FreeLists / si-list / [SI-LIST] Re: DDR SDRAM signal routing

["giancarlo guida" <gguida@xxxxxxxxxx>]

Hi Hal and others,
I read this interesting post
and I believe there is a very interesting basic question behind the topic

At the end of the day it seems we are in fornt of the doubt
should one follow the Appnote  and/or guideline
or make simulations?

I have no doubt that the Appnote and guideline
can be very accurate and give good suggestion
but every PCB is a unique "world"
where the suggestion you got from Appnote could work perfectly
but could also fails.

A golden rule cannot be golden enough to not be verified in your real PCB
... to make such a verification, I would say that a good simulator is the
ultimate solution.

Along others advantages, a direct usage of a simulator will allow to gain
deep knowledge of your application
and short the design cycle by an unexpected ratio.

It has been demonstrated the ROI of a good simulator is practically
"infinite"

Giancarlo


----- Original Message -----
From: "Hal Murray" <hmurray@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Cc: "Hal Murray" <hmurray@xxxxxxxxxxxxxxx>
Sent: Wednesday, November 10, 2004 5:46 AM
Subject: [SI-LIST] Re: DDR SDRAM signal routing


> So to answer Peter Miller's original question, convince your boss that
> you'll probably save money and time in the long run if you are allowed
> to do simulations ...

How much does it cost for a consultant to do the simulations?  (and/or
sanity
check)

I assume the answer is "It depends", but some rough estimates and/or
considerations might be helpful.

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