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Can 6455 Clock at 1 GHz / 66 MHz

Geof Cohler
Intellectual 1880 points

Hi,

From a client of mine:

  • According to your SPRAA89 app note, section 5.2, paragraph 2, the maximum internal core frequency when accessing internal ROM is limited to 750 MHz and CLKIN1 is limited to a maximum of 50 MHz.  I was planning to operate the core at 1 GHz with an external CLKIN1 at 66 MHz (supporting details below).  Can you help clarify this 750 MHz/50MHz maximum requirement?  Is this old data based on this nearly 3 year old app note?  If not, can you help to explain how to operate the core at 1GHz with this 750 MHz core limit?

 Is this allowed?

Thanks very much.

Best regards,
Geof

  • TI__Mastermind 24340 points

    Hi,

    Please see page 84 of the datasheet:

    http://www.ti.com/lit/gpn/tms320c6455

    " When accessing the internal ROM of the DSP, the CPU frequency must always be less than 750 MHz. Therefore, when using a software boot mode, care must be taken such that the CPU frequency does not exceed 750 MHz at any point during the boot sequence. After the boot sequence has completed, the CPU frequency can be programmed to the frequency required by the application."