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<li class="toctree-l2 current"><a class="current reference internal" href="#">Symbolic Layout</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#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="#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="#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="#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="#the-mbk-wiresetting-table">The <code class="docutils literal"><span class="pre">MBK_WIRESETTING</span></code> table</a></li>
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<div class="section" id="symbolic-layout">
<h1>Symbolic Layout<a class="headerlink" href="#symbolic-layout" title="Permalink to this headline"></a></h1>
<div class="section" id="symbolic-components">
<h2>Symbolic Components<a class="headerlink" href="#symbolic-components" title="Permalink to this headline"></a></h2>
<p>A symbolic layout is, in practice, made of only of three objects:</p>
<table border="1" class="docutils">
<colgroup>
<col width="30%" />
<col width="13%" />
<col width="57%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Object</th>
<th class="head"><span class="sc">mbk</span></th>
<th class="head">Explanation</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>Segments</td>
<td><code class="docutils literal"><span class="pre">phseg</span></code></td>
<td>Oriented segments with a width and an orientation.</td>
</tr>
<tr class="row-odd"><td>VIAs &amp; contacts</td>
<td><code class="docutils literal"><span class="pre">phvia</span></code></td>
<td>Boils down to just a point.</td>
</tr>
<tr class="row-even"><td>Big VIAs &amp; Big Contacts</td>
<td><code class="docutils literal"><span class="pre">phvia</span></code></td>
<td>Point with a width and a height
That is a rectangle of width by height centered
on the VIA coordinates.</td>
</tr>
</tbody>
</table>
<p>Each of thoses objects is associated to a <em>symbolic layer</em> which will
control how the object is translated in many <em>real rectangles</em>.</p>
<table border="1" class="docutils">
<colgroup>
<col width="11%" />
<col width="19%" />
<col width="16%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head"><span class="sc">mbk</span></th>
<th class="head">Layer Name</th>
<th class="head">Usable By</th>
<th class="head">Usage</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td rowspan="12"><code class="docutils literal"><span class="pre">phseg</span></code></td>
<td><span class="sc">nwell</span></td>
<td>Segment</td>
<td>N Well</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">PWELL</span></code></td>
<td>Segment</td>
<td>P Well</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">NDIF</span></code></td>
<td>Segment</td>
<td>N Diffusion</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">PDIF</span></code></td>
<td>Segment</td>
<td>P Diffusion</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">NTIE</span></code></td>
<td>Segment</td>
<td>N Tie</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">PTIE</span></code></td>
<td>Segment</td>
<td>P Tie</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">NTRANS</span></code></td>
<td>Segment</td>
<td>N transistor, in <span class="sc">Alliance</span>, a transistor
is represented as a segment (it&#8217;s grid).</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">PTRANS</span></code></td>
<td>Segment</td>
<td>P transistor</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">POLY</span></code></td>
<td>Segment</td>
<td>Polysilicium</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">ALUx</span></code></td>
<td>Segment</td>
<td>Metal level <em>x</em></td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">CALUx</span></code></td>
<td>Segment</td>
<td>Metal level <em>x</em>, that can be used by the
upper hierarchical level as a connector.
From the layout point of view it is the
same as <code class="docutils literal"><span class="pre">ALUx</span></code>.</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">TALUx</span></code></td>
<td>Segment</td>
<td>Blockage for metal level <em>x</em>. Will
diseappear in the real layout as it is an
information for the P&amp;R tools only.</td>
</tr>
<tr class="row-even"><td rowspan="9"><code class="docutils literal"><span class="pre">phvia</span></code></td>
<td><code class="docutils literal"><span class="pre">CONT_BODY_N</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact to N Well</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">CONT_BODY_P</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact to P Well</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">CONT_DIF_N</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact to N Diffusion</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">CONT_DIF_P</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact to P Diffusion</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">CONT_POLY</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact to polysilicium</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">CONT_VIA</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact between metal1 and metal2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">CONT_VIAx</span></code></td>
<td>VIA, BIGVIA</td>
<td>Contact between metal <em>x</em> and metal <em>x+1</em>.
The index is the the one of the bottom
metal of the VIA.</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">C_X_N</span></code></td>
<td>VIA</td>
<td>N transistor corner, to build transistor
bend. Not used anymore in recent technos</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">C_X_P</span></code></td>
<td>VIA</td>
<td>P transistor corner, to build transistor
bend. Not used anymore in recent technos</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Not all association of object and symbolic layers are meaningful.
