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TMS320F28034: flash erasing time

Part Number: TMS320F28034


Hi, my customer is using F28034.

They will erase the flash when they upgrade their application software. Normally it takes 6s to erase, but they found one need 8s and one need 11s out of 50 F28034.

Because they have to set a time limit for flash erase(otherwise they cannot tell if the upgrade is successful),

so they are curious why some sockets take longer time to erase?(same environment, all are new devices)

And how long should they set the time limit?