Deploying to main from @ amaranth-lang/amaranth@f2fdc41 🚀

docs/amaranth/latest/_sources/changes.rst.txt

@@ -66,10 +66,20 @@ Platform integration changes
 * Changed: the Gowin platform now uses ``nextpnr-himbaechel`` rather than ``nextpnr-gowin``.
 
 
-Version 0.5.2 (unreleased)
+Version 0.5.3 (unreleased)
 ==========================
 
 
+Language changes
+----------------
+
+* Added: individual bits of the same signal can now be assigned from different modules or domains.
+
+
+Version 0.5.2
+=============
+
+
 Standard library changes
 ------------------------
 

docs/amaranth/latest/_sources/guide.rst.txt

@@ -940,7 +940,7 @@ If the name of a domain is not known upfront, the ``m.d["<domain>"] += ...`` syn
 
 .. _lang-signalgranularity:
 
-Every signal included in the target of an assignment becomes a part of the domain, or equivalently, *driven* by that domain. A signal can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal to two different domains:
+Every signal bit included in the target of an assignment becomes a part of the domain, or equivalently, *driven* by that domain. A signal bit can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal bit to two different domains:
 
 .. doctest::
 
@@ -949,19 +949,15 @@ Every signal included in the target of an assignment becomes a part of the domai
    >>> m.d.sync += d.eq(0)
    Traceback (most recent call last):
      ...
-   amaranth.hdl.dsl.SyntaxError: Driver-driver conflict: trying to drive (sig d) from d.sync, but it is already driven from d.comb
+   amaranth.hdl.dsl.SyntaxError: Driver-driver conflict: trying to drive (sig d) bit 0 from d.sync, but it is already driven from d.comb
 
-.. note::
-
-   Clearly, Amaranth code that drives a single bit of a signal from two different domains does not describe a meaningful circuit. However, driving two different bits of a signal from two different domains does not inherently cause such a conflict. Would Amaranth accept the following code?
+However, two different bits of a signal can be driven from two different domains without an issue:
 
-   .. code-block::
-
-      e = Signal(2)
-      m.d.comb += e[0].eq(0)
-      m.d.sync += e[1].eq(1)
+.. testcode::
 
-   The answer is no. While this kind of code is occasionally useful, rejecting it greatly simplifies backends, simulators, and analyzers.
+   e = Signal(2)
+   m.d.comb += e[0].eq(1)
+   m.d.sync += e[1].eq(0)
 
 In addition to assignments, :ref:`assertions <lang-assert>` and :ref:`debug prints <lang-print>` can be added using the same syntax.
 

docs/amaranth/latest/_static/documentation_options.js

@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '0.6.0.dev56',
+    VERSION: '0.6.0.dev57',
     LANGUAGE: 'en',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',

docs/amaranth/latest/changes.rst

@@ -66,10 +66,20 @@ Platform integration changes
 * Changed: the Gowin platform now uses ``nextpnr-himbaechel`` rather than ``nextpnr-gowin``.
 
 
-Version 0.5.2 (unreleased)
+Version 0.5.3 (unreleased)
 ==========================
 
 
+Language changes
+----------------
+
+* Added: individual bits of the same signal can now be assigned from different modules or domains.
+
+
+Version 0.5.2
+=============
+
+
 Standard library changes
 ------------------------
 

docs/amaranth/latest/contrib.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Contributing &mdash; Amaranth language &amp; toolchain 0.6.0.dev56 documentation</title>
+  <title>Contributing &mdash; Amaranth language &amp; toolchain 0.6.0.dev57 documentation</title>
       <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=80d5e7a1" />
       <link rel="stylesheet" type="text/css" href="_static/css/theme.css?v=19f00094" />
       <link rel="stylesheet" type="text/css" href="_static/platformpicker.css" />
@@ -17,7 +17,7 @@
 
         <script src="_static/jquery.js?v=5d32c60e"></script>
         <script src="_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=6de5cc12"></script>
+        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=c99d480b"></script>
         <script src="_static/doctools.js?v=888ff710"></script>
         <script src="_static/sphinx_highlight.js?v=4825356b"></script>
         <script src="_static/platformpicker.js"></script>
@@ -40,7 +40,7 @@
               <img src="_static/logo.png" class="logo" alt="Logo"/>
           </a>
               <div class="version">
-                0.6.0.dev56
+                0.6.0.dev57
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">

docs/amaranth/latest/cover.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Amaranth project documentation &mdash; Amaranth language &amp; toolchain 0.6.0.dev56 documentation</title>
+  <title>Amaranth project documentation &mdash; Amaranth language &amp; toolchain 0.6.0.dev57 documentation</title>
       <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=80d5e7a1" />
       <link rel="stylesheet" type="text/css" href="_static/css/theme.css?v=19f00094" />
       <link rel="stylesheet" type="text/css" href="_static/platformpicker.css" />
@@ -17,7 +17,7 @@
 
