TMS320F28075: Question about Max Flash Erase Cycles

Chen,

Flash content will not be reliable after that.  Only 20K max is allowed.

Thanks and regards,

Vamsi

Hi Vamsi,

the 20K cycles is for each sector  or for the whole Flash?

if one sector over 20k times, will influence other sectors or not?

From old datasheet , MIN value is 20K, TYP value it 50K, customer want to know why in the latest datasheet this parameter change to Max  20K Max?

Chen,

I remember as below, but I can check again and confirm:

1. It is for the whole flash. 

2. If a sector goes beyond 20K, it will reduce the W/E on other sectors.

3. Maybe the old datasheet is a preliminary one and not the RTM version?

Thanks and regards,

Vamsi

Hi Vamsi,

Could you advise  the detail why it is for whole flash and why reduce the W/E on other sectors?

The datasheet is SPRS902A not preliminary  one, customer need TI explain  the detail reason why change this parameter from TYP 50K to Max 20K.

Thanks!

Chen,

DS spec is arrived based on the characterization and qualification data of the flash bank/pump.

We will review the data and let you know the details early next week.

Thanks and regards,
Vamsi

Chen,

We spoke to the DS spec team.  Flash will work correctly for a minimum of 20k cycles, but may degrade if cycled more than 20k.  Flash will typically continue to operate correctly for up to 50k cycles but any amount over 20k is not assured.  The 20k spec was changed as MAX requirement to make sure the users interpret it accordingly. 

Thanks and regards,

Vamsi

HI Vamsi,

For  "Flash will work correctly for a minimum of 20k cycles, but may degrade if cycled more than 20k", what the detail means of degrade?

Could you advise below answer detail ?

1.  why 20K times, is not for each sector but for the whole flash.?

2. If a sector goes beyond 20K, it will reduce the W/E on other sectors?