[SI-LIST] Re: Package Model in IBIS
- From: Newbie Pugal <pugal8686@xxxxxxxx>
- To: Russell Dill <Russ.Dill@xxxxxxx>, "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- Date: Mon, 27 Jun 2011 23:08:07 +0530 (IST)
Hi All,
Thanks for the replies.
As far as I understand the RLC values specifies in the package model provides
the wirebond or flipchip package parasitics right? or else it is a
characteristics of a pin?
Looks like a basic question but worth clearing the doubt.
Thanks
Pugal
________________________________
From: Russell Dill <Russ.Dill@xxxxxxx>
To: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
Cc: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Sent: Monday, 27 June 2011 10:26 PM
Subject: [SI-LIST] Re: Package Model in IBIS
If the package is sufficiently large, it would seem like the delay
could make a difference, especially if the impedance of the package
differs greatly from the impedance of the PCB trace.
On Mon, Jun 27, 2011 at 9:09 AM, Muranyi, Arpad
<Arpad_Muranyi@xxxxxxxxxx> wrote:
> That's because the rule is to give the length
> in the same unit as the RLC per unit length.
> If you multiply these two, the length drops out,
> so for the simulator it really doesn't matter.
> Arpad
> ==================================================
>
> -----Original Message-----
> From: Russell Dill [mailto:Russ.Dill@xxxxxxx]
> Sent: Monday, June 27, 2011 11:08 AM
> To: Muranyi, Arpad
> Cc: si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: Package Model in IBIS
>
>> The first two methods only support RLC data, there is no
>> length in this data. The RLC matrix is also without length.
>> The only syntax that can provide length is the multi-segment
>> uncoupled syntax, but even with this one, if length is 0,
>> the tool has to implement the RLC data as a lumped model.
>>
>> I hope this helps,
>
> BTW, I noticed that the IBIS specification specifies that "Lengths are
> given in terms of arbitrary 'units'." Any clue what the logic is to
> providing a length, but not actually giving it meaning? Is it just
> save the maker of an IBIS file from multiplying LRC per unit length by
> length?
> ------------------------------------------------------------------
> 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:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> 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:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
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:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts: