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TMS320VC5509A: How to bring frame sync pulse after data.

SHIRORINGO Yoshikazu
Prodigy 10 points

Part Number: TMS320VC5509A

Hello! I'm planning to use McBSP of TMS320VC5509A to send channel number and voltage to external DAC.

DAC requires frame sync pulse [FSX] after one word of data [DX], bit I couldn't find the way.

Is it possible to output FSX after DX?

  • 0
    TI__Guru 65405 points
    The team is notified. They will post their feedback directly here.

    BR
    Tsvetolin Shulev
  • 0
    TI__Guru**** 161600 points
    Hi,

    Looking at the MCBSP reference guide, I see that:
    "When FSR and FSX are outputs, implying that they are driven by the sample rate generator, they are generated (transition to their active state) on the rising edge of internal clock, CLK(R/X). Similarly, data on the DX pin is output on the rising edge of internal CLKX"

    Or the MCBSP can generate frame sync on every DXR-to-XSR copy.

    So the MCBSP does not seem to be able to output frame sync after [DX].

    Have you considered using a GPIO to output the frame sync separately? Of course this would require modifications in your McBSP driver.

    Best Regards,
    Yordan