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TMS320F2808: Flash erase time is too long

Felix Risch25
Intellectual 1110 points
Part Number: TMS320F2808


Hello team,

my customer is facing an issue with the flash erase time. They are using the device for quite some time, but now they noticed with 3 devices (same lot number) that the device has an erase time of approx 28 seconds. Other devices work well in the same application, where the flash erase time is 8 seconds.

Why is the erase time so high?

Thank you and kind regards,

Felix

  • 0
    TI__Guru 55700 points
    Felix,

    Please check the link below and let me know if you have any further information.

    processors.wiki.ti.com/.../FAQs

    Regards,
    Manoj
  • 0 in reply to Manoj Santha Mohan
    TI__Intellectual 1110 points

    Thank you for your response. The customer would like to know the following as well:

    The Erase operation is a dynamic operation - pulses are applied until the erase is complete or the maximum number of pulses is reached and the erase fails. Thus the amount of time it takes to erase will vary per attempt and per sector. It will change at different temperatures, and in addition it will also change with ‘the number of previous erase/program cycles’ (flash endurance). Hence, it will also change from part to part. The system related issues/parameters (supply voltage, ripple/noise etc) will be on top of this. This will change with temp as well as during the lifetime of the flash.

     

     

    We can see that if we change one processor with another one, the flashing process is much shorter on the same PCB. Can you give me a statement how much influence does „The system related issues/parameters (supply voltage, ripple/noise etc) will be on top of this.“ have?

    Thank you and kind regards,

    Felix

  • 0 in reply to Felix Risch25
    TI__Guru 55700 points
    Felix,

    I will look into this statement and get back with you.

    Regards,
    Manoj
  • 0 in reply to Felix Risch25
    TI__Guru 55700 points
    Felix,

    Part to part flash erase variation has more to do with the prior device state (Voltage threshold level of the individual flash bits) than to do with supply voltage variations / ripple noise. If the customer stays within recommended operating condition the erase time shouldn't dramatically change because of supply voltage / ripple noise.

    Regards
    Manoj