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Original question:

AFE7950: Programming NCO phase offset from Latte

AFE7900: NCO programming through SPI

Elan
Prodigy 120 points
Part Number: AFE7900

Tool/software:

Hi,

I have done the programming of AFE and LMK through SPI lines and I have verified the AFE programming through the vios in vivado. So can we program the NCO frequency and attenuation through the same SPI lines?

Regards,

Bala

  • 0
    TI__Genius 14961 points

    Hi Bala,

    Just to confirm, are you asking if it is possible to update the NCO frequency and DSA value through SPI writes? If so, then yes it is possible. Below is an example of how to update the Tx NCO frequency through register writes.

    Regards,

    David Chaparro 

  • 0 in reply to David Chaparro
    Prodigy 120 points

    Hi David,

    I have done that AFE79xx SPI bringup programming of AFE and LMK. By using the SPI line of AFE, can we program the NCO and attenuation?

    Regards,

    Bala

  • 0 in reply to Elan
    TI__Genius 14961 points

    Hi Bala,

    Yes, the register writes above can be used to update the Tx NCOs. For the DSA settings you can do the same except that you need to open the DSA page and write to the Tx and Rx DSA registers. Please note that you can reference the setTxDsa and setRxDsa CAFE functions for the registers used. The CAFE library is available in the AFE79xx secure resources folder.

    Regards,

    David Chaparro