Component specific arguments:
rows - Number of rows. columns - Number of columns. ranks - Number of ranks (logical banks). module_data_width - The module SDRAM width (including ECC width if enabled). primary_width - Primary SDRAM width. ecc_width - The error correction width. banks - Number of banks. rank_density - The rank density. memory_megs - Total about of memory in MB. module_type - Type of memory. cas_latency - CAS-latency; each set bit corresponds to a latency the memory can handle