Flash Memory Replacement

Ilich Guerrero

Other Parts Discussed in Thread: OMAP-L138, OMAPL138

Dear TI and e2e community.

We’re developing a video application using the C6748 DSP. We designed a custom PCB based on the LCDKC6748 (same DDR2 and same NAND Flash). Everything works fine. But recently we received a new customer requirement. This consists on a memory change (the NAND flash by a spi flash). Now we’re exploring solutions, but we have some concerns about this change, those are:

Application performance. Right now our program application resides in the NAND flash and the cmd file configuration (or the AISgen configuration) moves the program into the DDR2. Is this possible to do the same with the spi flash memory? otherwise the performance can be reduced, right?
Programing the spi flash. Right now we’re programing the NAND flash with the AISgen and the sfh_OMAP-L138. Are there equivalent procedures to do the same with the spi flash?
Power consumption. When we not using the spi flash, is it possible to disable their power supply?
Are there a spi flash recommended for this change?

Thank you very much and every help is welcome.

over 10 years ago

0 Antony Samsunil over 10 years ago

TI__Expert 4760 points

Hi Guerrero,

You can replace the NAND flash with SPI flash, all you need to do is create to a boot images for SPI flash -> burn the image and set the C6748 boot mode to SPI flash

NOTE:

SPI devices support speeds up to 33 MHz
SPI flash chips must use 24-bit addressing which is only 16MByte

Please refer the below wiki link for more details.

http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L138

The performance is depends upon the size of the data you move and how frequent you access the memory for data transfer.

You can use any flash with SPI interface that meets the C6748 power and timing parameter, for power consumption most of the SPI flash consumes very little power or you can disable the power through external switch (using MOSFET) again this will add cost to your BOM and some MOSFET leakage current, you need to do trade-off between these two options.

Regards

Antony

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0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

We have a our 3rd party EVMs Spectrum digital EVM or LogicPD EVM which has SPI flash for storage.
Also we have "SPI flash" CCS writer code and OMAPL138 (C6748) flash utils software to flash the code into SPI flash.

Are there a spi flash recommended for this change?

Please refer to the SDI EVM or LogicPD EVM schematics for SPI part and choose accordingly.

0 Ilich Guerrero over 10 years ago in reply to Titusrathinaraj Stalin

Intellectual 555 points

Thank you Antony and Titus.

Do you think that the above SPI memory can help us?

www.digikey.com/.../1889059

Thank you again

0 Antony Samsunil over 10 years ago in reply to Ilich Guerrero

TI__Expert 4760 points

Guerrero,

Yes the part is good .

Disclaimer:
The recipient is encouraged to perform all due diligence with respect to design and analysis. For committed performance and functionality of TI devices, please refer to the device’s Data Manual.

Regards
Antony

0 Ilich Guerrero over 10 years ago in reply to Antony Samsunil

Intellectual 555 points

Thank you a lot
I'll test it.

0 Ilich Guerrero over 10 years ago in reply to Ilich Guerrero

Intellectual 555 points

I was able to accomplish the task, now I'm able to booting from Flash memory.
Thank you a lot

0 Titusrathinaraj Stalin over 10 years ago in reply to Ilich Guerrero

TI__Guru** 116100 points

Sounds good.
Thanks for your update.

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Flash Memory Replacement