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mfortuna
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7 days ago

DDR4 Problem Migrating from Arria 10 016 to 048

We have a board design that supports an F29 package Arria 10. It has two DDR4 interfaces running at an 1866 data rate. In the past an 016 chip with DDR4-2400 ICs worked fine. We needed more logic s...
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mfortuna's avatar
mfortuna
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2 days ago

I built the example design and it fails the same way. If I enable address/command leveling EMIF toolkit hangs. If I disable address/command leveling, the toolkit reports write-per-bit deskew failed. 

The 016 based board works fine.

Another datapoint is the 048 works fine except for DDR4. The design has PCIe Gen3 x 8 and four 12.5G transceivers. The boards were designed with the upgrade from 016 to 048 in mind.

I did see another user had intermittent errors with an Arria 10 and DDR4-3200. But they were able to calibrate.

Address command leveling is pretty basic. write-per-bit deskew may be a red herring.