Re: [SI-LIST] : A simple topology

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From: Vinu Arumugham (vinu@cisco.com)
Date: Mon Jul 31 2000 - 09:27:33 PDT


Kent.Zhang@smartm.com wrote:

> Let's take a net with one driver and two
> identical receivers and analyze a simple topology.
>
> Driver to T-point = L0
> T-point to both receivers = L1
> Total length from Driver to receiver L = L0 + L1
>
> Case 1, L0 = 5.00", L1 = 1.00", L= 6.00"
> Case 2, L1 = 1.00", L2 = 5.00", L= 6.00"
>

Assuming you meant:
Case 2, L0 = 1.00", L1 = 5.00", L= 6.00",

Case 1 is better if ZL0 = ZL1=Rs (source impedance)

Case 1 is the same as Case 2 if ZL0=Rs and ZL0=0.5 ZL1.

>
> Question:
>
> Is Case 1 ALWAYS better than Case 2 ? If not,
> under what conditions? Variables can be types of
> drivers and receivers, frequency, trace impedance,
> stackup etc.
>
> Kent Zhang
> SMART Modular Technologies
>
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