Execution speed difference

mudigere

Other Parts Discussed in Thread: TMS320DM648

Hello,

I am new to this field.

Will there be any speed difference between C64x+ and C674x?

We have two boards one custom board with TMS320DM648(C64x+) and another C674x EVM board from TI.

And we tried to run memcpy() on both the boards

and found that C674x EVM is slower than the custom board with TMS320DM648(C64x+).

C674x EVM takes 1.3 times more time than DM648 for the same amount of memory copy(1MB).

note: both DSP are running at the same speed.

Please let me know if there is any suggestion.

Regards.

0 Muhammad Haque over 14 years ago

It is possible as these are different device and the internal architecture are different as well.

Key contributors are:

Memory being used: On vs off chip.
SoC topology (bus interconnects) – how many bridges/SCRs/pipeline stages between the DSP and the memory being accesses. And the operating speed for the interconnects.
If using off chip DDR then depends on DDR frequency, width, etc

0 mudigere over 14 years ago in reply to Muhammad Haque

Thank you,

I believe this difference could be bcos of the cache settings,

I shall check that and come back.

Regards.

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