[SI-LIST] Re: Lumped Interconnect Modelling
- From: "Dima Smolyansky" <Dima.Smolyansky@xxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 6 Aug 2003 09:11:38 -0700
Thanks, Paul, you are correct: Td must be much shorter than the rise time
for the lumped element to be valid, of course. The rest of my reasoning
still applies.
-Dima
----- Original Message -----
From: <pikeda@xxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, August 05, 2003 8:39 PM
Subject: [SI-LIST] Re: Lumped Interconnect Modelling
>
> Hi Stradlin,
>
> You are right in that the Td < Tr/10 is the rule that Dima probably meant
> to say but I think you are still confused by the reason why. I think Bart
> got it right. To put it simply, the longer the trace, the longer the
delay,
> and the farther out in time the ringing in the signal will occur and the
> less setup and hold time you will have. Also the more the impedance
> mismatch, the higher the amplitude of the noise and the more reflections
> before it dampens out. That is why the rule is subjective. If you have a
> driver, trace, and receiver that is pretty close in impedance you can
> loosen up on the rule to 1/6Tr or even 1/2Tr. If your driver impedance is
> low and the trace impedance is high you may use 1/15 Tr. It is just a
> matter of how bad the noise is by the time you look at the signal.
>
> Paul
>
>
>
>
> Stradlin Donald <stradlin_03@xxxxxxxxx>@freelists.org on 08/05/2003
> 05:42:13 PM
>
> Please respond to si-list@xxxxxxxxxxxxx
>
> Sent by: si-list-bounce@xxxxxxxxxxxxx
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>
> To: si-list@xxxxxxxxxxxxx
> cc:
>
> Subject: [SI-LIST] Lumped Interconnect Modelling
>
> Hi:
>
> May be what you mean is : Even Tr/10 >> Td and so, eventually when the
> whole of Tr happens, it is equivalent to traversing the interconnect
length
> 10 times. This is the most conservative approach. May be the equation
> mis-guided me.
>
> If there is anything that I am not understanding properly, kindly do
> correct it.
>
> Thanks,
> Strad.
>
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