How to calculate value for SDRAM0_RTR?

From: Frank (young726_at_yahoo.com)
Date: 07/09/04 

Date: 8 Jul 2004 23:54:15 -0700

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