[SI-LIST] Re: Question on SI measurement/validation without receiveraccess

Brian

For a transmission line, there should be two equations to solve the 
transmission line. In signal integrity, it is problem of 1-dimension which 
composed of transmission line.

If you could not access the receiver and want to check the simulation, I guess 
voltage at two point should be compared between simulation and measurement.

It is only my guess. I hope this is helpful.

Best Regards

Zhangkun
2004.9.29

----- Original Message -----
From: "arsenault, brian" <arsenault_brian@xxxxxxx>
Date: Wednesday, September 29, 2004 11:01 pm
Subject: [SI-LIST] Question on SI measurement/validation without receiver       
access

> Folks...
> 
> I'm looking for some suggestions and ideas on how to perform SI 
> measurementsand correlate them to simulations when you don't have 
> access to the receiver
> pin.
> 
> For example, one of our designs is looking at back-to-back 
> mounting of DDR-2
> memory chips, and based on the spacing of the board, the vias 
> close to the
> receivers (the RAM's, when a read operation takes place) will not be
> accessible.  The same thing would apply to probing signals at a 
> receiverthat is using blind and buried vias.
> 
> Traditionally, all of our technology has utilized only through-
> vias, and we
> have been able to probe directly on the pins of the receivers if a 
> via was
> not located very close by.  As we're moving forward, it's apparent 
> that we
> need to find a better way to both show the designer that his/her 
> design will
> work, and for the SI group to correlate their simulations to 
> measurements.
> I'm aware that building a test card to validate the buffers is one 
> way to
> go, but in these times, we are trying to minimize extra costs.
> 
> Thanks...
> 
> Brian
> 
> 
> Brian Arsenault
> Principal HW Engineer
> EMC Corporation
> Hopkinton, MA
> 
> 
> 
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> 
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
> 
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> 
> List FAQ wiki page is located at:
>                http://si-list.org/wiki/wiki.pl?Si-List_FAQ
> 
> List technical documents are available at:
>                http://www.si-list.org
> 
> List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>  
> 
> 

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: