RE: $finish and final_step

Note that in SystemVerilog, $finish executes "final" procedures before
exiting. "final" procedures are parallel to "initial" procedures, but
executed at the end of simulation whereas "initial" procedures are
executed at the beginning.

Shalom 

> -----Original Message-----
> From: owner-verilog-ams@server.eda.org 
> [mailto:owner-verilog-ams@server.eda.org] On Behalf Of Martin O'Leary
> Sent: Thursday, March 27, 2008 1:37 AM
> To: David Miller; Xavier Bestel
> Cc: Verilog-AMS LRM Committee
> Subject: RE: $finish and final_step
> 
> David, Xavier
> I don't think it is such a straight-forward thing to say. The 
> answer below seems to only cover $finish executed in an analog block.
> 
> In digital, a $finish immediately terminates the simulation. 
> For AMS, it doesn't make sense to me that we require digital 
> to then execute the analog solver to do another time step in 
> order to execute the @final_step blocks after a $finish is 
> encountered when normally a digital simulators terminate 
> immediately when a $finish occurs.
> 
> Also LRM2.2 says that $finish "simply makes the simulator 
> exit" so this would seem to not be a backwardly compatible change.
> 
> Thanks,
> --Martin 
> 
> -----Original Message-----
> From: owner-verilog-ams@eda.org 
> [mailto:owner-verilog-ams@eda.org] On Behalf Of David Miller
> Sent: Wednesday, March 26, 2008 8:35 AM
> To: Xavier Bestel
> Cc: Verilog-AMS LRM Committee
> Subject: Re: $finish and final_step
> 
> Hello Xavier,
> 
> yes, $finish should cleanly stop the simulation by converging 
> on this timestep and executing any final_step blocks.
> 
> $stop should converge on the current timestep but not execute 
> final_step blocks.
> 
> Main difference between $finish and $stop is that $stop is 
> more like a pause - the simulation can be resumed. $finish 
> terminates the simulation.
> 
> I am not sure why this is not highlighted in the LRM - I know 
> that we discuss the simulation control tasks but seems that 
> adding in this behaviour explicitly was missed. I will make a 
> note to get it added into next draft of 2.3
> 
> 
> Cheers...
> Dave
> 
> 
> Xavier Bestel wrote:
> > Hi,
> > 
> > should $finish execute the step again with final_step events on ?
> > I didn't see it specified in the LRM, in a way or in the other.
> > 
> > Thanks,
> > 	Xav
> > 
> > 
> 
> --
> =====================================
> -- David Miller
> -- Design Technology (Austin)
> -- Freescale Semiconductor
> -- Ph : 512 996-7377 Fax: x7755
> =====================================
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