RE: initialization order

Hi Xavier,
 
Sorry for replying late as I was on vacation. The short answer is yes,
the digital initial block is run first. Here is the relevant
descriptions in the LRM2.3:
 
Section 8.3.2 states:
For mixed-signal DC analysis, the processes of the analog DC analysis
and the digital simulation at time 0 are executed iteratively, starting
with the initialization state (including analog and digital) defined in
circuit initialization (8.3.1).
 
Section 8.3.1 states:
The initialization phase of mixed-signal simulation is the process of
initializing the circuit state for analysis tasks such as DC, transient,
and AC. It is a one time execution of nodeset statements (3.4.3.2), and
then the procedures in analog initial block and Verilog initial block.
 
Note that analog initial block is something new (and still open to be
added to chapter 6) and equivalent to digital initial block, which is
run before any analysis. Analog initial_step is part of an analysis such
as DC in your example.
 
Thanks,
--Junwei



owner-verilog-ams@server.eda.org wrote on 04-03-2008 18:37:34:

> Hi again,
> 
> does anyone have a hint of an answer on this question ?
> 
> Thanks,
>    Xav
> 
> On Wed, 2008-02-27 at 16:00 +0100, Xavier Bestel wrote:
> > Hi,
> > 
> > when you have a design with both a initial block (digital) and an
> > initial_step (in the analog block), is there a designated execution
> > order ?
> > 
> > Apparently, there's a Kundert testcase where there's a division by a
> > digital signal, in the initial_step. That would implicitly mean that
the
> > initial block should be ran first by the simulator.
> > 
> > However I can't find any thace of this in the LRM. Could someone
> > enlighten me please ?
> > 
> > Thanks,
> > 
> >    Xav
> 
> 
> -- 
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
> 

-- 
This message has been scanned for viruses and 
dangerous content by MailScanner <http://www.mailscanner.info/> , and is

believed to be clean. 

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.