Using the STR91xFA external memory interface (EMI) AN

[kais]

Posted on June 24, 2008 at 18:51

Using the STR91xFA external memory interface (EMI) AN

[akar]

Posted on May 17, 2011 at 09:52

Hello Eris,

This document is very useful for us, thank you very much. We used this document, STR912FW44 and MR2A16 MR Ram and programmed our board. If we write 0x1234 (16 bits hex value) to 0x30000000 EMI adress we read it back as 0x1234 and everything is OK. But if we write 0x12345678 (32 bits hex value) to 0x30000000 EMI adress we read it back as 0x12341234 and we fail. How can we solve this problem? Thank you very much for your concern.

[kais]

Posted on May 17, 2011 at 09:52

Hi STR9' lovers,

Can somebody tell me if the application note ''Using the STR91xFA external memory interface (EMI)'' already published in the Web is helpful and matches your needs?

http://www.st.com/stonline/products/literature/an/14064.pdf

Your satisfaction is our goal. Regards, Eris. ;) ;)

[kais]

Posted on May 17, 2011 at 09:52

Hi akar,

At first, thanks for your valuables feedbacks. Regarding your issue I'm unable to reproduce it, so it will be helpful if send to me an example jut reproducing the issue. It will be great if you send your schematic as well. Kind regards, Eris.

[akar]

Posted on May 17, 2011 at 09:52

Hello Eris,

I apologize, because this problem is our mistake. We designed an Arm7 board and programmed it. After that we carried our project to Arm9. In Arm7 we connected 16 bit MRAM device MRAM AD0 pin to Arm7 AD1 pin and it worked well. But in Arm9 we have to connect MRAM AD0 Pin to Arm9 AD0 pin and choose EMI_Bank_MemWidth as EMI_Width_HalfWord. We never do it so and this problem happened. Thank you very much for your concern.

[hg-chen]

Posted on May 17, 2011 at 09:52

What is the hardware schematcis (or board) for this application?

[lillian_200601]

Posted on May 17, 2011 at 09:52 The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6oW&d=%2Fa%2F0X0000000bw3%2FocDa113zemC7DCx.U3rNpbKekwS8PHvsxjOvdP7t370&asPdf=false