Forum Discussion

Moti's avatar
Moti
Icon for New Contributor rankNew Contributor
5 years ago
Solved

Reduce the DDR clock below 300 MHz

Hi

I use Quartus 20.3 pro for Stratix10 FPGA, DDR3 1600.

need to config clock below 300MHz at the IP.

at the DDR datasheet I found that I can run it slower.

I have attached the error I received, is it possible to configure the IP to support slower clock?

Thanks.

Moti

  • Deshi_Intel's avatar
    Deshi_Intel
    5 years ago

    HI,


    Yup, as you can see from your own error screenshot, it's not supported.


    Thanks.


    Regards,

    dlim


3 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    Are you saying you want to drive the external memory at a lower speed or run the internal logic at a lower speed? The internal logic runs, based on your current setting, at 1/4 the speed (quarter rate mode) of the external memory clock. If you're saying you want to run the external memory at a lower speed, then you can't, as the message indicates.

  • Deshi_Intel's avatar
    Deshi_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    HI,


    Yup, as you can see from your own error screenshot, it's not supported.


    Thanks.


    Regards,

    dlim