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Altera_Forum's avatar
Altera_Forum
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12 years ago

Full rate PHY selection

I need to generate a DDR3 PHY in Full rate mode for a Cyclone V part. I am using Quartus 13. I select "memory clock frequency:" different numbers like 400, 125, 200MHz. I see only half rate mode can be selected on "Rate on Avalon-MM interface". I need to select Full rate mode. Please advise.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Hi,

    First enable HARD_EMIF: (Hard Memory IF Controller)

    Then you can select full mode (related to the datawith - x4, x8 etc).

    See Altera SoC Handbook for details.

    regards,

    V.ZS.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Thanks for the reply!

    It helped me to generate full rate PHY.

    One more thing: this option is only available if user wants to genearte both controller and PHY. I want to select the option "generate PHY only". I just generated both of them and going to remove the controller only. It is an option but I don't get why the GUI is like this!
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    you can only select Full Rate when using the Hard External Memory Interface (which includes PHY and controller). the fabric would not be able to close timing for a full rate controller, so they do not give you the option