It is possible to use a SDRAM with lower frequency that its nominal frequency?
I'm using a SDRAM that have nominal frequency at 143 or 166MHZ, can I use this SDRAM with 80MHz clock?

 

You can if you can meet the refresh requirements.

 

Yes, I imagined it could be a problem with refreshment times. I'm driving my SDRAM with an FPGA and I have a specific FSM to do so which also includes the parameterization of the refresh times. Having a lower clock I think you have to increase the refresh rate, do it more times than what is established by the nominal data. Is my reasoning correct?

 

Yes, I imagined it could be a problem with refreshment times. I'm driving my SDRAM with an FPGA and I have a specific FSM to do so which also includes the parameterization of the refresh times. Having a lower clock I think you have to increase the refresh rate, do it more times than what is established by the nominal data. Is my reasoning correct?

IIRC there is a maximum time between refresh cycles. We never pushed up against that limit very hard. We did have smaller chips by at least several orders of magnitude.