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FPGA Memory test fails

Hi,

i am using the c6452 dsp with 720MHz. i have a strange problem when i cool the dsp with cooling solution.

my fpga is connected via the EMIF-A interface. FPGA has attached memory(DDR3). i am using the external clock for the EMIF-A which is 44MHz.

when i use the external clock and when the dsp is hot , the memory test passes.when the dsp is cooled automatically the test fails. then i done a small test instead of taking the external clock i took the internal clock i.e sysclock4 with dividing factor. then it works. i dont know what is the real problem?even i tried with 900MHz in both cases it shows the same result.

 

can any body help me?

 

thanks,

Ramana.