Dataflash EEPROM with DMA

Mathias Reinhard

We are planning on using a TSM570x with Flash EEPROM.

At certain triggerpoints we have to write large data blocks (~10k) to EEPROM. Since the CPU will still be doing some other stuff at this time, i was wondering if it is possible to use DMA to write to the EEPROM, just to reduce CPU load?

over 12 years ago

0 Paul Blecher over 12 years ago

TI__Intellectual 1115 points

Hi Mathias,

No it is not possible to use the DMA to program EEPROM or other nonvolatile memory. DMA can only be used to access device and peripheral RAM memory.

Best regards,
Paul B.

0 Paul Blecher over 12 years ago in reply to Paul Blecher

TI__Intellectual 1115 points

One more addition to this: If the data for your EEPROM is coming from one of the peripherals, you may still find it useful to use the DMA to transfer data from the peripheral RAM to the main device RAM for temporary storage before it is programmed into EEPROM.

0 Mathias Reinhard over 12 years ago in reply to Paul Blecher

Prodigy 80 points

Thanks for your Help.

One more question, that is not directly related: In the F021 Flash API Manual I read that Programming can be done from 1 byte up to the memory bank width. How do i find out my memory bank width for Bank7(EEPROM)? The user Manual does not specifically name that value.

In the UserManual there are values tprog(288bits) for Bank 0/1 and tprog(72bits) for Bank 7. Ist that my bank width (72/64 bits)?

0 Paul Blecher over 12 years ago in reply to Mathias Reinhard

TI__Intellectual 1115 points

Mathias,

This information should be in the datasheet for the specific device that you are using

Paul B.

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Dataflash EEPROM with DMA