DSP Trace Ticks profiling

Hi 

I used GT_Trace to collect the time difference between trigger time and completion time.

Eg:

1st Attempt

[DSP] @5,320,291tk [+3 T:0x00000000] codec.edma - GPIO Trigger

[DSP] @5,627,793tk [+3 T:0x00000000] codec.edma - Complete Processing

2nd Attempt

[DSP] @6,492,935tk [+3 T:0x00000000] codec.edma - GPIO Trigger

[DSP] @6,884,080tk [+3 T:0x00000000] codec.edma - Complete Processing

With reference to this site, http://processors.wiki.ti.com/index.php/Codec_Engine_Profiling , the trace output is different from mine.

It has microseconds instead of tk.

My DSP clock is at 300000 returned by GBL_getFrequency().

I would like to know how to calculate the time difference.

Thanks.