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Recommended Main Function Cycle Times for Memory Stack

Last updated: 2018-12-11
Question:

Which Main Function Cycle Times can be recommended for the Memory Stack?

Answer:
For the NvM_MainFuction, 10ms are enough for most projects. A faster cycle time like 5ms has only a very small benefit compared to the costs of runtime.

Depending on the amount of data to be written to flash during shutdown and read from flash during startup, it is recommended either to trigger Fee_Mainfunction every 5ms or every 2ms. Important for a fast execution of the search operations is that Fls_MainFuction is triggered twice as often as Fee_MainFuction.

Because Ea and SmallSectorFee behave very similar, the recommended cycle times are the same. Depending on the amount of data to be written to Flash/Eeprom during shutdown and read from Flash/Eeprom during startup, it is recommended either to trigger the Fee_Mainfunction of the SmallSectorFee_MainFunction/Ea_MainFunction every 10ms or every 5ms. Triggering Fls_MainFunction/Eep_MainFunction twice as often as Fee_Mainfunction of SmallSectorFee_MainFunction/Ea_MainFunction has a benefit in case some blocks with more than one instance are configured.
 
Note:
A block of the SmallSectorFee or Ea needs more than one instance in case the estimated write cycles during the whole life of ECU are bigger than the guaranteed write cycles of the device by semiconductor manufacturer.
 
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2018-12-11
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