Reduce the DDR clock below 300 MHz

[Moti]

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

[sstrell]

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 · Accepted solution]

HI,

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

Thanks.

Regards,

dlim

[Deshi_Intel]

You are welcome !