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Harry123's avatar
Harry123
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10 months ago
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PLL not working on 10M16DCU324 FPGA_Quartus toll

Hi,

I have designed board with 0M16DCU324 having 25MHz eternal clock source. I am trying to test PLL by toggling LED with PLL generated clock but i am not able to toggle the LED. Once i revived schematic i found that 2 out of 4 VCCD_PLL pins on my board are not connected. earlier design i was using 10M02DCU324 here my PLL was working as this device is having only 2 PLL.

Does PLL to function need to connect all VCCD_PLL to 1.2V?

is there any way to configure specific PLL blocks which has VCCD_PLL pins connected to 1.2V?

I have VCCD_PLL1 and VCCD_PLL2 connected to 1.2V and remaining two are floating. I am suspecting that as all of my VCCD_PLL are not connected to 1.2V that's why my PLL is not working, is this understanding correct?

Thank you

Configuration

4 Replies

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    10 months ago
    Hi,
    you are starting 3 threads where you should start one.

    MAX10 pin connection guidelines are clear about necessity of connecting all PLL supply pins. "Connect VCCD_PLL[1..4] pins to 1.2-V power supply even if the PLL is not used."

    They don't tell if partial functionality can be achieved without it. You may try if any PLL is still working.
  • Harry123's avatar
    Harry123
    Icon for New Contributor rankNew Contributor
    10 months ago

    I tried with my 10M08 FPGA device and it is working there, where only VCCD_PLL1 and VCCD_PLL2 is connected to 1.2V. It might be working as there are only 2 PLL modules for 10M08 keeping NC for PLL3 and PLL4.

    I tried with my 10M16 FPGA device and it is not working there, where only VCCD_PLL1 and VCCD_PLL2 is connected to 1.2V. It might not be working as there are 4 PLL modules for 10M16 and i made NC for PLL3 and PLL4 VCC pins.

    Is my understanding correct?

  • lixy's avatar
    lixy
    Icon for Contributor rankContributor
    10 months ago

    Hi,

    ​

    As mentioned by FvM, according to the Pin Connection Guideline, you must connect all the VCCD_PLL pins 1.2V power supply. So I think your understanding is correct: you have to connect all the VCCD_PLL pins to power supply to make sure the PLL works normally on 10M16DCU324.

    ​

    By the way, it seems you were trying to migrate the 10M02 board to 10M16. By comparing the Pin-out of 10M02DCU324 and 10M16DCU324, you can see there are multiple different pins, including GND, VCC, VCCA, VCCD_PLL and some VCCIO. Please also check if these pins are correctly connected for 10M16 as well.

    ​

    10M02DC: Pin Information for the MAX® 10 10M02DC Device - XLSX Format (Alt. Format PDF)

    10M16DC: Pin Information for the MAX® 10 10M16DC Device - XLSX Format (Alt. Format PDF)

    MAX 10 PCG: MAX® 10 FPGA Device Family Pin Connection Guidelines

    ​

    Best Regards,

    Xiaoyan


  • Harry123's avatar
    Harry123
    Icon for New Contributor rankNew Contributor
    10 months ago

    Hello

    Thanks for sharing IO pin details, i have verified it and all the GND, VCC, VCCA, VCCD_PLL and VCCIO pins for 10M16DCU324 are connected as per shared details. Actually i have migrated from 10M08DCU324 to 10M16DCU324 so here both the devices have similar pins for GND, VCC, VCCA, VCCIO, only difference is VCCD_PLL2 and VCCD_PLL3 are additional pins in 10M16DCU324.