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One of the best (and most under used) features of Modelsim is the
virtual signals feature.

Ok, so it needs a GUI to help create the functions/signals but I think
it's great and use it all the time to say.... create virtual enumerated
busses or quickly gate signals that I would otherwise have to change my
HDL, recompile and resimulate. etc.

However I've got this strange problem. I fire up Modelsim (6.1c) and
load in my .do files (Which include virtual signals and functions) run
my simulation and quit and for some strange reason Modelsim saves a
file called virtuals.do

This file has a copy of all virtual commands in my do files.

I run modelsim again and it appends the same entries over to this
virtuals.do.

Each time I run modelsim this file gets bigger and bigger until it
starts to slow down the simulator (when starting and exiting).

Can anyone explain to me this behaviour? I could understand if it just
saved newly created virtuals, but saving ones which have been loaded
in? And saving the same ones over and over again?

Any advice accepted.

Alex

On 8 Aug 2006 04:46:07 -0700, wrote:


>I run modelsim again and it appends the same entries over to this
>virtuals.do.

I didn't know that; but it seems to me that you can easily enough
get around it. When you load the sim, just do it with a little
script that first does
file delete virtual.do
so that your file is created afresh.

No promises - just a suggestion.

A bug report to Mentor sounds good, too
--
Jonathan Bromley, Consultant

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Jonathan Bromley wrote:
> On 8 Aug 2006 04:46:07 -0700, wrote:
> do it with a little script that first does file delete virtual.do

Sure but I was hoping for a parameter / command for modelsim.

wrote:

> Sure but I was hoping for a parameter / command for modelsim.

do you have the .pdfs?
check out "virtual save" options

-- Mike Treseler