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

Subject: tlsim error!!! help?where fing simulator commmand line
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upton_zhou
Posts: 0
Online: User is Offline
6/28/2006 1:26 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!!
Kalevi2
Moderator
Posts: 69
Online: User is Offline
6/28/2006 4:04 AM  
Now that you have your topology extracted, try a different buffer model for the driver. This looks like DDR2 so use another DDR2 driver to replace your current driver. If you still get the same error, replace the receiver model. If you still get the same error, look at your topology very closely. There is something funny in it. Just use a process of elimination. I suspect your driver model but it could also be the package model in the driver or receiver or, less likely, something strange in your topology.
Kai Keskinen
upton_zhou
Posts: 0
Online: User is Offline
6/28/2006 7:07 PM  
thanks ,Keskinen!!
i have tried this way you tell me above yesterday. and the same status happened.
expect you reply!
thks
Kalevi2
Moderator
Posts: 69
Online: User is Offline
6/29/2006 4:02 AM  
Have you tried running the driver into the receiver through a 2" transmission line with 50 Ohm impedance? Does it work? Which part of the circuit is the problem (Driver, topology, Receiver)? If replacing one element fixes it, then you found your problem. If not, I suggest you open up a ticket with Cadence through SourceLink and submit your files to them.
Kai Keskinen
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Forums > Silicon-package-board > Signal Integrity and Modeling > tlsim error!!! help?where fing simulator commmand line


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