[SI-LIST] Re: Multi Board Simulation with DIMM Board from Micron Tech

From: tcrondeau <tcrondeau@xxxxxxxxxx>
To: "'sudheerbs@xxxxxxxxxxxxxx'" <sudheerbs@xxxxxxxxxxxxxx>,si-list@xxxxxxxxxxxxx
Date: Fri, 25 Oct 2002 10:48:53 -0600
Sudheer,

I am the engineer at Micron who generates these models and supports
customers with problems and questions like these. 

First, the model you have was generated from a routed board. The numbers you
see in the model are correct. Now when you created a "system" for
simulations SQ writes a board file with the same name as the board model in
your working directory. This new board file is unrouted and has odd looking
symbols that really have no use to the user. But when you go to extract the
net of interest into Sigxp the extraction process uses that board file as a
reference and this is where you get the odd numbers and unrouted traces. I
think the values you get are manhattan distances between the driver/receiver
pin pairs. That is why they look so long. So at present time you can't
extract nets from board models.

If you need to extract that data out there is a method I have not memorized
and can't give details on at this time but is possible. Another possibility
is to contact your Micron sales person or field engineer and work on getting
an NDA in place. After the NDA is signed I can send you the actual board
file for use in simulation and you can extract all the nets you want. 

Regards,

Tom Rondeau
Micron Technology Inc.


-----Original Message-----
From: SUDHEER [mailto:sudheerbs@xxxxxxxxxxxxxx]
Sent: Friday, October 25, 2002 9:57 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Multi Board Simultion with DIMM Board from Micron
Tech


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Hi SI experts

I am doing MultiBoard Signal Integrity Analysis with the Memory DIMM
Board  provided by Micron Technology . I am Using Specctraquest SI
Expert 

I have connected the Board Model/Board file  to  the main board 
through DESIGN LINK .I have connected my connector to the particular
component having same pinnumbers in the board file 
When i opened the Signals connecting  these two boardsin signal
Explorer ,i can see the interconnect data between elements inside the
Board file(DIMM) are in the order of 10's of inches  which is 
not correct (in the .ebd files their length is around 600 mils) . 
I have continued the  simulation by changing the interconnect length
acc to .ebd file 
I was not able generate reports in Batch for the signals coming in
between these two

My quection is Does anyone have done simulation in SpecctraQuest SI
Expert by including this DIMM Memory Board , is so what are the
procedure to be followed to get the proper interconnect data within
the dimm boardfile ?

Does the board file provided by the Vendor is routed one ? i can see
in the signal explorer as unrouted. pcb traces and impedance values of
those traces were the default impedance in the simulator   



Is there anyway to attach the .ebd  model to the DimmBoard connector
in Specctraquest Si expert ?

Thanks 

SUDHEER 

sudheer@xxxxxxxxxxxx


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[SI-LIST] Re: Multi Board Simulation with DIMM Board from Micron Tech

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