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Altera_Forum
Honored Contributor
18 years agoDPA Word Alignment
I'm working on a Stratix III design using DPA on links between FPGAs on the same board. My question is: is it really necessary to have to dynamically train each channel to achieve word alignment? i...
Altera_Forum
Honored Contributor
18 years agoNo, it's not that fast but if I stick with a SERDES/DPA approach I always have the option of pushing things faster later on.
What I have discovered is that bit 6 (msb) on the Tx side comes out in bit 3 on the Rx side which happens to be the middle bit of the 7. Can this be explained? As far as I can tell from the Stratix III documentation this is what should happen Tx clock/data: /^^^^^^^^^\____________/^^^^^^^^\_____________/ <6><5><4><3><2><1><0><6><5><4><3><2><1><0> Rx data: <...............6543210............><...............6543210............> I'm getting: Tx clock/data: /^^^^^^^^^\____________/^^^^^^^^\_____________/ <6><5><4><3><2><1><0><6><5><4><3><2><1><0> Rx data: <................2106543............><................2106543............>