On Oct 23, 4:04 pm, CBFalconer <cbfalco...@yahoo.com> wrote:
> Since the only purpose of the refresh circuitry is to avoid the
> memory dropping bits, it should already be running at the slowest
> possible rate, and speed reduction will be harmful, while speed
> increase will do no good. So this is not a good idea.

I disagree (softly), having designed several memory controllers, I
always found it easier to just insert a READ DATA command into the
DRAM when a refresh was needed, rather than insert a refresh command.
The timing differences between refresh and a loosly coupled string of
READS is such that one can refresh ahead with READs easier and then be
in a position to absorb a longer string of demand requests by not
using the REFRESH commands. Thus while running at the slowest overall
rate, one can bunch and distribute the refresh mechanics to better
interleave same with the demand memory requests and gain something.

But I will state the overall performance differences are a fraction of
the refresh overhead anyways.

> What are you trying to do?

That is the real question.