Forum Discussion

sgr's avatar
sgr
Icon for New Contributor rankNew Contributor
3 years ago

FPGA DDR interface (EMIF IP)

Hi all,

We have 8GB of FPGA DDR memory space, and i want to access full 8 GB of DDR memory space.

I have tried with one EMIF IP and i was able to access the DDR memory space up to 4GB

Question 1
Since we have 8 GB of DDR memory space can we use 2 EMIF IP to access the whole 8 GB, is there any limitation for that ?

Question 2
If we use 2 EMIF IP each of 2 GB, we are able to access only 2GB, entire 4GB is not accessible. Is there any inputs from your side to use 2 EMIF IP ?

Please provide some inputs from your side.

Thankyou all

2 Replies

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hello!


    I need some other information for checking your DDR interface.

    Please provide the information of the following:

    1. Which Quartus version and OS environment that you used?
    2. Which device OPN that you used in the your design?
    3. What is the memory spec that you have?
    4. Can you share the memory device datasheet here?
    5. Can you take some snapshots of the EMIF IP setting GUI?


    Question 1

    Since we have 8 GB of DDR memory space can we use 2 EMIF IP to access the whole 8 GB, is there any limitation for that ?

    • 2 EMIF IP to access 1 memory device may not be possible unless the memory and device are support it. You can provide the information that I've requested as above for checking the features available.


    Question 2

    If we use 2 EMIF IP each of 2 GB, we are able to access only 2GB, entire 4GB is not accessible. Is there any inputs from your side to use 2 EMIF IP ?

    • I will come back to this question after getting the information of the memory and device.


    Thanks!

    Regards,

    Adzim


  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    As we do not receive any response from you on the previous reply that we have provided, I now transition this thread to community support. Please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.