Description The following error message in Quartus II is correct. There is a limitation of 622 Mbps for Stratix II devices in Quartus II software. You will receive the following error:
"Error: Can't place SERDES receiver or transmitter xxxxxx with xxx Mbps data rate in location R28 -- location supports only 622 Mbps data rate"
Some LVDS channels do have a limitation to 622Mbps due to a trace-length mismatch.
Stratix II Handbook will cover this limitation in a future version of the documentation.