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TMS320F280049C: how to use the Synchronizer for the CLB input?

Aki Li
Genius 10145 points

Part Number: TMS320F280049C

During the configuration for the CLB_INPUT_FILTER, there is a Synchronizer function. I can not detailed introduction for it. Could you please help share how to better use it? What is the use case to enable it? Thank you.

  • 0
    TI__Guru 52220 points

    For asynchronous signal, such as GPIOs or any signal going through Input XBAR etc. The synchronizer must be enabled. It will delay the signal by a clock cycle but it will synchronize it with the CLB clock which is necessary.

    There are driverlib functions which enable the synchronizer on a specific input. Please use them.

    Nima

  • 0 in reply to Nima Eskandari
    TI__Genius 10145 points

    Nima,

    What will occur if the synchronizer is no enabled?  And what about using the input signal from EPWM directly, do we need to enable the synchronizer?  Thank you.

  • 0 in reply to Aki Li
    TI__Guru 52220 points

    The EPWM EVENT signals (CTR=ZERO, etc) are already SYNC signals. EPWM outputs are async. If you don't sync to the CLB clock, you may miss a signal so it is important to synchronize all ASYNC signals.

    You can see which signals are sync/async by looking at the TRM.