TMS320F28388D: What is the status of the USB peripheral bootloader clocking issue?

Howard Li 2

Hi,

A year ago I brought up an issue that the TMS320F28388D on-chip USB peripheral bootloader does not work with Revision B control cards.

The cause was determined to be the default 25 MHz clock speed. Modifying the clock speed to 20 MHz by moving a certain resistor resolved the issue.

Seeing as Revision B is still the latest version, I assume that the issue has yet to be resolved. A post by Cody Watkins in the original topic said this issue will be noted in the documentation, but neither the TRM, Datasheet, nor the Errata make any mention of this issue in the latest versions as of this post.

Sincerely,

Howard Li

over 4 years ago

0 Kevin Allen18 over 4 years ago

TI__Mastermind 45606 points

Hi Howard,

Howard Li 2 said:
Seeing as Revision B is still the latest version, I assume that the issue has yet to be resolved.

This ControlCard revision is the latest and will not be changed, 25 MHz clock source will remain the default. The primary reason being that EtherCAT needs to use a 25 MHz clock to the f2838x and PHY devices.

I apologize that the documentation still needs to be improved, I will make sure the respective requirements are made clear in the next device datasheet revision. Please see the relevant E2E post below I responded to a few weeks ago, it has relevant info.

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1066583/tms320f28386d-usb-boot-osc-frequency-limit

Best,

Kevin

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28388D: What is the status of the USB peripheral bootloader clocking issue?