Monday, January 05, 2009     Register | Login | Search | Contact Us
     
   
     
     

Many of you already received communications about the move of the Cadence user community into cadence.com. And many of you have already joined, with over 4000 registrations in the first two weeks.

The new Cadence Community enhances the ability of Cadence users to connect and collaborate. In addition to moving the community into cadence.com -- enabling single sign-on for community, Sourcelink and Cadence events -- the new site is organized around nine technology segments, giving you easy access to product information, training, forums and blogs. Some of the new features include:
  • Ability to respond to posts via e-mail
  • Technology-specific blogs
  • Latest Web 2.0 social networking capabilities
  • Public profile options
  • Private messaging
  • Friends lists
Visit the new Cadence Community today at www.cadence.com/community and join the discussions!

Registration note: Due to the scope of the enhancements and the new SSO registration system, we were not able to migrate existing cdnusers.org member accounts. So new registrations are required, but this enables a broader set of functionality we think you'll enjoy.

Forum note: Under the guidance of forum moderators, we have taken the 20+ cdnusers.org forums and consolidated them into 11 forums on the new site. Posts have been brought over so you can leverage that posting history. CDNusers forums will be set to read only starting 7/30, and cdnusers.org will be redirected to the new community on 8/4.

Best regards,
Mike and Tom

Michael A. Catrambone - Steering Committee Chairman
Distinguished Engineer
PCB/Mechanical
UTStarcom, Inc.

Tom Diederich
Cadence Community Manager
Home
Forums
Forums > Silicon-package-board > Signal Integrity and Modeling

Subject: help!!how can i do!!thanks
Posting to forums is available to community members only.
Login or Register
Rate this topic:
   
Author Messages
upton_zhou
Posts: 0
Online: User is Offline
6/27/2006 3:31 AM  

when i use probe in pcb SI to create waveform,the error happen . in tlsim.log ,it report as below:
""

 **** Tlsim Version 14.1 ****

 Tue Jun 27 18:14:20 2006

**** Tlsim command line ****
 tlsim -r 0.200000 -EIndVsrcDc -o waveforms.sim -dl delay.dl -dst distortion.dst -log tlsim.log -ocycle cycle.msm main.spc


Number of Nodes in this circuit = 77


Statistics on N-line elements:
 Number of 'n' type multi-conductor elements = 18
 Type-of-N-element  #elms Max_Length TotalLength

 1-line-N-elm     18   0.0528074    0.163241
 Total Interconnect Length = 0.163241
 Total Coupled Length = 0

 Following is some statistics on Model usage
   Model-Type      Model-Name     Number-of-Models-in-this-circuit

   bdrvr         MPC8220_SSTL_CLK_clksstl2class2_Typical               1
   bdrvr         DQ_FULL_Typical               1
   bdrvr         256MDDR_I_O_DQ_Typical               1
  No of 'Bdrvr' type model instance = 3

 Time Step at Start = 1.86667e-011


*********************************************************
  ABORT!: MATRIX FACTORIZATION FAILURE IN DC 
*********************************************************
 possible causes of this mishap are
1. Modelling inductors as ideal inductors:
try using the switch -EIndVsrcDc in the simulator command line.
This will model the inductors with small real dc resistance.
2. Look for dc offset currents in v-i data . If you have offset currents
you certainly need dc terminations!!


**** Transient Simulation Statistics ****

    Number Of time step solutions = 0

""
i donot know how to do!

can you tell me ?

thks!!
   best regard!!
upton_zhou
Posts: 0
Online: User is Offline
6/27/2006 3:32 AM  
sorry,,can tell me the detail step?
Kalevi2
Moderator
Posts: 69
Online: User is Offline
6/27/2006 3:54 AM  
Have you tried to extract the topology to SigXP? Have you tried another buffer model in place of the driver model. If the simulation works with another buffer, this is most likely caused by a bad IBIS model with inconsistent v-t curves.
Kai Keskinen
upton_zhou
Posts: 0
Online: User is Offline
6/27/2006 6:50 PM  
thanks !!!
i tried to extract the topology to SigXP ,but i know it is not right when use this model .
i wish you can tell me how can i do now!!
thanks
upton_zhou
Posts: 0
Online: User is Offline
6/27/2006 11:35 PM  
sorry!! i have another question : where input the "tlsim" command .
where "simulator command line"
Posting to forums is available to community members only.
Login or Register


ActiveForums 3.6
     
Copyright 2006 Cadence Design Systems, Inc.