delorie.com/archives/browse.cgi   search  
Mail Archives: geda-user/2012/02/20/01:05:52

X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
Received-SPF: pass (google.com: domain of russd AT asu DOT edu designates 10.220.227.197 as permitted sender) client-ip=10.220.227.197;
Authentication-Results: mr.google.com; spf=pass (google.com: domain of russd AT asu DOT edu designates 10.220.227.197 as permitted sender) smtp.mail=russd AT asu DOT edu
MIME-Version: 1.0
In-Reply-To: <4F41DD58.8030607@optonline.net>
References: <4F41CB0A DOT 2020902 AT optonline DOT net>
<201202200517 DOT q1K5HrUD026271 AT envy DOT delorie DOT com>
<4F41DD58 DOT 8030607 AT optonline DOT net>
Date: Sun, 19 Feb 2012 23:05:46 -0700
Message-ID: <CAN0Jx--75G6GW0uqA13AEpeM9Dbw4QxrRmtzFMGUOTmXtoYsww@mail.gmail.com>
Subject: Re: [geda-user] verilog question - blocking/non-blocking
From: Russell Dill <Russ DOT Dill AT asu DOT edu>
To: geda-user AT delorie DOT com
X-Gm-Message-State: ALoCoQk/Ohw1EObqwCiMTRVjmOt2r8G7P3uUiQr3u5xQxU/IWzfxQsUgyslGwOhx27woPGkf0P0B
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id q1K65naw028715
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com

> I suppose the "=" (blocking) makes the code sequential, like C - if that
> clarifies it some. But I was really wondering how the synthesis tools deal
> with this. I almost always avoid using the "=" form.  It doesn't bother me
> that my states are off (delayed) by 1 clock tick.  So in my 2nd example,
> during simulation do_something runs when the counter is 1 not 0. Not really
> a big deal. In the first example, do_something runs when the counter is 0.
> Makes looking at the waveforms, and the counter, line up nice but what the
> heck does the synthesis tool build?

Xilinx has a series of great videos on how to make verilog that their
tool likes. It generally offers a pretty good explaination of why
things should be done a certain way and the information is probably
useful across other synthesis tools.

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019