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With regards to GT_Trace tool, I don’t know the meaning of GT_curTime() output?

Our goal in providing functions such as GT_curTime is to make software modlues that use these APIs platform independent.  Depending on which platform you are building for, below GT_curTime there are corresponding OS calls (Linux for ARM, BIOS for DSP...). 

The retun value for all implementations of GT_curTime is a UINT32 which represents microseconds.

Normally, we try to provide this API level details in the doxygen generated documents included within DVSDK; In this specific case, I agree that information on the what the return value represented (micro-seconds) was missing and we are taking steps to correct this.