Converting clock ticks to actual time?

MikeH

Other Parts Discussed in Thread: OMAP-L138

When using CCS4's target (profile?) "clock" (at the bottom of the workbend window) to measure the number of "ticks" used by an algorithm, how do I convert the number of ticks to actual time (milliseconds)? The target is an OMAP-L138 and I am running the DSP at 300MHz. I assume the "clock" value measured is directly related to the DSP clock, but what it the mathematical relationship? Where can I find this documented?

Thx

MikeH

over 14 years ago

0 desouza over 14 years ago

TI__Guru**** 169224 points

MikeH,

The profiler clock displays the direct CPU cycle count, therefore its value must be multiplied by ¹/_CLKto convert it to seconds.

As far as I know the ARM9 has a direct relationship between the clock and the CPU cycles, therefore a simple instruction like NOP located in internal memory (external has waitstates associated with it) should just jump one unit in the counter; other instructions may have stalls like MOV or B.

Best regards,

Rafael

0 MikeH over 14 years ago in reply to desouza

Guru 15580 points

Rafael,

Thanks for the guidance. Just to make sure I understand your lingo......

If the DSP is running at 300MHz, then the "CPU cycle" = 1/300MHz = 3.3ns? If my algorithm is taking 10,000 "clock cycles", then the time consumed by my algorithm is 10,000 * 3.3ns = 33uSec?

MikeH

0 desouza over 14 years ago in reply to MikeH

TI__Guru**** 169224 points

MikeH,

Yes, you are correct!

Cheers,

Rafael

0 MikeH over 14 years ago in reply to desouza

Guru 15580 points

Thanks Rafael

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Converting clock ticks to actual time?