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TMS320F280049: Purpose of partial and immediate function in DCL library

Shengnan Li
Expert 1010 points
Part Number: TMS320F280049

Hi, TI experts,

My understanding of DCL_runDF22_C5(immediate) DCL_runDF22_C5(partial) is to save clock cycles in calculation compare to a full calculation of DCL_runDF22_C4. but the clock cycles they add together(29+60=89) is more than C4 version which is only 71.

Can you explain?

Thanks!

  • +1
    TI__Intellectual 1720 points

    Hi Shengnan,

    The purpose of partial and immediate is for scenarios where you would want to have a saturation clamp (e.g DCL_runClamp_C1), as the full implementation of DF22 (C1/C4) does not have a clamp built-in. In some circumstances, users could also design their program to invoke the partial function in a non time critical section, and subsequently complete the  immediate calculation during the time-critical section. In this perspective, we would save some clockcycles during the time-critical section compared with running the full implemention in time-critical section.

    Nonetheless, the external assembly implementation should be plenty fast (C1 for full implementation, C2 and C3 if you need a clamp) for most applications. Just be sure to also include the .asm file itself when using these external assembly functions, located under the source folder of DCL.


    Best,

    Sen Wang