The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> Simulation results not stored after 184ms
https://designers-guide.org/forum/YaBB.pl?num=1278069552

Message started by iep on Jul 2^nd, 2010, 4:19am

Title: Simulation results not stored after 184ms
Post by iep on Jul 2^nd, 2010, 4:19am

I am running some simple simulations on a very basic block comprising a few switches and some large resistors and caps. Due to the size of the resistors and caps, the time constants invloved are very long (up to 1 second). So, my transient simulaiton time is set to 1 second.

The problem is that when I plot the waveforms (or print the data points) the data stops at 184ms. The issue is not related to number of data points as I have used the strobe and maxstep settings to force a smaller or greater number of points. Whether I force 1000 or 100000 points, the data always stops at 184ms.

I should add that the output log reports no errors or warnings and shows that the simulation has run for the full 1 second. I have tried both the Wavescan and AWD calculators/vieres and the simple directplot functions.

I have also added a clock source to the sim so that there is a voltage node that varies constantly, but this has made no difference.

Can anyone advise? Is there a max sim length setting that I am missing?

Cheers.

Title: Re: Simulation results not stored after 184ms
Post by pancho_hideboo on Jul 2^nd, 2010, 5:04am

iep wrote on Jul 2^nd, 2010, 4:19am:

Due to the size of the resistors and caps, the time constants invloved are very long (up to 1 second).
So, my transient simulaiton time is set to 1 second.
..............................................................................................................
The problem is that when I plot the waveforms (or print the data points) the data stops at 184ms.

Show me simulator's name, vendor's name and version of simulator which you use.

Confirm data size. Is it 2GByte ?
See http://www.designers-guide.org/Forum/YaBB.pl?num=1235309563/1#1

Title: Re: Simulation results not stored after 184ms
Post by oermens on Jul 2^nd, 2010, 9:39am

Assuming you use spectre simulator and WaveScan from IC5141, add this to your .cshrc (or whatever your environment setup script is).

setenv PSF_WRITE_CHUNK_MODE_ON true

Make sure your output format is PSF, this doesn't work for SST2. If you are using IC61x then it may be something else, I have not have this problem with ViVA as it has no size limitation. If you still have the simulation results and they are in SST2 format you can use SimVision.

Title: Re: Simulation results not stored after 184ms
Post by iep on Jul 5^th, 2010, 1:26am

False alarm. After reebooting the machine I was running on, all is well.

For the record, was using Cadence ICFB 5.1.41

iep