On Wed, Feb 11, 2009 at 05:15:59PM -0800, Peter LaDow wrote:
> I have some testbench code that communicates (via signals) in
> zero-time.  For example, assume I have modules tbA and tbB.  tbA sends
> data to tbB by doing:

[...]

> The idea is that I can exchange information between testbench blocks
> in zero-time (i.e. not advancing the simulation) for things like
> control and logging.  I've paraphrased it above, but things aren't
> working.  I'd like to visualize the problem.  Gtkwave won't display
> anything because it seems to ignore the deltas.  And using ghwdump, I
> get the signal alias (apparently) rather than the name, and vectors
> are split into individual aliases.
> 
> So, is there any way to visualize these delta events so I can debug my 
> problems?

Delta events are not stored into vcd or ghw files. I once thought about dumping
them to .ghw but then gtkwave must be enhanced to display them.

The only way to display deltas is to use --trace-signals option.

Tristan.

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