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NGord's avatar
NGord
Icon for Occasional Contributor rankOccasional Contributor
2 years ago
Solved

altera_mem_if_ddr3_emif

Hi


altera_mem_if_ddr3_emif used to have a parameter box 'enable afi half rate clock' in Quartus 18

Somewhere between V18 and V23 it has disappeared and I cant get afi_half_clk to work any more.


How do I enable afi_half_clk in V23?

4 Replies

  • NGord's avatar
    NGord
    Icon for Occasional Contributor rankOccasional Contributor

    If opening Platform designer with no Project selected , I see the 'half-rate' tick box in DDR3 SDRAM Controller with UniPHY Intel FPGA IP, regardless of Quartus version.
    If the project is for a MAX10, the tick box disappears and I have no afi_half_clk.
    I can find no explanation for this.

  • NGord's avatar
    NGord
    Icon for Occasional Contributor rankOccasional Contributor

    Is the issue that the MAX10 PLL doesnt have enough PLL outputs?

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor

    Hi NGord,


    For Max 10 FPGA device, the DDR3 EMIF IP doesn't support afi half rate clk.

    I think the Cyclone V device is used by default if no project is opened.

    Therefore, the DDR3 EMIF IP is targeting to Cyclone V and you may see the afi half rate clock option.


    Regards,

    Adzim