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2017-07-17 12:12:18 -05:00
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<li class="toctree-l3"><a class="reference internal" href="../PythonCpp/DBoHierarchy.html#intermediate-class-header">4.3 Intermediate Class Header</a></li>
<li class="toctree-l3"><a class="reference internal" href="../PythonCpp/DBoHierarchy.html#intermediate-class-file">4.4 Intermediate Class File</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../PythonCpp/DbU.html">6. Encapsulating DbU</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#physical-grid-lambda-value">Physical Grid &amp; Lambda Value</a></li>
<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#the-mbk-to-rds-segment-table">The <code class="docutils literal"><span class="pre">MBK_TO_RDS_SEGMENT</span></code> table</a></li>
<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#the-mbk-to-rds-via-table">The <code class="docutils literal"><span class="pre">MBK_TO_RDS_VIA</span></code> table</a></li>
<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#the-mbk-to-rds-bigvia-hole-table">The <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_HOLE</span></code> table</a></li>
<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#the-mbk-to-rds-bigvia-metal-table">The <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_METAL</span></code> table</a></li>
<li class="toctree-l3"><a class="reference internal" href="../RDS/RDSpage.html#the-mbk-wiresetting-table">The <code class="docutils literal"><span class="pre">MBK_WIRESETTING</span></code> table</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../lefapi/lefapi.html#understanding-units">Understanding Units</a></li>
<li class="toctree-l3"><a class="reference internal" href="../lefapi/lefapi.html#callback-calling-order">Callback Calling Order</a></li>
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<div class="section" id="python-interface-for-hurricane-coriolis">
<span id="python-interface-to-coriolis"></span><h1>Python Interface for <span class="sc">Hurricane</span> / <span class="sc">Coriolis</span><a class="headerlink" href="#python-interface-for-hurricane-coriolis" title="Permalink to this headline"></a></h1>
<p>The (almost) complete interface of <span class="sc">Hurricane</span> is exported as a <span class="sc">Python</span> module
and some part of the other components of <span class="sc">Coriolis</span> (each one in a separate
module). The interface has been made to mirror as closely as possible the
C++ one, so the C++ doxygen documentation could be used to write code with
either languages.</p>
<p><a class="reference external" href="file:../../../index.html">Summary of the C++ Documentation</a></p>
<p>A script could be run directly in text mode from the command line or through
the graphical interface (see <a class="reference internal" href="ViewerTools.html#python-scripts-in-cgt"><span class="std std-ref">Executing Python Scripts in Cgt</span></a>).</p>
<p>Asides for this requirement, the python script can contain anything valid
in <span class="sc">Python</span>, so don&#8217;t hesitate to use any package or extention.</p>
<p>Small example of Python/Stratus script:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">Hurricane</span> <span class="k">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">Stratus</span> <span class="k">import</span> <span class="o">*</span>
<span class="k">def</span> <span class="nf">doSomething</span> <span class="p">():</span>
<span class="c1"># ...</span>
<span class="k">return</span>
<span class="k">def</span> <span class="nf">ScriptMain</span> <span class="p">(</span> <span class="o">**</span><span class="n">kw</span> <span class="p">):</span>
<span class="n">editor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">kw</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="s1">&#39;editor&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="n">kw</span><span class="p">[</span><span class="s1">&#39;editor&#39;</span><span class="p">]:</span>
<span class="n">editor</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">&#39;editor&#39;</span><span class="p">]</span>
<span class="n">stratus</span><span class="o">.</span><span class="n">setEditor</span><span class="p">(</span> <span class="n">editor</span> <span class="p">)</span>
<span class="n">doSomething</span><span class="p">()</span>
<span class="k">return</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span> <span class="p">:</span>
<span class="n">kw</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">success</span> <span class="o">=</span> <span class="n">ScriptMain</span><span class="p">(</span> <span class="o">**</span><span class="n">kw</span> <span class="p">)</span>
<span class="n">shellSuccess</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">success</span><span class="p">:</span> <span class="n">shellSuccess</span> <span class="o">=</span> <span class="mi">1</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span> <span class="n">shellSuccess</span> <span class="p">)</span>
<span class="n">ScriptMain</span> <span class="p">()</span>
</pre></div>
</div>
<p>This typical script can be executed in two ways:</p>
<ol class="arabic">
<li><p class="first">Run directly as a <span class="sc">Python</span> script, thanks to the</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span> <span class="p">:</span>
</pre></div>
</div>
<p>part (this is standart <span class="sc">Python</span>). It is a simple adapter that will
calls <span class="cb">ScriptMain()</span>.</p>
</li>
<li><p class="first">Through <span class="cb">cgt</span>, either in text or graphical mode. In that case, the
<span class="cb">ScriptMain()</span> is directly called trough a sub-interpreter.
