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ARRIA V 1.1VCC issue

Altera_Forum
Honored Contributor II
‎01-07-2014 09:54 AM
1,045 Views

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.
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Altera_Forum
Honored Contributor II
‎01-07-2014 02:12 PM
313 Views

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
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Altera_Forum
Honored Contributor II
‎01-07-2014 03:21 PM
313 Views

Thank you... 

I was expecting values like Mega Ohms...
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