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EZdspC5505 Rev B ClkOut pin not responding

Tommy Hosman
Intellectual 260 points

I am trying to look at the clkout pin that is provided by the C5505 chip on the EZdsp.  

I have talked to Spectrum Digital support and they said that it is a silicon related issue.

I have made sure that it is enabled by setting register ST3_55 bit 2 to 0. I have also tried setting CCSSR (0x1C24) for the system PLL clock. None of this appears to have enabled the clkout pin. 

Please let me know any issues or other steps that might help with this issue.

Thanks,

Tommy

  • 0
    TI__Mastermind 30140 points

    Hi Tommy,

    Can you try to enable/disable the CLKOUT pin from CCS4?

    When I connect to the C5505 eZdsp, the CLKOUT has a 100MHz clock on it after GEL initialization.

    Then with the Register View (View -> Registers -> CPU -> ST3_55) I can change CLKOFF (bit 2) to DISABLE (0x1) or ENABLE (0x0).

    Probing the CLKOUT pin shows either the 100MHz clock or a 0V signal depending on this bit.

    Are you setting these registers in your program?

    Hope this helps,
    Mark