The arguments of the script are passed through the <code class="docutils literal"><span class="pre">**kw</span></code> dictionnary.</p>
<table border="1" class="docutils">
<colgroup>
<col width="32%" />
<col width="68%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head" colspan="2">**kw Dictionnary</th>
</tr>
<tr class="row-even"><th class="head">Parameter Key/Name</th>
<th class="head">Contents type</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">'cell'</span></code></td>
<td>A Hurricane cell on which to work. Depending
on the context, it may be <code class="docutils literal"><span class="pre">None</span></code>.
For example, when run from <span class="cb">cgt</span>, it the cell
currently loaded in the viewer, if any.</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">'editor'</span></code></td>
<td>The viewer from which the script is run, when
lauched through <span class="cb">cgt</span>.</td>
</tr>
</tbody>
</table>
</li>
</ol>
<div class="section" id="plugins">
<h2>Plugins<a class="headerlink" href="#plugins" title="Permalink to this headline"></a></h2>
<p>Plugins are <span class="sc">Python</span> scripts specially crafted to integrate with <span class="cb">cgt</span>.
Their entry point is a <span class="cb">ScriptMain()</span> method as described in
<a class="reference internal" href="#python-interface-to-coriolis">Python Interface to Coriolis</a>. They can be called by user scripts
through this method.</p>
<div class="section" id="chip-placement">
<h3>Chip Placement<a class="headerlink" href="#chip-placement" title="Permalink to this headline"></a></h3>
<p>Automatically perform the placement of a complete chip. This plugin, as well
as the other P&amp;R tools expect a specific top-level hierarchy for the design.
The top-level hierarchy must contains the instances of all the I/O pads and
<strong>exactly one</strong> instance of the chip&#8217;s core model.</p>
<p> <a class="reference internal" href="../_images/chip-structure-1.png"><img alt="Chip Top Structure" class="align-middle" src="../_images/chip-structure-1.png" style="width: 90%;" /></a> </p>
<p>The designer must provide a configuration file that define the rules for the
placement of the top-level hierarchy (that is, the pads and the core).
This file must be named after the chip&#8217;s name, by appending <code class="docutils literal"><span class="pre">_chip.py</span></code>
(obviously, it is a <span class="sc">Python</span> file). For instance if the chip netlist file
is called <code class="docutils literal"><span class="pre">amd2901_crl.vst</span></code>, then the configuration file must be named
<code class="docutils literal"><span class="pre">amd2901_crl_chip.vst</span></code>.</p>
<p>Example of chip placement configuration file (for <code class="docutils literal"><span class="pre">AM2901</span></code>):</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">chip</span> <span class="o">=</span> \
<span class="p">{</span> <span class="s1">&#39;pads.south&#39;</span> <span class="p">:</span> <span class="p">[</span> <span class="s1">&#39;p_a3&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_a2&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_a1&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_r0&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_vddick0&#39;</span><span class="p">,</span> <span class="s1">&#39;p_vssick0&#39;</span><span class="p">,</span> <span class="s1">&#39;p_a0&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i6&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_i8&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i7&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_r3&#39;</span> <span class="p">]</span>
<span class="p">,</span> <span class="s1">&#39;pads.east&#39;</span> <span class="p">:</span> <span class="p">[</span> <span class="s1">&#39;p_zero&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i0&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i1&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i2&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_vddeck0&#39;</span><span class="p">,</span> <span class="s1">&#39;p_vsseck0&#39;</span><span class="p">,</span> <span class="s1">&#39;p_q3&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_b0&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_b1&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_b2&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_b3&#39;</span> <span class="p">]</span>
