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    // Timing parameters based on Speed Grade

                                          // SYMBOL UNITS DESCRIPTION
                                          // ------ ----- -----------
       parameter tCK              =     5.0; // tCK    ns    Nominal Clock Cycle Time
    parameter tDQSQ            =     0.4; // tDQSS  ns    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter tMRD             =    10.0; // tMRD   ns    Load Mode Register command cycle time
    parameter tRAP             =    15.0; // tRAP   ns    ACTIVE to READ with Auto precharge command
    parameter tRAS             =    40.0; // tRAS   ns    Active to Precharge command time
    parameter tRC              =    55.0; // tRC    ns    Active to Active/Auto Refresh command time
    parameter tRFC             =    70.0; // tRFC   ns    Refresh to Refresh Command interval time
    parameter tRCD             =    15.0; // tRCD   ns    Active to Read/Write command time
    parameter tRP              =    15.0; // tRP    ns    Precharge command period
    parameter tRRD             =    10.0; // tRRD   ns    Active bank a to Active bank b command time
    parameter tWR              =    15.0; // tWR    ns    Write recovery time

     parameter ADDR_BITS        =      13; // Set this parameter to control how many Address bits are used
    parameter DQ_BITS          =      16; // Set this parameter to control how many Data bits are used
    parameter DQS_BITS         =       2; // Set this parameter to control how many DQS bits are used
    parameter DM_BITS          =       2; // Set this parameter to control how many DM bits are used
    parameter COL_BITS         =       9; // Set this parameter to control how many Column bits are used



    parameter full_mem_bits    = 2 + 13 + 9 ; // Set this parameter to control how many unique addresses are used
    parameter part_mem_bits    = 10;                   // Set this parameter to control how many unique addresses are used

    parameter no_halt          =       1; // If set to 1, the model won't halt on command sequence/major errors
    parameter Debug            =       1; // Turn on debug message