[SI-LIST] Re: Question on SI measurement/validation without receiveraccess
- From: zhangkun 29902 <zhang_kun@xxxxxxxxxx>
- To: arsenault_brian@xxxxxxx
- Date: Wed, 29 Sep 2004 23:09:09 +0800
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
>
>
>
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