<span class="p">,</span> <span class="s1">&#39;pads.north&#39;</span> <span class="p">:</span> <span class="p">[</span> <span class="s1">&#39;p_noe&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_y3&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_y2&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_y1&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_y0&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_vddeck1&#39;</span><span class="p">,</span> <span class="s1">&#39;p_vsseck1&#39;</span><span class="p">,</span> <span class="s1">&#39;p_np&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_ovr&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_cout&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_ng&#39;</span> <span class="p">]</span>
<span class="p">,</span> <span class="s1">&#39;pads.west&#39;</span> <span class="p">:</span> <span class="p">[</span> <span class="s1">&#39;p_cin&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i4&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i5&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_i3&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_ck&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_d0&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_d1&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_d2&#39;</span>
<span class="p">,</span> <span class="s1">&#39;p_d3&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_q0&#39;</span> <span class="p">,</span> <span class="s1">&#39;p_f3&#39;</span> <span class="p">]</span>
<span class="p">,</span> <span class="s1">&#39;core.size&#39;</span> <span class="p">:</span> <span class="p">(</span> <span class="mi">1500</span><span class="p">,</span> <span class="mi">1500</span> <span class="p">)</span>
<span class="p">,</span> <span class="s1">&#39;chip.size&#39;</span> <span class="p">:</span> <span class="p">(</span> <span class="mi">3000</span><span class="p">,</span> <span class="mi">3000</span> <span class="p">)</span>
<span class="p">,</span> <span class="s1">&#39;chip.clockTree&#39;</span> <span class="p">:</span> <span class="kc">True</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The file must contain <em>one dictionnary</em> named <code class="docutils literal"><span class="pre">chip</span></code>.</p>
<table border="1" class="docutils">
<colgroup>
<col width="29%" />
<col width="71%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head" colspan="2">Chip Dictionnary</th>
</tr>
<tr class="row-even"><th class="head">Parameter Key/Name</th>
<th class="head">Value/Contents type</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">'pad.south'</span></code></td>
<td>Ordered list (left to right) of pad instances names
to put on the south side of the chip</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">'pad.east'</span></code></td>
<td>Ordered list (down to up) of pad instances names
to put on the east side of the chip</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">'pad.north'</span></code></td>
<td>Ordered list (left to right) of pad instances names
to put on the north side of the chip</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">'pad.west'</span></code></td>
<td>Ordered list (down to up) of pad instances names
to put on the west side of the chip</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">'core.size'</span></code></td>
<td>The size of the core (to be used by the placer)</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">'chip.size'</span></code></td>
<td>The size of the whole chip. The sides must be great
enough to accomodate all the pads</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">'chip.clockTree'</span></code></td>
<td>Whether to generate a clock tree or not. This calls
the ClockTree plugin</td>
</tr>
</tbody>
</table>
<p>Configuration parameters, defaults are defined in <code class="docutils literal"><span class="pre">etc/coriolis2/&lt;STECHNO&gt;/plugins.conf</span></code>.</p>
<table border="1" class="docutils">
<colgroup>
<col width="43%" />
<col width="22%" />
<col width="35%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Parameter Identifier</th>
<th class="head">Type</th>
<th class="head">Default</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td colspan="3"><strong>Chip Plugin Parameters</strong></td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.block.rails.count</span></code></td>
<td>TypeInt</td>
<td><span class="cb">5</span></td>
</tr>
<tr class="row-even"><td colspan="2">The minimum number of rails around the core
block. Must be odd and suppérior to 5.
