I am testing Arria 10 GX with transceivers speed grade 3, and have enabled in native phy standard pcs(8b/10b decorer and encoder and word aligner).
Does pcs downgrade speed of my Transceivers? In device datasheet I did not find information about it. In Stratix V daasheet this thing was described.
And what is difference in chip to chip and backplane? For example I have board with sfp modules? Is this backplane or not?
PCS speedgrade is tied to transceiver speedgrade as PCS is part of transceiver channel design block.
For chip to chip :
For backplane :
I am not sure how your QSFP module connect to the other end destination of your system setup but I hope my explanation is clear to you.