For instance you cannot associate a contact to a <code class="docutils literal"><span class="pre">NTRANS</span></code> layer.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The symbolic layer associated with blockages is prefixed by a <code class="docutils literal"><span class="pre">T</span></code>,
for <em>transparency</em>, which may seems silly. It is for historical reasons,
it started as a true transparency, but at some point we had to invert
the meaning (blockage) with the rise of over-the-cell routing, but the
name stuck...</p>
</div>
</div>
<div class="section" id="symbolic-segments">
<h2>Symbolic Segments<a class="headerlink" href="#symbolic-segments" title="Permalink to this headline"></a></h2>
<p>In <span class="sc">Alliance</span>, segments are oriented (up, down, left, right). This disambiguate
the left or right side when using the <code class="docutils literal"><span class="pre">LCW</span></code> and <code class="docutils literal"><span class="pre">RCW</span></code> rules in the <span class="sc">rds</span> file.
It allows to generate, if needed, asymetric object in the real layout file.</p>
<p> <a class="reference internal" href="../_images/SegmentOrientation.png"><img alt="Symbolic Segment Orientations" class="align-middle" src="../_images/SegmentOrientation.png" style="width: 50%;" /></a> </p>
<p></p>
</div>
</div>
<div class="section" id="the-rds-file">
<h1>The RDS File<a class="headerlink" href="#the-rds-file" title="Permalink to this headline"></a></h1>
<p>The RDS file control how a symbolic layout is transformed into it&#8217;s real
conterpart.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><strong>Unit used inside the RDS file:</strong> all units are expressed in micrometers.</p>
</div>
<p>Alliance tools relying on the RDS file, and what layers are active for them:</p>
<table border="1" class="docutils">
<colgroup>
<col width="47%" />
<col width="16%" />
<col width="37%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Tool</th>
<th class="head">Name</th>
<th class="head">RDS Flags</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>Layout editor</td>
<td><code class="docutils literal"><span class="pre">graal</span></code></td>
<td><code class="docutils literal"><span class="pre">ALL</span></code></td>
</tr>
<tr class="row-odd"><td>Design Rule Checker</td>
<td><code class="docutils literal"><span class="pre">druc</span></code></td>
<td><code class="docutils literal"><span class="pre">ALL</span></code>, <code class="docutils literal"><span class="pre">DRC</span></code></td>
</tr>
<tr class="row-even"><td>Electrical extractor</td>
<td><code class="docutils literal"><span class="pre">cougar</span></code></td>
<td><code class="docutils literal"><span class="pre">ALL</span></code>, <code class="docutils literal"><span class="pre">EXT</span></code></td>
</tr>
<tr class="row-odd"><td>The symbolic to real layout translator</td>
<td><code class="docutils literal"><span class="pre">s2r</span></code></td>
<td><code class="docutils literal"><span class="pre">ALL</span></code></td>
</tr>
</tbody>
</table>
<div class="section" id="physical-grid-lambda-value">
<h2>Physical Grid &amp; Lambda Value<a class="headerlink" href="#physical-grid-lambda-value" title="Permalink to this headline"></a></h2>
<p>RDS file:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">DEFINE</span> <span class="n">PHYSICAL_GRID</span> <span class="mf">0.005</span>
<span class="n">DEFINE</span> <span class="n">LAMBDA</span> <span class="mf">0.09</span>
</pre></div>
</div>
<p>Tells that the physical grid (founder grid) step is 0.005µm and the lambda has
a value of 0.09µm. That is, one lambda is 18 grid steps.</p>
<p>We can distinguish two kind of <span class="sc">rds</span> files:</p>
<ul class="simple">
<li>The <em>1µm</em> kind, odd segment widths and coordinates are allowed, but the <code class="docutils literal"><span class="pre">LAMBDA</span></code>
value <strong>must</strong> represent an <em>even</em> number of foundry grid step.</li>
<li>The <em>2µm</em> kind, segments widths and coordinates must all be even. And in that case
the <code class="docutils literal"><span class="pre">LAMBDA</span></code> value can be any multiple of the foundry grid.</li>
</ul>
</div>
<div class="section" id="the-mbk-to-rds-segment-table">
<h2>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_SEGMENT</span></code> table<a class="headerlink" href="#the-mbk-to-rds-segment-table" title="Permalink to this headline"></a></h2>
<p>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_SEGMENT</span></code> table control the way segments are translated into
real rectangles. Be aware that we are translating <em>segments</em> and not <em>rectangles</em>.
