CSL_tscRead() function returns incorrect value

Hi,

I am facing inconsistency issue in library function CSL_tscRead().

below is simplified version of concerned code - 

main()

{

    uint64 ui64TimeStamp = 0; 

    CSL_tscEnable ();

    ui64TimeStamp = CSL_tscRead(); 

    /*................ Some other code ................ */

}

Most of the time CSL_tscRead() returns proper value of cycle count but sometimes it returns unexpected huge values.

e.g. value of ui64TimeStamp from on of execution outcome is  18446744072116738712 

I am using C6670 EVM board with Below mentioned software products -

SYS/BIOS    -    6.34.2.18

DSPLIB c66x    -   3.1.0.0

MCSDK PDK TMS320C6670    -    1.1.2.5

Could you plese help me in understanding what might be going wrong here ?

Thanks,

Jitendra