• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 104 subscribers
  • Views 5916 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

What is efuse register?

Igor Janjatovic
Prodigy 40 points

What is efuse register? Can I change it, for example can I change MAC address? Once I change it, is it non-volatile?

Or is efuse register programmed by TI only once and can't be changed later?

I searched for "efuse" through Technical Reference Manual but there is no explanation for it. There seems to be many such registers but I still don't understand what it is in general.

  • 0
    TI__Intellectual 2725 points

    e-fuse registers are used for storing device specific features (Device ID, Version, MAC Address etc...) . The device features are read only and e-fused into the device. They can't be changed by the customer.

    The MAC addresses programmed into the internal e-fuses will be from the TI address pool.  Customer will need to add some type of storage device (Flash, EEPROM) which contains their MAC addresses if they want to use addresses from their own address pool.

  • 0 in reply to Gururaja Hebbar
    Prodigy 90 points

    Thank you very much! I understand your mean.

    The mac in e-fuse,it is only in my network,so  I do not need alloct  the mac again. I use mac in e-fuse of am335x.

  • 0 in reply to Gururaja Hebbar
    Intellectual 850 points

    The AM335x Technical Reference Manual says in section 26.1.8.6.1.2:

    The default Vendor ID and Product ID can be automatically overridden by the customer by programming the Efuses that are used to store these values.

    That seems to indicate some Efuses are customer-programmable. Is that right, and if so, how can it be done?

  • 0 in reply to Craig McQueen
    TI__Guru 55895 points
    Efuses are programmed by TI during final test and cannot be changed. The USB PID/VID value is the same in all AM335x devices. The ROM code uses these values when booting from USB.

    I think the TRM is trying to say the respective software driver may need to use a different USB VID/PID value that represents the function implemented by the driver.

    Regards,
    Paul