sdram params

   wb_sdram_ctrl
     #(
       .TECHNOLOGY          ("ALTERA"),
       .CLK_FREQ_MHZ            (25), //(100),  // sdram_clk freq in MHZ
       .POWERUP_DELAY           (200),  // power up delay in us
       .WB_PORTS            (3),    // Number of wishbone ports
       .ROW_WIDTH           (13),   // Row width
       .COL_WIDTH           (9),    // Column width
       .BA_WIDTH            (2),    // Ba width
       .tCAC                (2),    // CAS Latency
       .tRAC                (5),    // RAS Latency
       .tRP             (2),    // Command Period (PRE to ACT)
       .tRC             (7),    // Command Period (REF to REF / ACT to ACT)
       .tMRD                (2) // Mode Register Set To Command Delay time
      )