RE: [IBIS] RE: [IBIS-Users] Fork-Endfork in IBIS EBD Models

From: <mhaque_at_.....>
Date: Mon Jan 02 2006 - 10:16:20 PST
Hi Tom,
Thanks for the information. I have tried with a prototype file and it
passes the IBISCHK. The problem is that the description does not show
any specific example for the multiple fork-end fork statement and I am
not sure if the format of the path description is being interpreted
correctly. For example if "Node" in the ebd file if used outside the
fork statement it will still pass the IBISCHK parser without generating
any warning due to floating node. I am trying to confirm if I use
multiple fork and endfork statements the data will interpreted correctly
by the EDA simulator or if I have to use a different format for example
a dummy series section between every fork endfork statements to make it
working properly. 

Best Regards
Moshiul Haque
Micron Technology Inc.

-----Original Message-----
From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Tom
Dagostino
Sent: Friday, December 30, 2005 2:51 PM
To: mhaque; ibis-users@eda.org; ibis@eda.org
Subject: [IBIS] RE: [IBIS-Users] Fork-Endfork in IBIS EBD Models

There is a great example of this in the EBD section of the IBIS
specification, its a good read.

Also, you can always make a prototype file and pass it by the IBIS
Golden
Parser.  Which is a good idea whenever you create an IBIS file.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
Behalf Of mhaque@micron.com
Sent: Friday, December 30, 2005 1:33 PM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS-Users] Fork-Endfork in IBIS EBD Models


Hi All,
When creating IBIS EBD model for multi die package, is multiple fork and
endfork statement allowed for one main branch? For example if the device
has 4 die and from each pad bondwires are connected to one external ball
is it okay to describe the path description as below?

Note the last fork-endfork statement. Is it necessary that the original
path needs to be continued and therefore the path description has to end
with a series path?

[Path Description] QUAD_DIE_SIGNAL
A1
Len=0 R=16.646m L=1.406n C=0.456p /      |Substrate R, L and C

Fork
Len=0 R=10m L=1nH C=1p /             |Bondwire r,l,c from pin A1 to U1,
pad #21
Endfork
Node U1.21

Fork
Len=0 R=10m L=1nH C=1p /             |Bondwire r,l,c from pin A1 to U2,
pad #21
Endfork
Node U2.21

Fork 				|Bondwire r,l,c from pin A1 to U3, pad
#21
Len=0 R=10m L=1nH C=1p
Endfork
Node U3.21

Fork 				|Bondwire r,l,c from pin A1 to U4 , pad
#21
Len=0 R=10m L=1nH C=1p
Endfork
Node U4.21

Best Regards
Moshiul Haque
Micron Technology Inc.

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Received on Mon Jan 2 10:16:26 2006

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