How many Datas is FEE able to save

Frank Freihube

Other Parts Discussed in Thread: RM48L952

Hi,

we are using a RM48L952 with 64k of EEPROM-Emulation-Flash and we are using 4 virtual sectors. Now we wonder how many kb of data we will be able to save. We came to two possibilities but are not sure which one is really implemented:

1)(more space, less erase cycles)
The FEE-driver uses (No_of_virtual_sectors - 1) sectors to save the data and one VSector for the copy process. In our excample we would have 3*(64/4)KB =48KB of space to save our data.

2)(less space, more erase cycles)
The FEE-driver uses only one virtual sector to save the data and all other sectors for the copy process. (VS1 full -> write to VS2, VS2 full -> write to VS3 and so on). In this case we would have only 64/4KB = 16KB of space to save data.

Can somebody tell us which way is the correct/implemented one?

Regards,
Frank

over 11 years ago

0 Enrique Lizarraga over 11 years ago

TI__Expert 4580 points

Hello,

We have received your questions. Our expert will review this and provide some feedback soon.

Regards.

0 Vishwanath Reddy over 11 years ago in reply to Enrique Lizarraga

TI__Mastermind 19365 points

Hi Frank,

FEE driver is implemented with point 2(VS1 full -> write to VS2, VS2 full -> write to VS3 and so on). You can also combine two physical sectors in to one virtual sectors(VS1=sector1+sector2, VS2=sector3+sector4). In this way, you would have 32KB of space to save data.

Note: FEE driver is not validated on RMx devices. It is validated on TMS570x devices.

Regards,

Vishwanath Reddy.

0 Frank Freihube over 11 years ago in reply to Vishwanath Reddy

Intellectual 350 points

Hi Vishwanath,

thanks for your answer.

To your note: We know this too, but we have to use this chip.

Whilst choosing a fitting chip the TI-Support told us that this chip would be able to store at least 1.5mb of data (using flash bank 1). Since programming this chip we recognised not only that we can not use bank 1 but also that we (officially) can not use bank 7 (by the way it is working pretty fine when we extract the files from a HALCoGen-TMS570x-Project).

Why does the RM48 has a Flash Bank which is only supposed to emulate EEPROM if the chip does not support EEPROM-Emulation?

By the Way according to the datasheet(SPNS177B) of the RM48L952 it supports emulated EEPROM.

Regards,

Frank

0 Vishwanath Reddy over 11 years ago in reply to Frank Freihube

TI__Mastermind 19365 points

Hi Frank,

We do have plans to validate FEE driver on RM48x in future.

Regards,

Vishwanath Reddy.

If my reply answers your question please click on the green button "Verify Answer"

0 Frank Freihube over 11 years ago in reply to Vishwanath Reddy

Intellectual 350 points

Hi Vishwanath,

can you specify what "in future" means? Will it be available in weeks, months or years?

If it would take several weeks or some months it would be fine for our project but if it would take years we will have to think about our chip decision.

Regards,

Frank

0 Vishwanath Reddy over 11 years ago in reply to Frank Freihube

TI__Mastermind 19365 points

Hi Frank,

It would be validated by March'2014.

Regards,

Vishwanath Reddy.

If my reply answers your question please click on the green button "Verify Answer"

Arm-based microcontrollers

Arm-based microcontrollers forum

How many Datas is FEE able to save