How to calculate value for SDRAM0_RTR?

Could anyone tell me, for a 100MHz sdram, to get 15.2us interval, how to set the SDRAM0_RTR?

The value should be 15.2us / 10us = 1520 = 0x5f0. But why the suggested setting on my hardware spec is 0x0FD00000?

Thanks, Frank

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