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IOzan's avatar
IOzan
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Unable to fill up the SDRAM memory

Hi, I'm working on the DE2-115 EVM and I'm trying to operate the SDRAM through NIOS II soft processor ("e" ver). In my code, I fill the memory with the "i" number- while increasing the case address...
NurAida_A_Intel's avatar
NurAida_A_Intel
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Hi IOzan,

Thank you for joining this Intel Community.

May I know what is your SDRAM width?

Let's say if your SDRAM width is 8 bits, then your offset will be +4. If the width is equal to 16 bits, then the offset will be +2.

Also, to perform read/write to memory, using "IOWR/IORD" signal is the best way. I recommend you to use this way and change the offset.

If this doesn't help, please send us the design for debugging purpose

Thanks

Regards,

NAli1

IOzan's avatar
IOzan
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Hi,

I'm sorry but after following the exact tutorial instructions as well as your suggestions (in the previous email), the SDRAM is still only partially working (works well up to first ~144 cycles).

My On my DE2-115 EVM I have two 64MB (128M (32x32)) SDRAMs from the model of IS42S16320B.

I don't really know how to move forward with this problem... L.

I'm attached the complete project for you to have a quick look of the configuration (If you can…).

Thank you very very much…

Idan

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

    Dear IOzan,

    Just to let you know that we are still looking into your issue. I will keep you updated from time to time. Thank you very much for you patience.

    Regards,

    NAli1