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HungLam's avatar
HungLam
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6 years ago

AN829 - PCIE AVMM DMA for external memory - Failed when change from DDR4 to DDR3 protocol

Hi,

I refered to AN829 to make the change of EMIF from DDR4 to DDR3. I have adapted the same. And finally, there are several errors, but I am not able to locate where to fix them.

"Error(19179): The EMIF interface has an input connection from the core (top_hw|mm_interconnect_0|agent_pipeline|gen_inst[4].core|data1[5]) that does not connect to a pin. Please review the top-level design to make sure all memory interface signals are connected to the top-level"

You please let me know how to fix these errors. Or where to find the cause of these errors.

Thanks a lot!

3 Replies

  • BoonT_Intel's avatar
    BoonT_Intel
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    Hi Sir,

    check from the RTL, the signal top_hw|mm_interconnect_0|agent_pipeline|gen_inst[4].core|data1[5] connect to what signal. I guess it is now floating at higher level. This signal need to connect to certain signal or logic.

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

    Thanks a lot for your answer. I reviewed RTL, but could not figure out the issue, as core.data1[5] is not floating. But I was able to fix it, by checking EMIF interface again, then found some pin was only for DDR4, not DDR3. After removing them, I passed these errors.

  • BoonT_Intel's avatar
    BoonT_Intel
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    Glad to know it is solve now. Yes, the pin for DDR4 and DDR3 is incompatible. You need some modification to the RTL when migrate the IP protocol.

    Cheers!