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Share the TX/RX clocks and frame sync signals on the McBSP

steve foster79764
Prodigy 230 points
Other Parts Discussed in Thread: AM1808

The same external frame sync and external clock is going to the transmit and receive side of the McBSP interface. Is there a way to program the AM1808 to use one sync input for the two TX/RX inputs? Same question with the clocks. The data loop mode comes close to doing this but shorts the data together.

 

Thanks

  • 0
    TI__Guru*** 125430 points

    steve foster79764 said:
    Is there a way to program the AM1808 to use one sync input for the two TX/RX inputs? Same question with the clocks.

    Sorry, that's not possible.  You need to connect the CLK signal to both CLKR/CLKX and you need to connect the frame sync to both FSX/FSR.

    You might instead use the McASP.  It's very similar to the McBSP though if you set ACLKXCTL[ASYNC]=0 then the transmit clock and transmit frame sync are used for receive as well.  (There is an inverter for the clock.)  I see you asked about McBSP vs McASP in the past so perhaps this isn't an option.  Was there anything in particular that makes the McBSP a requirement, or did you have some existing code, etc?

  • 0 in reply to Brad Griffis
    Prodigy 230 points

     There is no preference over McBSP and McASP. Just worried about line loading and using up the I/O.