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DM648 NOR flash not working

Hello All,

          I had been working on Lyrtech DM648. Now I hv made my customized board by considering Original Schematics, The problem is, I am unable to write/read any data in its NOR flash. The only anomaly b/w schematics is the removal of MUX that swiches control between video ports and Flash, as I am not using the video ports so I hv removed the MUX and made a direct connection of flash with the DSP. According to the datasheet MUX has almost zero delay so I believe that there r no timing issues. I want ur suggestions to resolve the issue.Is the mux really necessary for proper communication with the Flash?

Thanks & Regards
Ahmed       

  • Hello Ahmed,

     

    we also don't use MUX on our customized board and DM648 is directly connected to the NOR flash. Now, we don't have any problems with writing/reading data in the NOR flash. However, at the beginning we didn't connected the reset pin of the flash chip and it didn't work. Then, we provided a proper reset and it started working normally.

     

    BR

    Victor

  • Thanku Victor  for confirming the hardware design issue as I was really worried about it. Is there any basic Read/write example for NOR flash ? currently I am using flash burn utility to access flash, Do I need to change it for customized board ? I am gonna recheck the connections.

    Thanks & Regards

    Ahmed

  • Hi Ahmed!

    I use nor.c and nor.h from DVSDK\FlashUtility.  I did some minor changes to use them in my CCS4 project. Since that I use the same files for DVDP and our custom board.

    Victor

     

  • Hi Victor!

                     Your previous replies helped alot. That was realy a hardware connectivity issue, now I can easily read/write in the Flash (grateful to u). I need a little more favour because my custom board is not booting from Flash (EMIF NOR boot). Do I need to change UBL.ais or flashutility program in DVSDK for customised board or the actual application is good enough to make the board work. I donot have PCI,audio or any video interface on my board.

     

    Thanks & Regards

    Ahmed

  • Hi Ahmed!

    I haven't tried booting from the Flash on our custom board yet. I just tried writing/reading Flash and switched my attention to other problems. I am not expecting any differences in the booting of the DVDP and a custom board.  However, if somebody knows better I would also be interested.

     

    Best Regards

    Victor

  • Victor !

                 Its been very nice conversation with u, I am currently working on booting the device with NOR, lets see where it ends .

    Thanks & Regards

    Ahmed