Calibration failing for DDR2 Memory Controller on Cyclone V

dlim,

Thanks for the confirmation. I omitted this resistor in the initial design but have had our techs try to add it to the board. Its possible that the wiring wasn't quite done right - what kind of failure would you expect without this termination resistor connected to GND?

Also, does changing the current setting for each of the pins alter the termination resistance? I know the default example design sets the memory interface to MAXIMUM CURRENT, but would changing this setting improve the match to the memory device?

Thanks!