Segments are defined by their axis (source &amp; target points) and their width.
The geometrical transformations are described according to that model.
Obviously, they are either horizontal or vertical.</p>
<p>The translation method of a symbolic segment is as follow:</p>
<ol class="arabic">
<li><p class="first">The segment is translated into one or more physical rectangles.
The generated rectangles depends on the tool which is actually
using <span class="sc">rds</span> and the flag for the considered real layer.
For instance, real layers flagged with <code class="docutils literal"><span class="pre">DRC</span></code> will be generated
for <code class="docutils literal"><span class="pre">s2r</span></code> (for the <code class="docutils literal"><span class="pre">cif</span></code> or <code class="docutils literal"><span class="pre">gds</span></code>) and <code class="docutils literal"><span class="pre">druc</span></code>, but will not
be shown under <code class="docutils literal"><span class="pre">graal</span></code>.</p>
</li>
<li><p class="first">Translation into one real layer. <em>First</em> the source &amp; target coordinates and width
of the symbolic segment are multiplied by the <code class="docutils literal"><span class="pre">LAMBDA</span></code> value to obtain a real
segment. <em>Then</em> one of the <code class="docutils literal"><span class="pre">VW</span></code>, <code class="docutils literal"><span class="pre">LCW</span></code> or <code class="docutils literal"><span class="pre">RCW</span></code> transformation is applied to
that segment to get the final real rectangle.</p>
<ul>
<li><p class="first"><code class="docutils literal"><span class="pre">VW</span></code> for Variable Width, expand the real layer staying centered from the
original one. In those rules, the third number is not used, it is only here
to make the life easier for the parser...</p>
<p> <a class="reference internal" href="../_images/RDS_VW.png"><img alt="RDS Variable Width Rule" class="align-middle" src="../_images/RDS_VW.png" style="width: 60%;" /></a> </p>
</li>
<li><p class="first"><code class="docutils literal"><span class="pre">LCW</span></code> or <code class="docutils literal"><span class="pre">RCW</span></code> for Left/Right Constant Width, create an off-center rectangle
of fixed width relatively to the real segment. Note that the <code class="docutils literal"><span class="pre">SP</span></code> number
is the distance <em>between the edge</em> of the real segment and the edge of the
generated real rectangle (<em>not</em> from the axis). It is often zero.</p>
<p> <a class="reference internal" href="../_images/RDS_LCW.png"><img alt="RDS Left Constant Width Rule" class="align-middle" src="../_images/RDS_LCW.png" style="width: 40%;" /></a> </p>
</li>
</ul>
</li>
</ol>
<p></p>
<p>Examples:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TABLE</span> <span class="n">MBK_TO_RDS_SEGMENT</span>
<span class="c1"># (Case 1)</span>
<span class="n">ALU1</span> <span class="n">RDS_ALU1</span> <span class="n">VW</span> <span class="mf">0.18</span> <span class="mf">0.09</span> <span class="mf">0.0</span> <span class="n">ALL</span>
<span class="c1"># (Case 2)</span>
<span class="n">NDIF</span> <span class="n">RDS_NDIF</span> <span class="n">VW</span> <span class="mf">0.18</span> <span class="mf">0.0</span> <span class="mf">0.0</span> <span class="n">ALL</span> \
<span class="n">RDS_ACTIV</span> <span class="n">VW</span> <span class="mf">0.18</span> <span class="mf">0.0</span> <span class="mf">0.0</span> <span class="n">DRC</span> \
<span class="n">RDS_NIMP</span> <span class="n">VW</span> <span class="mf">0.36</span> <span class="mf">0.36</span> <span class="mf">0.0</span> <span class="n">DRC</span>
<span class="c1"># (Case 3)</span>
<span class="n">NTRANS</span> <span class="n">RDS_POLY</span> <span class="n">VW</span> <span class="mf">0.27</span> <span class="mf">0.00</span> <span class="mf">0.0</span> <span class="n">ALL</span> \
<span class="n">RDS_GATE</span> <span class="n">VW</span> <span class="mf">0.27</span> <span class="mf">0.00</span> <span class="mf">0.0</span> <span class="n">DRC</span> \