One rail for the clock and at least two pairs
of power/grounds</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.block.rails.hWidth</span></code></td>
<td>TypeInt</td>
<td><span class="cb">12</span></td>
</tr>
<tr class="row-even"><td colspan="2">The horizontal with of the rails</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.block.rails.vWidth</span></code></td>
<td>TypeInt</td>
<td><span class="cb">12</span></td>
</tr>
<tr class="row-even"><td colspan="2">The vertical with of the rails</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.block.rails.hSpacing</span></code></td>
<td>TypeInt</td>
<td><span class="cb">6</span></td>
</tr>
<tr class="row-even"><td colspan="2">The spacing, <em>edge to edge</em> of two adjacent
horizontal rails</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.block.rails.vSpacing</span></code></td>
<td>TypeInt</td>
<td><span class="cb">6</span></td>
</tr>
<tr class="row-even"><td colspan="2">The spacing, <em>edge to edge</em> of two adjacent
vertical rails</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.pad.pck</span></code></td>
<td>TypeString</td>
<td><span class="cb">pck_px</span></td>
</tr>
<tr class="row-even"><td colspan="2">The model name of the pad connected to the
chip external clock</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.pad.pvddeck</span></code></td>
<td>TypeString</td>
<td><span class="cb">pvddeck_px</span></td>
</tr>
<tr class="row-even"><td colspan="2">The model name of the pad connected to the
<code class="docutils literal"><span class="pre">vdde</span></code> (external power) and suppling it to
the core</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.pad.pvsseck</span></code></td>
<td>TypeString</td>
<td><span class="cb">pvsseck_px</span></td>
</tr>
<tr class="row-even"><td colspan="2">The model name of the pad connected to the
<code class="docutils literal"><span class="pre">vsse</span></code> (external ground) and suppling it to
the core</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.pad.pvddick</span></code></td>
<td>TypeString</td>
<td><span class="cb">pvddick_px</span></td>
</tr>
<tr class="row-even"><td colspan="2">The model name of the pad connected to the
<code class="docutils literal"><span class="pre">vddi</span></code> (internal power) and suppling it to
the core</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">chip.pad.pvssick</span></code></td>
<td>TypeString</td>
<td><span class="cb">pvssick_px</span></td>
</tr>
<tr class="row-even"><td colspan="2">The model name of the pad connected to the
<code class="docutils literal"><span class="pre">vssi</span></code> (internal ground) and suppling it to
the core</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If no clock tree is generated, then the clock rail is <em>not</em> created.
So even if the requested number of rails <code class="docutils literal"><span class="pre">chip.block.rails.count</span></code> is, say 5,
only four rails (2* <code class="docutils literal"><span class="pre">power</span></code>, 2* <code class="docutils literal"><span class="pre">ground</span></code>) will be generateds.</p>
</div>
</div>
<div class="section" id="clock-tree">
<h3>Clock Tree<a class="headerlink" href="#clock-tree" title="Permalink to this headline"></a></h3>
<p>Insert a clock tree into a block. The clock tree uses the H strategy.
The clock net is splitted into sub-nets, one for each branch of the
tree.</p>
<ul>
<li><p class="first">On <strong>chips</strong> design, the sub-nets are createds in the model of the
core block (then trans-hierarchically flattened to be shown at
chip level).</p>
</li>
<li><p class="first">On <strong>blocks</strong>, the sub nets are created directly in the top block.</p>
</li>
<li><p class="first">The sub-nets are named according to a simple geometrical scheme.
A common prefix <code class="docutils literal"><span class="pre">ck_htree</span></code>, then one postfix by level telling
on which quarter of plane the sub-clock is located:</p>
<ol class="arabic simple">
<li><code class="docutils literal"><span class="pre">_bl</span></code>: bottom left plane quarter.</li>
<li><code class="docutils literal"><span class="pre">_br</span></code>: bottom right plane quarter.</li>
<li><code class="docutils literal"><span class="pre">_tl</span></code>: top left plane quarter.</li>
<li><code class="docutils literal"><span class="pre">_tr</span></code>: top right plane quarter.</li>
</ol>
<p>We can have <code class="docutils literal"><span class="pre">ck_htree_bl</span></code>, <code class="docutils literal"><span class="pre">ck_htree_bl_bl</span></code>, <code class="docutils literal"><span class="pre">ch_htree_bl_tl</span></code> and so on.</p>
</li>
</ul>
<p>The clock tree plugin works in four steps:</p>
<ol class="arabic simple">
<li>Build the clock tree: creates the top-block abutment box, compute the
levels of H tree neededs and place the clock buffers.</li>
<li>Once the clock buffers are placed, calls the placer (<span class="sc">Etesian</span>) to place
the ordinary standart cells, whithout disturbing clock H-tree buffers.</li>
<li>At this point we know the exact positions of all the DFFs, so we can
connect them to the nearest H-tree leaf clock signal.</li>
<li>Leaf clock signals that are not connecteds to any DFFs are removed.</li>
</ol>
<p>Netlist reorganisation:</p>
<ul class="simple">
<li>Obviously the top block or chip core model netlist is modificated to
contains all the clock sub-nets. The interface is <em>not</em> changed.</li>
<li>If the top block contains instances of other models <em>and</em> those models
contains DFFs that get re-connecteds to the clock sub-nets (from the
top level). Change both the model netlist and interface to propagate
the relevant clock sub-nets to the instanciated model. The new model
with the added clock signal is renamed with a <code class="docutils literal"><span class="pre">_clocked</span></code> suffix.