         <script src="_static/jquery.js?v=5d32c60e"></script>
         <script src="_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=6de5cc12"></script>
+        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=c99d480b"></script>
         <script src="_static/doctools.js?v=888ff710"></script>
         <script src="_static/sphinx_highlight.js?v=4825356b"></script>
         <script src="_static/platformpicker.js"></script>
@@ -40,7 +40,7 @@
               <img src="_static/logo.png" class="logo" alt="Logo"/>
           </a>
               <div class="version">
-                0.6.0.dev56
+                0.6.0.dev57
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">

docs/amaranth/latest/genindex.html

@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Index &mdash; Amaranth language &amp; toolchain 0.6.0.dev56 documentation</title>
+  <title>Index &mdash; Amaranth language &amp; toolchain 0.6.0.dev57 documentation</title>
       <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=80d5e7a1" />
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       <link rel="stylesheet" type="text/css" href="_static/platformpicker.css" />
@@ -16,7 +16,7 @@
 
         <script src="_static/jquery.js?v=5d32c60e"></script>
         <script src="_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=6de5cc12"></script>
+        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=c99d480b"></script>
         <script src="_static/doctools.js?v=888ff710"></script>
         <script src="_static/sphinx_highlight.js?v=4825356b"></script>
         <script src="_static/platformpicker.js"></script>
@@ -38,7 +38,7 @@
               <img src="_static/logo.png" class="logo" alt="Logo"/>
           </a>
               <div class="version">
-                0.6.0.dev56
+                0.6.0.dev57
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">

docs/amaranth/latest/guide.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Language guide &mdash; Amaranth language &amp; toolchain 0.6.0.dev56 documentation</title>
+  <title>Language guide &mdash; Amaranth language &amp; toolchain 0.6.0.dev57 documentation</title>
       <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=80d5e7a1" />
       <link rel="stylesheet" type="text/css" href="_static/css/theme.css?v=19f00094" />
       <link rel="stylesheet" type="text/css" href="_static/platformpicker.css" />
@@ -17,7 +17,7 @@
 
         <script src="_static/jquery.js?v=5d32c60e"></script>
         <script src="_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=6de5cc12"></script>
+        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=c99d480b"></script>
         <script src="_static/doctools.js?v=888ff710"></script>
         <script src="_static/sphinx_highlight.js?v=4825356b"></script>
         <script src="_static/platformpicker.js"></script>
@@ -41,7 +41,7 @@
               <img src="_static/logo.png" class="logo" alt="Logo"/>
           </a>
               <div class="version">
-                0.6.0.dev56
+                0.6.0.dev57
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
@@ -985,25 +985,21 @@ <h3>Signal shapes<a class="headerlink" href="#signal-shapes" title="Permalink to
 <span class="n">add_toggle</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
 </pre></div>
 </div>
-<p id="lang-signalgranularity">Every signal included in the target of an assignment becomes a part of the domain, or equivalently, <em>driven</em> by that domain. A signal can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal to two different domains:</p>
+<p id="lang-signalgranularity">Every signal bit included in the target of an assignment becomes a part of the domain, or equivalently, <em>driven</em> by that domain. A signal bit can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal bit to two different domains:</p>
 <div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">d</span> <span class="o">=</span> <span class="n">Signal</span><span class="p">()</span>
 <span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">comb</span> <span class="o">+=</span> <span class="n">d</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
 <span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">sync</span> <span class="o">+=</span> <span class="n">d</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
 <span class="gt">Traceback (most recent call last):</span>
 <span class="w">  </span><span class="c">...</span>
-<span class="gr">amaranth.hdl.dsl.SyntaxError</span>: <span class="n">Driver-driver conflict: trying to drive (sig d) from d.sync, but it is already driven from d.comb</span>
+<span class="gr">amaranth.hdl.dsl.SyntaxError</span>: <span class="n">Driver-driver conflict: trying to drive (sig d) bit 0 from d.sync, but it is already driven from d.comb</span>
 </pre></div>
 </div>
-<div class="admonition note">
-<p class="admonition-title">Note</p>
-<p>Clearly, Amaranth code that drives a single bit of a signal from two different domains does not describe a meaningful circuit. However, driving two different bits of a signal from two different domains does not inherently cause such a conflict. Would Amaranth accept the following code?</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">e</span> <span class="o">=</span> <span class="n">Signal</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
-<span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">comb</span> <span class="o">+=</span> <span class="n">e</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
-<span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">sync</span> <span class="o">+=</span> <span class="n">e</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<p>However, two different bits of a signal can be driven from two different domains without an issue:</p>
+<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">e</span> <span class="o">=</span> <span class="n">Signal</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
+<span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">comb</span> <span class="o">+=</span> <span class="n">e</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="n">m</span><span class="o">.</span><span class="n">d</span><span class="o">.</span><span class="n">sync</span> <span class="o">+=</span> <span class="n">e</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">eq</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
 </pre></div>
 </div>
-<p>The answer is no. While this kind of code is occasionally useful, rejecting it greatly simplifies backends, simulators, and analyzers.</p>
-</div>
 <p>In addition to assignments, <a class="reference internal" href="#lang-assert"><span class="std std-ref">assertions</span></a> and <a class="reference internal" href="#lang-print"><span class="std std-ref">debug prints</span></a> can be added using the same syntax.</p>
 </section>
 <section id="assignment-order">

