[SI-LIST] Re: Re : maybe something wrong in ebd definition?
- From: "Scott McMorrow" <scott@xxxxxxxxxxxxx>
- To: jonpowell@xxxxxxxxxxxx
- Date: Mon, 22 Sep 2003 09:31:01 -0700
For a Len=0 ebd section, I would suggest modeling the L and C as a pi
circuit, because of it's symmetry. I believe this is what most IBIS
simulators do. If a specific directionality is required two seperate
sections can be provided in the model. For example, for an L followed by
a C:
Node A
Len=0 L=2
Len=0 C=1
Node B
regards,
scott
p.s. - for quick access to all things IBIS, we've provided the following
page on our website for the engineering community, which Bob Ross keeps
updated on a regular basis.
http://www.teraspeed.com/ibis_resources.html
--
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
Jon Powell wrote:
>I think you are right. There is not enough information. Ideally if this is
>supposed to be a distributed transmission line it would be defined in terms
>of Z S and Length. With L C and length you can translate to Z S and length
>and then you would not have the lumped problem.
>If this was really supposed to be discrete L and C elements there should
>have been more nodes defined to give order.
>
>regards,
>jon
>
>(ps: Len=0 is rather suspicious at any rate, that being impossible in a real
>world situation).
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On
>Behalf Of cat
>Sent: Monday, September 22, 2003 4:37 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re : maybe something wrong in ebd defination?
>
>
> Oh, I am really eager to know the answer.And if you are not sure,I still
>hope you can communicate with me.If there is something wrong totally,please
>let me know.
>
>resend the message:
>
> I think the description of [path description]section of the ebd file is
>not detailed enough.I got confused when I meet such condition:
>Node A
>Len=0 L=2 C=1
>Node B
>
>Should I represent it like this:
>
>
> B <---@@@@@----------|--------------->A
> L=1 |
> |
> === C=1
> |
> ---
>or like this:
>
>
> B <-------|------------@@@@@------------>A
> | L
> |
> |
> =====C
> |
> ---
>By the way,should the capacitor be connected to ground or power? How to
>determine this ?
>In fact , I found many cases like the above one in the DIMM ebd file
>supplied by molex.
>Maybe both representation is just the same? Or there is some description I
>did not noticed?Or this is really a oversight?
>any response will be appreciated.
> cat
> cat_carl@xxxxxxxxx
> 2003-09-19
>
> With best regards
>
>
>
>
>
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