How can I get the measured value of Total Conversion Time on board?

Dear,

Could someone give me your advise for following?

Related posts:
http://e2e.ti.com/support/dsp/tms320c5000_power-efficient_dsps/f/109/t/188803.aspx

  Device: TMS320VC5507ZHH

I'd like to know how I can get the measured value of Total Conversion Time on board.
Because, I can not get measured value that should be equal with calculated value of AD Conversion time.

  My question:
  I think ADCBUSY bit in ADCDATA Register becomes high while Sample and Hold process and Conversion process.
  In other words, ADCBUSY=1 during 46.6uS, Total conversion time, in case of following Figure.
  Am I right?

 

Regards,
Okayama