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Altera_Forum's avatar
Altera_Forum
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16 years ago

Why all the pins but for power provider are low level after power on the EP3C10 ?

Hi,

I just layout a PCB board for EP3C10E144N8,but after power on(3.3v-->Vccio,2.5v-->Vccai and 1.2v-->Vccint) the device,all pins but for power provider are low level(include pull-uped CONFIG_DONE,nCONFIG,nCE,nCSO). JTAG can not detect any device.

At the power on status,any IO pins has about 200~900 ohm resistance to GND.

So what causes this problem?

Is my EP3C10E144 damanged?

Can anyone help me?

Thanks.

Rgds.

Eric xia

:confused:

1 Reply

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

    Your schematic doesn't show the ground connection of EP3C enhanced pad ("Pin145"). Did you connect it anyway?