Re: [sv-bc] How to debug if a verilog/SV simulation hangs ?

See also Cliff's paper --

http://www.sunburst-design.com/papers/CummingsSNUG2004Boston_2StateSims.
pdf

-- Brad

-----Original Message-----
From: owner-sv-bc@verilog.org [mailto:owner-sv-bc@verilog.org] On Behalf
Of Rich, Dave
Sent: Monday, June 12, 2006 2:23 PM
To: Nasim.Hussain@sun.com; sv-bc@verilog.org
Subject: RE: [sv-bc] How to debug if a verilog/SV simulation hangs ?

Converting an existing Verilog design to 2-state is unlikely to improve
performance by any significant measure. 

Try this forum:
http://www.verificationguild.com/modules.php?name=Forums&file=viewtopic&
t=1226


> -----Original Message-----
> From: owner-sv-bc@server.verilog.org [mailto:owner-sv-
> bc@server.verilog.org] On Behalf Of Nasim Hussain
> Sent: Monday, June 12, 2006 12:35 PM
> To: sv-bc@server.verilog.org
> Subject: [sv-bc] How to debug if a verilog/SV simulation hangs ?
> 
> hi-
> 
> i have run into bit of a problem and i know this might not be the
right
> alias for this, but i am asking for some advice.
> 
> i wanted to test out the feasibilities of using the systemverilog
> 2-state data types. my main objective is to observe if i get an
enhanced
> simulation performance, i am not trying to get rid of Xs in the design
> by simulating 0s / 1s only. i am also not trying to test real-life
> power on set / reset environments. i don't expect much of a
> performance boost, i am merely trying it as an exercise.
> 
> anyhow, i took an existing design in
> 
> 	verilog 1995 + verilog 2001 + NTB + OVA + PLI (tf + acc)
> 
> and am trying to change it to (~40% done so far)
> 
> 	systemverilog + SVTB + SVA + VPI
> 
> the design is not too big, it is a cluster (core + cache + memory)
> and is probably < 8-10M gates if you synthesize it. there are no
> bi-di's or tristate buses. everything is behavioral RTL. there were
> some X-assignments which i got rid of in the systemverilog
> transformation and i also got rid of several casex statements.
> 
> after i transformed it painstakingly, the simulation now hangs! how
> does one generally go about debugging a hang ? i am trying to
> put a lot of $display and narrowing it down, but are there any
> alternatives to that ? i am looking for one that does not
> involve me entering the CLI prompt for the simulator.
> 
> thanks.
> -nasim