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AM3715 EVM SDRAM

Rodolfo Solera
Prodigy 110 points
Other Parts Discussed in Thread: TPS65950, AM3715

Hi all

I have a Mistral AM37xx EVM that comes with a 26MHz clock and 256MB of LPDDR RAM. On a custom built board that is pretty much like the EVM, I will have a 13 MHz crystal instead of a 26MHz and I was wondering if that would affect the RAM. I found a function in xloader that apparently detects the frequency of the clock and sets a register with this value, but I cant be sure that RAM will work just fine. I did try to change the frequency on the Mistral EVM to see if RAM was affected, but I was not able to find a way to do so.

Anybody could help me with this?

Thanks

RS

  • 0
    TI__Expert 8180 points

    I am not quite sure what is the reason behind suspecting functionality of RAM on input freq change? I am not HW expert, but I remember I had worked with few customers and helped them to get 13MHz input working on their boards.

    I don't quite remember all details now, but there were some issues with 512Mb RAM on BeagleboardXM; but on EVM we have never seen any issues.

    Thanks,

    Vaibhav

  • 0 in reply to Vaibhav Hiremath
    TI__Genius 15510 points

    I'm not a hardware expert either, but 13MHz shouldn't cause any problems with RAM. The 13MHz clock source gets multiplied and divided to generate the core clock. Then the core clock is divided by two to generate the L3 clock. As long as these multipliers and dividers are correct in x-load/u-boot, that 13MHz source will eventually generate the 166MHz or 200MHz you need for RAM.

    One note though, the PMIC on the EVM (TPS65950) only supports clock speeds greater than or equal to 19.2MHz.

    Steve K.

  • 0 in reply to Vaibhav Hiremath
    Expert 1330 points

    Hi Vaibhav,

    In our customized design we are using  AM3715 with supported features. I am planning to interface these features to AM3715.

    • DDR Memory - 512MB
    • NAND Flash   - 512MB
    • NOR Flash      - 8 GB or ???
    • DISPLAY         - 1024 X 600 pixel TFT LCD
    • SDCARD        - 8/32 GB
    • GPS                -  UART
    • GSM/GPRS    -  UART
    • Bluetooth       -   UART
    • Wi-Fi                -  UART
    • Printer              - UART
    • Camera           - USB

    Please let ,me know, if there is any limit on my design.

    Regards,

    Francis