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Altera_Forum
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10 years ago

DDR3 Memory errors but passes Calibration

Hi We are getting intermittent memory read errors from our DDR3 SDRAM Controller with UniPHY hmc in a Cyclone V Using the EMIF toolkit we can run calibration on the memory and it passes every time...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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I'm not a DDR memory expert by a long shot, but what is your clock rate? Have you examined the integrity of the clock with a scope? Can you reduce the clock rate and see if the issue persists?

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Hi thanks for reply.

clock frequency is 300 MHz. Yes I will look with a scope but since the problem is only present after particular resets/calibrations I'd not thought of it as a possible cause of the problem. I will also try slowing down the clock as you suggest.

Thanks

Dave