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DAC38J82EVM: EVB J16 signals

Ilya Michlin
Prodigy 120 points
Part Number: DAC38J82EVM
Other Parts Discussed in Thread: DAC38J82

Hello,

I am trying to understand the purpose of all the signals which are connected to the J16 in the EVM of DAC38J82. I managed to understand most of them exept the ones that connected to the CPLD.

What is the purpose of these signals:

  • FMC_SEN_DAC
  • FMC_SEN_LMK
  • FMC_B5
  • FMC_B6
  • FMC_DIR_CONTROL

Can you please help me with that?

  • 0
    TI__Guru* 91947 points

    Ilya,

    These signals provide customers with an option to program the DAC and LMK device using a SPI interface across the FMC connector instead of the on-board USB interface. The setting of the shunt on JP3 determines which interface is to be used. By default, this is the USB.

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 120 points
    Hello Jim,
    Thank you for the quick responce.
    I currently develop a PCB that will connect to the FMC connector and I need to understand what every signal is doing. Signals purpose such as "FMC_SCLK" are self explanatory by the name while signals such as "FMC_B5" are not.
    For that reason, can you please explain what are those five signals are doing?
    Thank you.
  • 0 in reply to Ilya Michlin
    TI__Guru* 91947 points

    0574.CPLD files.zipIlya,

    Some of the signals are spares, such as the one you mentioned. I have attached the source code for the CPLD. I have never used the FMC interface and cannot guarantee the code will work as is. Please feel free to make changes to this code to suit your application needs.

    Regards,

    Jim