<span class="n">RDS_NDIF</span> <span class="n">LCW</span> <span class="mf">0.0</span> <span class="mf">0.27</span> <span class="mf">0.0</span> <span class="n">EXT</span> \
<span class="n">RDS_NDIF</span> <span class="n">RCW</span> <span class="mf">0.0</span> <span class="mf">0.27</span> <span class="mf">0.0</span> <span class="n">EXT</span> \
<span class="n">RDS_NDIF</span> <span class="n">VW</span> <span class="mf">0.0</span> <span class="mf">0.72</span> <span class="mf">0.0</span> <span class="n">DRC</span> \
<span class="n">RDS_ACTIV</span> <span class="n">VW</span> <span class="mf">0.0</span> <span class="mf">0.72</span> <span class="mf">0.0</span> <span class="n">ALL</span> \
<span class="n">RDS_NIMP</span> <span class="n">VW</span> <span class="mf">0.18</span> <span class="mf">1.26</span> <span class="mf">0.0</span> <span class="n">DRC</span>
<span class="n">END</span>
</pre></div>
</div>
<p><span class="fboxtt">Case 1</span> the <code class="docutils literal"><span class="pre">ALU1</span></code> is translated in exacltly one real rectangle of
<code class="docutils literal"><span class="pre">RDS_ALU1</span></code>, both ends are extended by 0.18µm and it&#8217;s width is increased
by 0.09µm.</p>
<p><span class="fboxtt">Case 2</span> the <code class="docutils literal"><span class="pre">NDIF</span></code> will be translated into only one segment
under <code class="docutils literal"><span class="pre">graal</span></code>, for symbolic visualization. And into three real rectangles
for <code class="docutils literal"><span class="pre">s2r</span></code> and <code class="docutils literal"><span class="pre">druc</span></code>.</p>
<p><span class="fboxtt">Case 3</span> the <code class="docutils literal"><span class="pre">NTRANS</span></code>, associated to a transistor is a little bit
more complex, the generated shapes are different for the extractor <code class="docutils literal"><span class="pre">cougar</span></code>
in one hand, and for both <code class="docutils literal"><span class="pre">druc</span></code> &amp; <code class="docutils literal"><span class="pre">s2r</span></code> in the other hand.</p>
<ul>
<li><p class="first">For the extractor (<code class="docutils literal"><span class="pre">EXT</span></code> &amp; <code class="docutils literal"><span class="pre">ALL</span></code> flags) there will be four rectangles
generateds:</p>
<ol class="arabic simple">
<li>The gate (<code class="docutils literal"><span class="pre">RDS_GATE</span></code>)</li>
<li>The left diffusion of the transistor (source or drain) (<code class="docutils literal"><span class="pre">RDS_NDIF</span></code>).</li>
<li>The right diffusion of the transistor (drain or source) (<code class="docutils literal"><span class="pre">RDS_NDIF</span></code>).</li>
<li>The active area (<code class="docutils literal"><span class="pre">RDS_ACTIV</span></code>).</li>
</ol>
<p>As the extractor must kept separate the source and the drain of the transistor,
they are generated as two offset rectangles, using the <code class="docutils literal"><span class="pre">LCW</span></code> and <code class="docutils literal"><span class="pre">RCW</span></code> directives.</p>
</li>
<li><p class="first">For <code class="docutils literal"><span class="pre">s2r</span></code> and <code class="docutils literal"><span class="pre">druc</span></code> (<code class="docutils literal"><span class="pre">DRC</span></code> and <code class="docutils literal"><span class="pre">ALL</span></code>), five rectangles are generateds:</p>
<ol class="arabic simple">
<li>The poly (<code class="docutils literal"><span class="pre">RDS_POLY</span></code>).</li>
<li>The gate (<code class="docutils literal"><span class="pre">RDS_GATE</span></code>).</li>
<li>The diffusion, as one rectangle that covers both the <code class="docutils literal"><span class="pre">LCW</span></code> and the <code class="docutils literal"><span class="pre">RCW</span></code> (<code class="docutils literal"><span class="pre">RDS_NDIF</span></code>).</li>
<li>The active area (<code class="docutils literal"><span class="pre">RDS_ACTIV</span></code>).</li>
<li>The N implantation (<code class="docutils literal"><span class="pre">RDS_NIMP</span></code>).</li>
