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Original question:

AM335x / PRU 28-Bit Shift In mode for circular capture

AM3358: PRU GPI 28-bit shift mode synchronization

Gregory Buchanan
Prodigy 160 points

Part Number: AM3358

I am confused as to how data is expected to be synchronized when captured using the PRU GPI 28-bit shift input mode?  Since data will arrive asynchronous to the internal ocp_clk how are bit boundaries detected?  How is metastability avoided?  Is oversampling of the shifted data implied?

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    TI__Genius 15950 points

    Hi Gregory,

    The PRU GPI 28-bit shift mode is a very simple mode.  As you pointed out, the data arrives asynchronously to the internal ocp_clk.  It is up to the PRU software to oversample the shift data to avoid metastability.  

    Regards,

    Melissa