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Simulators >> Circuit Simulators >> march wavefroms
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Message started by modern_analog on Dec 29^th, 2005, 6:14pm

Title: march wavefroms
Post by modern_analog on Dec 29^th, 2005, 6:14pm

What exactly do we gain by clicking on
"to be marched" in the main Analog artist window.

I tried it but I didn't see any benefit.

Title: Re: march wavefroms
Post by sheldon on Dec 30^th, 2005, 3:05am

Modern_analog,

What version of IC are you using? The use model
has changed over the years.

Best Regards,

Sheldon

Title: Re: march wavefroms
Post by sheldon on Dec 30^th, 2005, 3:37am

Modern_analog,

Sorry, let me try again. The purpose of marching
waveforms is to allow designers to see the progress
of their simulations and terminate the simulation if
there is an issue. Originally, the waveforms were
plotted continuously, that is, marched. However, users
found that this required too much overhead so now
waveform "snapshots" are taken whenever the
designer requests. After you select a waveform to
march and start the simulation, you can take a
snapshot by clicking on the plot waveform button.

The benefits of Marching waveforms are:
1) You don't waste time on simulations that are
producing incorrect results. You don't want to
wait a week to find out the results are junk.
2) Selected march waveforms is a useful tool
because you don't want to dig through 100
waveforms to find the one you want to see.

Marching is a very useful productivity enhancing
tool for designers.

Best Regards,

Sheldon

Title: Re: march wavefroms
Post by Andrew Beckett on Jan 3^rd, 2006, 9:54pm

Sheldon's post is a little misleading. With the spectre interface, the Outputs->To be marched menu is greyed out, because it is not used. This was the interface to the old marching waveform capability which had poor performance, and also the resulting waveform window was rather limited in how you could use it.

In order to select waveforms to "snapshot", you would normally set up the Outputs pane in ADE (either using the Outputs->to be plotted menu, or the Outputs->setup menu. Then, when the simulation is running, simply hit the plot outputs icon, and it will pause the simulation, tell the simulator to flush its buffers, read the results, and plot the waveforms, before asking the simulator to continue. You do not use Outputs->to be marched to select waveforms to snapshot.

Regards,

Andrew.