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PCI+Nios problem with Cyclone III device

Altera_Forum
Honored Contributor II
‎02-05-2009 08:31 AM
1,074 Views

Hi, 

I think I have posted this question in a not related section. I will repeat it here in more detail: 

I am designing a peripheral card which interfaces PCI bus. My board is using a Cyclone III chip (EP3C25Q240C8) which is configured to hold a simple system consisting the PCI compiler core from Altera and a Nios II processor. 

When I configure the chip - before the host PC is restarted and the card's driver is installed - I can run a simple "Hello World" application on the Nios without any problem. As soon as the card is detected by the host PC, the Nios II IDE fails to program/run the application on the processor. 

I have tested the PCI card from the host PC by reading/writing to it's address space and it seems that the PCI core is working. 

I have accidentaly decresed the VCCIO of the Cyclone III IO banks from 3.0v to a value around 2.65v and strangely Nios started working (at least with my simple hello world program). But, I know there is something wrong with this! 

Any idea what may have caused the problem? 

 

Thanks.
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