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Hi Owen,
If PLL is not bypassed there is only garbage on ECLKOUT.
Please refer to the C6713 data sheet page no 77.
http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tms320c6713&fileType=pdf
We have to wait for some time for safer switching from PLL bypassed to PLL normal mode.
Try the attached "LED blink" example code which has PLL init code.