• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 566 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TIVA USB ROM Boot loader

Santosh PG
Expert 1590 points

Hi,

We want to upgrade firmware over USB and using USB ROM Bootloader, after refering to the datasheet

it is understood USB is clock sourced from external crystal and doesnt works for the internal PIOSC.

So please confirm if external crystal is required and what is minimum crystal value?

Best Regards,

Santosh.

  • 0
    TI__Expert 6140 points

    Santosh,

    The main oscillator must be connected to one of the following crystal values in order to correctly
    generate the USB clock: 5, 6, 8, 10, 12, 16, 18, 20, 24, or 25 MHz. Only these crystals provide the
    necessary USB PLL VCO frequency to conform with the USB timing specifications.

    This is listed in the System Control chapter in the datasheet.

    Hope that helps.