docs/amaranth/latest/guide.rst

@@ -940,7 +940,7 @@ If the name of a domain is not known upfront, the ``m.d["<domain>"] += ...`` syn
 
 .. _lang-signalgranularity:
 
-Every signal included in the target of an assignment becomes a part of the domain, or equivalently, *driven* by that domain. A signal can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal to two different domains:
+Every signal bit included in the target of an assignment becomes a part of the domain, or equivalently, *driven* by that domain. A signal bit can be either undriven or driven by exactly one domain; it is an error to add two assignments to the same signal bit to two different domains:
 
 .. doctest::
 
@@ -949,19 +949,15 @@ Every signal included in the target of an assignment becomes a part of the domai
    >>> m.d.sync += d.eq(0)
    Traceback (most recent call last):
      ...
-   amaranth.hdl.dsl.SyntaxError: Driver-driver conflict: trying to drive (sig d) from d.sync, but it is already driven from d.comb
+   amaranth.hdl.dsl.SyntaxError: Driver-driver conflict: trying to drive (sig d) bit 0 from d.sync, but it is already driven from d.comb
 
-.. note::
-
-   Clearly, Amaranth code that drives a single bit of a signal from two different domains does not describe a meaningful circuit. However, driving two different bits of a signal from two different domains does not inherently cause such a conflict. Would Amaranth accept the following code?
+However, two different bits of a signal can be driven from two different domains without an issue:
 
-   .. code-block::
-
-      e = Signal(2)
-      m.d.comb += e[0].eq(0)
-      m.d.sync += e[1].eq(1)
+.. testcode::
 
-   The answer is no. While this kind of code is occasionally useful, rejecting it greatly simplifies backends, simulators, and analyzers.
+   e = Signal(2)
+   m.d.comb += e[0].eq(1)
+   m.d.sync += e[1].eq(0)
 
 In addition to assignments, :ref:`assertions <lang-assert>` and :ref:`debug prints <lang-print>` can be added using the same syntax.
 

docs/amaranth/latest/index.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Language &amp; toolchain &mdash; Amaranth language &amp; toolchain 0.6.0.dev56 documentation</title>
+  <title>Language &amp; toolchain &mdash; Amaranth language &amp; toolchain 0.6.0.dev57 documentation</title>
       <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=80d5e7a1" />
       <link rel="stylesheet" type="text/css" href="_static/css/theme.css?v=19f00094" />
       <link rel="stylesheet" type="text/css" href="_static/platformpicker.css" />
@@ -17,7 +17,7 @@
 
         <script src="_static/jquery.js?v=5d32c60e"></script>
         <script src="_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=6de5cc12"></script>
+        <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=c99d480b"></script>
         <script src="_static/doctools.js?v=888ff710"></script>
         <script src="_static/sphinx_highlight.js?v=4825356b"></script>
         <script src="_static/platformpicker.js"></script>
@@ -41,7 +41,7 @@
               <img src="_static/logo.png" class="logo" alt="Logo"/>
           </a>
               <div class="version">
-                0.6.0.dev56
+                0.6.0.dev57
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
@@ -189,7 +189,8 @@ <h1>Language &amp; toolchain<a class="headerlink" href="#language-toolchain" tit
 <li class="toctree-l1"><a class="reference internal" href="changes.html">Changelog</a><ul>
 <li class="toctree-l2"><a class="reference internal" href="changes.html#documentation-for-past-releases">Documentation for past releases</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-6-0-unreleased">Version 0.6.0 (unreleased)</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-5-2-unreleased">Version 0.5.2 (unreleased)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-5-3-unreleased">Version 0.5.3 (unreleased)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-5-2">Version 0.5.2</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-5-1">Version 0.5.1</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-5-0">Version 0.5.0</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changes.html#version-0-4-0">Version 0.4.0</a></li>