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DM648 NOR flash not working

Ahmed 10245
Intellectual 450 points

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       

  • 0
    Expert 1160 points

    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

  • 0 in reply to Victor Ivanov
    Intellectual 450 points

    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

  • 0 in reply to Ahmed 10245
    Expert 1160 points

    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

     

  • 0 in reply to Victor Ivanov
    Intellectual 450 points

    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

  • 0 in reply to Ahmed 10245
    Expert 1160 points

    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

  • 0 in reply to Victor Ivanov
    Intellectual 450 points

    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