myhdl-list

[myhdl-list] Icarus Verilog and MyHDL

[Vijay K. <ec...@ni...>]

Hi,
I would like to use MyHDL for co simulation with Icarus Verilog. But the test 
programs are not getting simulated. The assertion (verilog_time & 0xFFFF.. == 
myhdl... * 1000 + delta) (Ok, that is approx what the assertion is. But I guess 
you can understand which one it is.) is failing.

I understand what is happening(I read the docs for co simulation with Icarus 
verilog) but I do not know what to do! Like I said even the test programs that 
came with MyHDL fail to co-simulate.

Please help me.

Vijay


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[myhdl-list] Re: Icarus Verilog and MyHDL

[Jan D. <ja...@ja...>]

Vijay Kumar wrote:
> Hi,
> I would like to use MyHDL for co simulation with Icarus Verilog. But the test 
> programs are not getting simulated. The assertion (verilog_time & 0xFFFF.. == 
> myhdl... * 1000 + delta) (Ok, that is approx what the assertion is. But I guess 
> you can understand which one it is.) is failing.
> 
> I understand what is happening(I read the docs for co simulation with Icarus 
> verilog) but I do not know what to do! Like I said even the test programs that 
> came with MyHDL fail to co-simulate.
> 
> Please help me.

Let's try. I *suspect* that this relates to the issue
mentioned in the cosimulation/icarus/README.txt file,
repeated here:

"""
Between snapshot 20030518 (used in MyHDL 0.3), and 20031009, the
Icarus scheduler has been improved. This requires a small update
of myhdl.c. The current version is supposed to work with recent
snapshots - the older version is available in myhdl.c.20030518.
"""

In other words, make sure you use a version of myhdl.c which is
compatible with your Icarus. I would advise you to use a recent
Icarus snapshot and myhdl 0.4; those should work together
(although I don't check all Icarus snapshots).

In my development I just added cosimulation support for Cver;
this worked with the latest myhdl.c almost unchanged. This
suggests that the scheduling as done in more recent Icarus snapshots
is indeed the better way.

I noticed a flaw of mine: the file myhdl.c.20030518 is not
in the MyHDL 0.4 distribution as promised. My current
distutils setup doesn't pick it up - use myhdl.c from
MyHDL 0.3 if you must have it.

If problems persist, let me know, but please do include
version information of all tools.

Regards, Jan

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