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PLL configuration problem

Hi,

I am using the PLL configuration function of 6424EVM to configure our boards 6424DSP.

For example in EVM PLL multiplier of 30 dont cause any problem which means 30*27 = 810MHz for 600 MHz DSP.

But at our board when I configure the PLL multiplier to 18 (function argument is given 17) emulator disconnects. (18*27=486 for 500MHz DSP)

It works for a multiplier of 17 but there is a big speed problem that I couldnt understand.

Timers work at half of their values, accesses to internal and external memories are very slow etc. I measured the MXI/CLKIN and its value if 27MHz.

I dont know how to solve this problem but maybe you have an idea what should be the problem. Any help is appreciated.

thnx.