[SI-LIST] Re: DDR SDRAM signal routing

I fully agree with Mike, we gotta think beyong application notes.
Design & simulate....Sky is your limit.

Trilok

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Mike Mayer
Sent: Tuesday, November 09, 2004 1:43 AM
To: tbiggs@xxxxxxxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: DDR SDRAM signal routing


Well, to take the devil's advocate position one step further,

If I am a manager and my products have interfaces that are done "to the
app note", is my company doing "engineering"? I can hire people cheaper
than engineers that can read an app note and hook the chips together in
a schematic editor.

If you want to compete on more than cost (or cut costs by eliminating
layers, etc.) you need to push the envelope of the design (i.e.,
engineer) If you are pushing the envelope you are going beyond the app
notes, and will get into trouble if you don't simulate.

Just my opinion.

On Mon, 2004-11-08 at 12:11, Tom Biggs wrote:
> I'm going to play devil's advocate here just to get people thinking.
> (Note that I simulate the DDR designs I've done).
>=20
> Ed says "The driving force behind all this is time to market and =
system
> reliability."
>=20
> There is one other force: cost. These days we can be easily outsourced
> if we are too expensive to our bosses.=3D20
>=20
> How many IBM PowerPC 440GX (now AMCC's chip) designs have been done? =
How
> many times have people simulated them and come up with design =
guidelines
> that will work? Yes, many of these designs are different from each
> other, but I would bet that many of them are EXACTLY the same. Do we
> need 100 engineers to simulate the exact same thing 100 times to come =
up
> with 100 identical sets of routing rules?=3D20
>=20
> If AMCC ran lots of simulations, then came out with a set of strict
> routing rules for some typical embedded 440GX applications, then =
someone
> should be able to design a board with these rules and not have to run
> simulations. Reliability should be fine if they do their job right, =
time
> to market will be short, and cost will be low.

>     -tom

--=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Mike Mayer
mwmayer@xxxxxxx


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