For example, the sub-block model <code class="docutils literal"><span class="pre">ram.vst</span></code> will become <code class="docutils literal"><span class="pre">ram_clocked.vst</span></code>.</li>
</ul>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you are to re-run the clock tree plugin on a netlist, be careful
to erase any previously generated <code class="docutils literal"><span class="pre">_clocked</span></code> file (both netlist and
layout: <code class="docutils literal"><span class="pre">rm</span> <span class="pre">*.clocked.{ap,vst}</span></code>). And restart <span class="cb">cgt</span> to clear it&#8217;s
memory cache.</p>
</div>
<p>Configuration parameters, defaults are defined in <code class="docutils literal"><span class="pre">etc/coriolis2/&lt;STECHNO&gt;/plugins.conf</span></code>.</p>
<table border="1" class="docutils">
<colgroup>
<col width="43%" />
<col width="22%" />
<col width="35%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Parameter Identifier</th>
<th class="head">Type</th>
<th class="head">Default</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td colspan="3"><strong>ClockTree Plugin Parameters</strong></td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">clockTree.minimumSide</span></code></td>
<td>TypeInt</td>
<td><span class="cb">300</span></td>
</tr>
<tr class="row-even"><td colspan="2">The minimum size below which the clock tree
will stop to perform quadri-partitions</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">clockTree.buffer</span></code></td>
<td>TypeString</td>
<td><span class="cb">buf_x2</span></td>
</tr>
<tr class="row-even"><td colspan="2">The buffer model to use to drive sub-nets</td>
</tr>
<tr class="row-odd"><td rowspan="2"><code class="docutils literal"><span class="pre">clockTree.placerEngine</span></code></td>
<td>TypeString</td>
<td><span class="cb">Etesian</span></td>
</tr>
<tr class="row-even"><td colspan="2">The placer to use. Other value is <code class="docutils literal"><span class="pre">Mauka</span></code>
the simulated annealing placer which will go
into retirement very soon</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="recursive-save-rsave">
<h3>Recursive-Save (RSave)<a class="headerlink" href="#recursive-save-rsave" title="Permalink to this headline"></a></h3>
<p>Perform a recursive top down save of all the models from the top cell
loaded in <span class="cb">cgt</span>. Force a write of any non-terminal model. This plugin is used
by the clock tree plugin after the netlist clock sub-nets creation.</p>
</div>
</div>
<div class="section" id="a-simple-example-am2901">
<h2>A Simple Example: AM2901<a class="headerlink" href="#a-simple-example-am2901" title="Permalink to this headline"></a></h2>
<p>To illustrate the capabilities of <span class="sc">Coriolis</span> tools and <span class="sc">Python</span> scripting, a small
example, derived from the <span class="sc">Alliance</span> <span class="cb">AM2901</span> is supplied.</p>
<p>This example contains only the synthetized netlists and the <span class="cb">doChip.py</span> script
which perform the whole P&amp;R of the design.</p>
<p>You can generate the chip using one of the following method:</p>
<ol class="arabic">
<li><p class="first"><strong>Command line mode:</strong> directly run the script:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">dummy</span><span class="nd">@lepka</span><span class="p">:</span><span class="n">AM2901</span><span class="o">&gt;</span> <span class="o">./</span><span class="n">doChip</span> <span class="o">-</span><span class="n">V</span> <span class="o">--</span><span class="n">cell</span><span class="o">=</span><span class="n">amd2901</span>
</pre></div>
</div>
</li>
<li><p class="first"><strong>Graphic mode:</strong> launch <span class="cb">cgt</span>, load chip netlist <code class="docutils literal"><span class="pre">amd2901</span></code> (the top cell)
then run the <span class="sc">Python</span> script <span class="cb">doChip.py</span>.</p>
</li>
</ol>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>Between two consecutive run, be sure to erase the netlist/layout generateds:</p>
<div class="last highlight-default"><div class="highlight"><pre><span></span><span class="n">dummy</span><span class="nd">@lepka</span><span class="p">:</span><span class="n">AM2901</span><span class="o">&gt;</span> <span class="n">rm</span> <span class="o">*</span><span class="n">clocked</span><span class="o">*.</span><span class="n">vst</span> <span class="o">*.</span><span class="n">ap</span>
</pre></div>
</div>
</div>
</div>
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