How to set sdram refresh control register initial value ?

Hi all,

I have a target board with vr4131 processor and K4S561632C-75c samsung sdram, vr4131 has inbuilt sdram controller. Now i have to set the sdram control unit's refresh control register. for that formula what they have given is

Refresh interval = BRF(13:0) × VTClock

Calculate the setting value based on the DRAM refresh cycle count and bus access cycle (each address space/bus hold cycle) that are used. Refer to the CLKSPEEDREG register for the frequency of VTClock.

VTClock =33.2Mhz Refresh cycle count= 64ms/8k (from sdram data sheet) i have to calculate BRF value (14 bits).
if any one have some idea.please help me

Thanks in advance

Regards,
Lucky