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Forums > Silicon-package-board > Signal Integrity and Modeling

Subject: Running SigXplorer in Batch Mode
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marcelor
Posts: 3
Online: User is Offline
4/04/2006 1:41 AM  
I'm looking for information (links, documents, advices, etc.) on how to run a SigXplorer design in batch mode.

While it's easy to find in the tool's course book the tlsim batch mode documentation (Appendix A), I'm still missing a full flow - for example how to obtain from the SigXplorer design (.top file) the spice files (main/stimulus/comps/interconn.spc) and other required inputs for the tlsim run.

Thanks,
Marcelo.
Donald Telian
Posts: 42
Online: User is Offline
4/04/2006 12:49 PM  
Hi Marcelo,

I've spent a lot of time working with the SPICE files underneath the GUI.  It is powerful, once you get the hang of it.  Some ideas for you:

1) Type "tlsim" at a command prompt for a dump of the usage options
2) There is a switch to run SigXp on a .top without running up the GUI, I think it is -nograph.
3) All the .spc files are produced, and then called from main.spc.  You only have to tell tlsim where to find main.spc.
4) There was a nice appnote on allegrosi.com written by Patrick Riffault on how to batch SigXp .top files, but I can't seem to find it at the new site.  Anyone know where it went?

Hope that helps,
Donald
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
marcelor
Posts: 3
Online: User is Offline
4/05/2006 1:44 AM  
Hi Donald,

Thanks for your reply.
I successfully "played" a bit yesterday with tlsim.
What I'm missing is something like you mentioned in item #4, a flow to get all the required inputs for tlsim from my design (from .top file to .spc files and any other required input).
I believe it should be part of what happens when selecting "Analyze>Simulate" in SigXplorer (Skill function run?), but I need to find some documentation about it...

Regards,
Marcelo.
lwang
Posts: 0
Online: User is Offline
5/01/2006 2:18 PM  
The revised application note can be found at: http://www.cdnusers.org/Articles/Download/tabid/163/Default.aspx?title=SigXplorer%20Batch%20Mode%20Simulations

marcelor
Posts: 3
Online: User is Offline
5/04/2006 2:14 AM  
Thanks !
elie
Posts: 0
Online: User is Offline
5/04/2006 12:18 PM  

I ran a .top simulation case that generated the *.spc in
sigxp.run\case0\sim1
For example, I obtained an interconnect.spc as follow:

.subckt DESIGN_icn_ckt 1 2
* Display all elements first
NTLidlPart_21 (1 0) (2 0)
+L=0.0254 rlgc_name=STL_1S_1R_5 file=./ntl_rlgc.inc

.ends DESIGN_icn_ckt


Later, I went to the command prompte, and input:
spc2spc interconn.spc
I obtained the following spice file, main_gen.spc:

.subckt DESIGN_icn_ckt 1 2


XTLidlPart_21 1 2 0 rlgc_sub1


.subckt rlgc_sub1 1 2 9999
X1_1a 1 100 9999 rlgc_sub1a
X2_1a 100 101 9999 rlgc_sub1a
X3_1a 101 2 9999 rlgc_sub1a


.ends rlgc_sub1

.subckt rlgc_sub1a 11 12 999
C1_1a 12 999 5.3456e-013
L1_1a 11 13 4.40665e-009
R1_1a 13 12 0.0611742


.ends rlgc_sub1a

.ends DESIGN_icn_ckt


.end

Hope this is helpful.
Donald Telian
Posts: 42
Online: User is Offline
5/09/2006 8:50 AM  
Elie,

Looks like you meant to post that reply to the other thread about cutoff frequency?

What you are showing is how spc2spc converts the proprietary NTL (lossy, frequency-dependent transmission line model) into small RLC lumps that any spice tool can read.  It will choose the number of lumps based on the length of the line, and will use the RLGC data in ntl_rlgc.inc to determine the best RLC values.

Donald
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
elie
Posts: 0
Online: User is Offline
5/10/2006 8:02 AM  
Actually; he was wondering, and I quote:"I'm still missing a full flow - for example HOW TO OBTAIN from the SigXplorer design (.top file) the spice files (main/stimulus/comps/interconn.SPC)"
So he can't find the spc files, so I indicated the directory of the spc files could find. I also indicated how to get the spice files; Although I was not sure he needs it. Yet, I am certain this would be of use to many in the industry.
I have not gone detailing the batch mode because I did not 'play' with it recently.
The other question is simple, you only need to think which section of the signal contains the changing fields.
This is it. Although, your manuals don't mention the equation, and I am not defending you,
yet it is well known relationship.
elie
Posts: 0
Online: User is Offline
5/10/2006 8:12 AM  
" Although, your manuals don't mention the equation"
At least the manuals that I have seen..
elie
Posts: 0
Online: User is Offline
5/15/2006 8:40 PM  
"..which section of the signal contains the changing fields.."
The signal is composed of fundamental and harmonics of high frequencies
Yet, It is the edges that indicate the presence of several high frequency components, which
trigger varying field effects, and increasing electromoagnetic force that will
impact the line elements
elie
Posts: 0
Online: User is Offline
5/17/2006 8:40 AM  
And let's emphasis, that beside the edges, the middle sections are statics
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