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Hi,
from my understandment PCIE runs in x1, x4, x8 and x16. x2 is possible but is not standard for the Slots on a mainboard.
Card PCIe x1 PCIe x4 PCIe x8 PCIe x16 x1 ok ok ok ok x4 - ok ? ? x8 - - ok ? x16 * * * ok
On the other side you can use the lanes like you want to :) if the core supports x2 this schould be no problem.
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The thing is in the PCIe compiler wizard, no x2 option is allowed. (x1, x4 and x8 only), and datasheet of Arria also specifies that x1, x4 and x8. No such x2. x2 is only in CycloneIV. I'm not sure wha't the reason behind it.
So what i tried to do was to hack/cheat the PCIe compiler.
I configure the core to be x8 but actually plug into a "x2 slot" (by masking the pins with scotch tape).
So far, nothing complains. Data is well-received.
Honored Contributor
