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NGagl's avatar
NGagl
Icon for New Contributor rankNew Contributor
7 years ago

Calibration failing for DDR2 Memory Controller on Cyclone V

I'm having trouble implementing the example project generated when instantiating a DDR2 interace on a Cyclone V device on a custom board. At this point, I am trying to create a soft memory interface...
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
7 years ago

Rzq is the termination resistor reference used for IO standard calibration. Wrong termination resistor will end up with wrong calibration result and hence hurt the signal quality potentially leading to DDR2 write/read failure.

Current setting is used to tuned the signal quality as well. You need to run board simulation to find the optimize setting that suit your board design. Else you can just stick with the default setting for now.

Thanks.

Regards,

Deshi