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Altera_Forum's avatar
Altera_Forum
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12 years ago

ARRIA V 1.1VCC issue

Hi,

I have designed a new board for my company based on a 5AGXMB1G4F31C4N.

When I received the board, I checked isolations between all the power line and GND. I got a 35Ohm isolation between VCC 1.1V and GND.

I'm looking for what appened : power pins connexion seems to be OK.

Could you please help me ?

Despite those problem, I managed to configure the FPGA NIOS2 + Uniphy DDR3 + JTAG + EPCS + FLASH running uClinux

Thanks in advance.

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    It doesn't sound like you have a problem. If you can configure the FPGA and perform the tasks you've stated then a lot is working properly.

    35Ω is a perfectly reasonable DC resistance to measure between VCCINT and GND on an assembled board. What were you expecting?

    A quick check on some boards I have around me reveals DC resistances as low as 20Ω between VCCINT and GND. They all work as expected.

    Cheers,

    Alex