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Original question:

Some questions about the FEE on the TMS570LS1227.

TMS570LC4357: Timing for copying virtual sector and erasing a virtual sector in FEE

Veena Saluja
Prodigy 40 points
Part Number: TMS570LC4357

Tool/software:

In FEE , if two Virtual Sectors configured, if there is insufficient space in the current VS to update the data, It switches over to the next VS and copies all the valid data from the other Data Blocks into the current VS to the new one. After coping all the valid data, the current VS is erased and the new one is marked as Active VS. Are there any timings available how long it takes to copy the valid data,  do the erase and mark the new one as Active VS ?

  • 0
    TI__Guru 61830 points

    Hi Veena,

    Veena Saluja said:
    Are there any timings available how long it takes to copy the valid data,  do the erase and mark the new one as Active VS ?

    We don't have any timings for this. 

    And you can roughly calculate the values using the datasheet mentioned programming values.

    For example, if you verify the total programming time for programming 128KB of EEPROM in worst conditions would be 2.6S.

    And let's consider you mapped one physical sector of size 4KB to the one VS:

    Then the programming time might reduce to the 2.6S/32, which is equal to the 81.25mS. This is worst case value, but typical value would be less than of this.

    --
    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Prodigy 40 points

    Hi Jagadish,

    Thanks for the response. Does the programming time mentioned in data sheet include erase and copying over the contents from full sector to empty sector?

  • 0 in reply to Veena Saluja
    TI__Guru 61830 points

    Hi Veena,

    Veena Saluja said:
    Does the programming time mentioned in data sheet include erase and copying over the contents from full sector to empty sector?

    No, it doesn't include erase timing. And i think you no need to include that as well because it after a one VS got full the corresponding sector will be marked for erase and the erase operation will takes place in the background while the writing in next sector was on going.

    So, no need to include the erase timing for this use case. And i think it will include reading (copying) and writing (programming) values in the above calculated timings.

    --
    Thanks & regards,
    Jagadish.