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Altera_Forum's avatar
Altera_Forum
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9 years ago

PCIe IO BAR's limited to "Legacy Endpoints"

I am looking to define an EP with a BAR defined as IO instead of memory inorder to test the IO / CNFG PCI ordering rules . I thought it would be as easy as going into an existing design and r...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

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IO style endpoints aren't really supported in PCIe. They only exist so that legacy PCI cards can be attached via a PCIe to PCI bridge. I wouldn't be at all surprised to find out they don't work. I wouldn't be upset about it either. It's basically legacy garbage that should be ignored in a modern design.

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Thanks Galfonz.

I'm not particularly interested in IO and understand the point you make but I am interested in testing ordering rules for IO and Configuration Writes / Reads per the specified rules since IO and Configuration are handled differently ... Since IO and Configuration are treated the same with respect to ordering , I thought IO would be easier to implement.

If it is't easy to implement with the hard PCIe IP I have access to ... then I will look to the Keysight and LeCroy Exerciser cards that I have access to.