Forum Discussion

Moti's avatar
Moti
Icon for New Contributor rankNew Contributor
4 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 rece...
  • Deshi_Intel's avatar
    Deshi_Intel
    4 years ago

    HI,


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


    Thanks.


    Regards,

    dlim


sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
4 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.