Forum Discussion

alinave's avatar
alinave
Icon for New Contributor rankNew Contributor
6 years ago

Which Memory Timing information should be used in DDR4 EMIF IP for Stratix 10 if using a higher speed grade memory device at a lower speed - the higher speed grade or the lower speed grade?

Hi, I am setting up the DDR4 controller IP for a device which has a speed bin of 3200 MT/s. However, I would be using that device only for 2400 MT/s. While entering the timing parameters from the de...
BoonT_Intel's avatar
BoonT_Intel
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Hi Naved,

Are you able to find the "Memory CAS latency setting" and "Memory write CAS latency setting" in the device datasheet? to be accurate, you need to get these value from memory vendor. Otherwise, you can select the preset (at right bottom corner) that nearest to the device that you using and apply it to get the recommended setting.

  • alinave's avatar
    alinave
    Icon for New Contributor rankNew Contributor
    6 years ago

    Hi BoonT_Intel,

    Yes. I can get these settings fromt he memory vendor. However, I see different settings "Memory CAS latency" and "Memory write CAS latency" depending on different speed bins. If the device is of 3200 speed bin but we are operating it at 2400 speed bin, then which of values should I enter while configuring the IP CAS values for 2400 or for 3200?

    Thanks,

    Naved