Forum Discussion

alinave's avatar
alinave
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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
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6 years ago

Hi I think you should use the 3200 datasheet. for some specific parameter that need to derive from memory clock, then you have to calculate it based on the actual frequency that you use which is 2400. (1200MHz)

  • alinave's avatar
    alinave
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    6 years ago

    Hi BoonT_Intel and sstrell,

    Thanks for your reply. I will be using using the speed grade of the device in the timing information in the "Parameters dependent on Speed Bin" section of the "Mem Timing" tab of the EMIF IP. Also, for the "Parameters dependednt on Speed Bin, Operating Frequency, and Page size", I would be using the parameters depending on the operating frequency and the page size of the device used.

    However, I am still not sure about the "Latency and Burst" section in "Memory" tab of the EMIF IP. I want to write the correct "Memory CAS latency setting" and "Memory write CAS latency setting". I need to dig in more into the details... please let me know your thoughts on that.

    -Naved