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AM3352 pin mux

Nikhil Tiwari
Intellectual 575 points
Other Parts Discussed in Thread: AM3352

Hi,

I am selecting the pin out of AM3352 using pin mux utility. For SPI1 lines the tool has selected clock and data lines from Mux2 and chip selects from mux1 (IO subset 11).  I was assuming that selecting the signals between two mux modes for any interface will cause IO set violation. Is this fine? Can we select different mux modes for each pin irrespective of its interface.

Thanks & Regards,

Nikhil

  • 0
    TI__Guru 62855 points

    It is not always necessary to select the same mux mode for all signals of an interface to be a valid IO set.  You should be okay if you are using the pin mux tool and it does not indicate a IO set violation for the selected pin mux combination.

    Regards,
    Paul

  • 0 in reply to peaves
    Intellectual 575 points

    Hi,

    I have one more doubt. while selecting the interfaces (IO sets) for MMC2 interface the pin mux tool gave MMC_DATA, CLK and CMD lines from MUX2. It doesn't provides selection of Card detect signal in the same IO set. So i selected SD card detect for MMC2 under mux0. The tool doesn't shows any error for this configuration. Does this means it is a valid IO set and can be used? 

    I have attached the pin mux file for your reference. 8561.PinMuxDesignState_AM335x Rev 2.x.dat 

    Thanks & regards,

    Nikhil

  • 0 in reply to Nikhil Tiwari
    TI__Guru 62855 points

    IO Sets define valid combinations of pin multiplexing options for a set of synchronous signals that have specific timing requirements relative to each other or a clock.  In the case of MMC2, the card detect signal is not synchronized with the clock so it does not need to be grouped with any specific combination of the other signals which are synchronous with the clock.

    Regards,
    Paul