIG DDR2/DDR3 simulation memory overflow error. Must increase the MEM_BITS parameter or define MAX_MEM

Why do I get the following error while simulating my MIG design? ERROR: Memory overflow. Write to Address 000400 with Data xxxxxxxx1f1b1713 will be lost. # You must increase the MEM_BITS parameter or define MAX_MEM. Solution This error is due to limitation in the Micron memory model which sets MEM_BITS equal to 10 by default. You will find MAX_MEM mentioned in the model, but you will need to set it ito a proper value n the *.vh file located in the ./sim directory, or you can set this via command line using one of the following examples: simulator command line --------- ------------ ModelSim vsim -MEM_BITS=8 <memory_model> NC-Verilog ncverilog +defparam+ <memory_model> .MEM_BITS=8 ddr2.v VCS vcs -pvalue+MEM_BITS=8 <memory_model> .v

Full article: http://www.xilinx.com/support/answers/47880.htm

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