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Getting an "instruction fetch exception"

Hello,

     I am getting an "Instruction Fetch Exception". I am using a VisionMid DM814x. I am using SYS/BIOS version "bios_6_32_01_38". The Code Composer Version we are using is v5.0. This exception gets raised at random times. We tried to find a pattern in which that exception gets raised but it is totally random. I tried the debugging tips mentioned in the following link "http://processors.wiki.ti.com/index.php?title=DSP_BIOS_Debugging_Tips#Cause:_Improper_register.2Fstack_handling_in_hand-written_assembly" but nothing seemed to work.

    What are the reasons behind that exception? Is there some way that can help us resolve it? Thank you