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TMS320lf2406a flash lock problem

Jernej Skvarc
Prodigy 50 points

Hi!

Few days ago our production faced a problem when downloading firmware to a TMS320LF2406APZS processor through RS232 connection. 100 devices were planed to be programmed, but 3 of them showed a locked FLASH memory and could't be programmed. All devices were new. Similar problem sometimes showed up in development phase when using JTAG programming, but never at first time programming.

We also tried to program before mentioned 3 faulty devices with JTAG interface, but the result was the same as with RS232 programming - processor's FLASH was locked and it couldn't be programmed. The protection code usualy used showed invalid. During every programming phase there was no power loss present.

Is this some kind of silicon bug? Did it hapen to someone else? Can it be caused by a bad PCB design / power supply design? Maybe exists an important power-up sequence of supply voltages that must be followed (5V FLASH programming supply and 3.3V logic supply)? When the processors with locked FLASH were replaced with new ones, everything worked OK.

 

Best regards,

Jernej Skvarc

  • 0
    TI__Guru* 93800 points

    Jernej Skvarc said:
    Few days ago our production faced a problem when downloading firmware to a TMS320LF2406APZS processor through RS232 connection. 100 devices were planed to be programmed, but 3 of them showed a locked FLASH memory and could't be programmed. All devices were new. 

    Jernej,

    Were the devices obtained through a TI distributor or through a broker?  We have seen some issues were devices were not purchased through a normal TI channel. 

    -Lori

  • 0 in reply to Lori Heustess
    Prodigy 50 points

    Lori,

    thank you for your reply. All TI devices in our company are obtained through a local TI distributor - in our case EBV elektronik from Ljubljana (Slovenia).

     

    Best regards,

    Jernej

  • 0 in reply to Jernej Skvarc
    TI__Guru* 93800 points

    Jernej Skvarc said:

    Lori,

    thank you for your reply. All TI devices in our company are obtained through a local TI distributor - in our case EBV elektronik from Ljubljana (Slovenia).

     

    Best regards,

    Jernej

    Jernej,

    I suggest working with your local distributor to get some replacement parts and/or send those in for failure analysis.

    Regards

    Lori