How to modify External Memory timing setup for DDR2 at 240MHz

  // External Memory Timing Setup
  if (status == E_PASS)
  {
    #if defined(AM1810)
      // Timings for DDR2 at 150 MHz
      status |= DEVICE_ExternalMemInit(0x00000047, 0x08934832, 0x204929C9, 0x0C12C722, 0x00000406, 0x00000000);
    #elif defined(OMAPL138_LCDK)
      // Timings for DDR2 at 150 MHz
      status |= DEVICE_ExternalMemInit(0x000000C5, 0x00134832, 0x264A3209, 0x3C14C722, 0x00000492, 0x00000000);
    #elif defined(C6748_LCDK)
      // Timings for DDR2 at 150 MHz
      status |= DEVICE_ExternalMemInit(0x000000C5, 0x00134832, 0x264A3209, 0x3C14C722, 0x00000492, 0x00000000);
    #else
      // Timings for mDDR at 150 MHz
      status |= DEVICE_ExternalMemInit(0x000000C4, 0x0A034622, 0x1C912A08, 0x3811C700, 0x00000494, 0x00000000);
    #endif
  }
#endif