Re: DDR / DDR2 memory controllers

From: Hans-Bernhard Broeker (broeker_at_physik.rwth-aachen.de)
Date: 06/24/04 

Date: 24 Jun 2004 11:24:30 GMT

Richard <rh86@azglobal.com> wrote:

> The question pops up occasionally about using SIMMs or DIMMs with
> embedded systems. Generally, the consensus is "don't do it" - but why?

Because you almost certainly don't want all the pains and effort it
takes to build your own full-featured SDRAM memory controller. Even
less so for DDR stuff. It usually takes PC chipset manufacturers that
have a *ton* of experience with this particular job on the order of a
full year's worth of hardware design and BIOS coding work to get that
right --- are you sure you're up to that kind of project?

> I've seen comments about the variety of modes, but don't memory
> controllers handle this?

They do. But the way you describe your plan, you'ld be doing that
memory controller on your own. 

-- 
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.