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Where to obtain OMAP L138 PCB file?

Anonymous
Anonymous
Other Parts Discussed in Thread: OMAP-L138, TMS320C6748, AM1808

Hi,


Is there a place to get PCB files for a working OMAP L138 board?


From LogicPD website:

Are schematic, PCB layout, and BOM files available for the OMAP-L138 EVM?

Schematic, PCB layout, and BOM files are availble in PDF format for the OMAP-L138 SOM-M1, TMS320C6748 SOM-M1, baseboard, UI board, and 4.3" WQVGA LCD after an account has been created on www.logicpd.com.

Orcad schematics and PCB layout files are only available for the baseboard and UI board.


This basically says that Orcad PCB files are not obtainable even if purchasing the board, and what the "PCB layout in PDF" mean, I guess, is something like the Gerber file showing how traces are routed on each layer separately, but not as an integral PCB board that you can navigate here and there freely, as in OrCAD.


However for SpectrumDigital, they do put both schematic and PCB file on the website without requiring registration/buying, a very big contrast from LogicPD policy.


There is certainly a big facilitation if schematic and PCB files are immediately available. For OMAP L138, is there a place to find that?




Zheng


  • 0
    Prodigy 230 points

    Well one thats fully open is the hawkboard that gives you schematics and gerber files for it http://www.hawkboard.org/

    But note that it has a design flaw of breaking the gnd plane between the omap and the ram chip (The documentation says not to do that) so most boards
    now end up locking up when trying to boot linux (For some reason with the old different spec parts it worked), but i have one and running raw C on it works great.

  • Anonymous
    0 Anonymous in reply to Bernard Klinc

    Bernard,


    I was out in another city and didn't have Internet access until this evening, and I am sorry for replying late.


    I found a thread Hawkboard Issues - TI Annoucement which contains some bitter complaints for Hawkboard made by Innovative (an Indian company), and no definite answer on where the replacement by Special Computing has been released.


    However, I also read a relevant discussion on PCB resource for OMAP L138:



    Posted by Huy Pham

    on 16 Apr 2011 12:13 PM


    Prodigy260 Points

    ..............omitted.................

    Although the LogicPD board does not support DDR2, we have used a separate vendor to prove the use of DDR2 on the AM1808 and the OMAP-L138. Although not officially recommended as the development platform of choice, and not open for order entry, we do refer customers to the schematics found here: http://support.spectrumdigital.com/boards/evmam1808/revb/ for a known good DDR2 layout. I understand there are some concerns that this board has too many layers and we are looking for something to help.

    ..............omitted.................

    Huy Pham
    DSP+ARM Business Manager
    huy@ti.com


    Q

    Posted by Winston Lee

    on 28 May 2011 9:21 PM

    • Prodigy80 Points

    Hi Huy,

    I had the same trouble with hawkboard. After I switch to LogicPD AM1808 evm, everything works fine. However, I have some questions which LogicPD does not answer. So, I was wondering if you may help.

    Here are my questions:

    1. What is the difference between OMAP-L138 and AM1808 ? I keep seeing theses two terms. Are they referring to the same thing ?

    2. LogicPD AM1808 uses DDR and Serial Flash. In our product, we plan to use SDRAM and NAND. Does TI have suggested design for such memory configuration ? Or, could you direct me to proper documents ?

    3. Also, we plan to use AM1806 + TI WiFi. Does TI have suggested design for this ? Or, could you direct me to proper documents ?

    regards,

    A

    Posted by Huy Pham

    on 31 May 2011 8:06 AM

    • Prodigy260 Points

    Hi Winston,

    (1) The AM1808 is ARM9-only and the OMAP-L138 is ARM9 + C674x DSP. They are pin for pin compatible,

    so they are excellent for scalable  designs. Since they share the same peripherials you will see them used interchangeably. 

    (2) I'll let one of my apps engineers comment on that. In general, I have seen most of my customers use DDR and flash or NAND.

    (3) I assume you are using this: http://focus.ti.com/docs/toolsw/folders/print/tmdxwl1271dc18xl1x.html ? That would be our suggested solution.

    I apologize for the late reply - holiday weekend in the states.

    Thanks

    Huy




    OMAP-L13x Marketing Manager Huy Pham is suggesting that EVMAM1808 from Spectrum Digital can be referenced for at least DDR2 layout, and the reason for this was because AM1808 and OMAP L138 are pin-to-pin compatible. I compared the DDR2 pins of these two devices from respective manuals and found they are indeed identical.


    It seems very likely that EVMAM1808's DDR2 layout can be directly copied for OMAP L138. Have you ever heard or have any experienced with this?


    And could any TI employee on the board provide some more information on this?





    Regards,

    Zheng


  • 0 in reply to Anonymous
    TI__Mastermind 27585 points

    Hi Zheng,

    Yes we definitely do not recommend basing your schematics or layout on the existing Hawkboard. The AM1808 is a known working design with freely downloadable schematic and layout files.

    Keep in mind that when copying the design you will most likely have to make some modifications to fit your own form factor and design. Make sure the DDR layout is 100% compliant with the datasheet guidelines in every case.

    Jeff

  • Anonymous
    0 Anonymous in reply to jc-ti

    jc,

    I got it, thanks for confirmation.

     

    Zheng