</ol>
<p>In the layout send to the foundry, the source &amp; drain are draw as one rectangle
across the gate area (the transistor being defined by the intersection of both
rectangles).</p>
</li>
</ul>
<p></p>
</div>
<div class="section" id="the-mbk-to-rds-via-table">
<h2>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_VIA</span></code> table<a class="headerlink" href="#the-mbk-to-rds-via-table" title="Permalink to this headline"></a></h2>
<p>This table is to translate <em>default</em> VIAs into real via. In the symbolic layout
the default VIA is simply a point and a set of layers. All layers are converted
in squares shapes centered on the VIA coordinate. The one dimension given is the
size of the side of that square.</p>
<p>Note that although we are refering to VIAs, which for the purists are between two
metal layers, this table also describe <em>contacts</em>.</p>
<p>Example:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TABLE</span> <span class="n">MBK_TO_RDS_VIA</span>
<span class="n">CONT_DIF_P</span> <span class="n">RDS_PDIF</span> <span class="mf">0.54</span> <span class="n">ALL</span> \
<span class="n">RDS_CONT</span> <span class="mf">0.18</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU1</span> <span class="mf">0.36</span> <span class="n">ALL</span> \
<span class="n">RDS_ACTIV</span> <span class="mf">0.54</span> <span class="n">DRC</span> \
<span class="n">RDS_PIMP</span> <span class="mf">0.90</span> <span class="n">DRC</span>
<span class="n">CONT_POLY</span> <span class="n">RDS_POLY</span> <span class="mf">0.54</span> <span class="n">ALL</span> \
<span class="n">RDS_CONT</span> <span class="mf">0.18</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU1</span> <span class="mf">0.36</span> <span class="n">ALL</span>
<span class="n">CONT_VIA</span> <span class="n">RDS_ALU1</span> <span class="mf">0.45</span> <span class="n">ALL</span> \
<span class="n">RDS_VIA1</span> <span class="mf">0.27</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU2</span> <span class="mf">0.45</span> <span class="n">ALL</span>
<span class="n">END</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><strong>In CONT_DIF_P</strong> you may see that only three layers will be shown under
<code class="docutils literal"><span class="pre">graal</span></code>, but five will be generated in the <code class="docutils literal"><span class="pre">gds</span></code> layout.</p>
</div>
</div>
<div class="section" id="the-mbk-to-rds-bigvia-hole-table">
<h2>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_HOLE</span></code> table<a class="headerlink" href="#the-mbk-to-rds-bigvia-hole-table" title="Permalink to this headline"></a></h2>
<p>In <code class="docutils literal"><span class="pre">s2r</span></code>, when generating BIGVIAs, the matrix of holes they contains is
not draw relative to the position of the BIGVIA itself, but on a grid which
is common througout all the design real layout. This is to allow overlap
between two BIGVIA without risking the holes matrix to be not exactly overlapping.
As a consequence, when visualizing the <code class="docutils literal"><span class="pre">gds</span></code> file, the holes may not be centerend
inside one individual BIGVIA.</p>
<p>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_HOLE</span></code> table define the global hole matrix for the whole
design. The first number is the individual hole side and the second the grid step
(edge to edge). The figure below show the hole generation.</p>
<p> <a class="reference internal" href="../_images/bigvia-1.png"><img alt="BIGVIA holes" class="align-middle" src="../_images/bigvia-1.png" style="width: 40%;" /></a> </p>
<p>Example of BIGVIA overlap:</p>
<p> <a class="reference internal" href="../_images/bigvia-2.png"><img alt="BIGVIA holes overlap" class="align-middle" src="../_images/bigvia-2.png" style="width: 40%;" /></a> </p>
<p>Example:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TABLE</span> <span class="n">MBK_TO_RDS_BIGVIA_HOLE</span>
<span class="n">CONT_VIA</span> <span class="n">RDS_VIA1</span> <span class="mf">0.27</span> <span class="mf">0.27</span> <span class="n">ALL</span>
<span class="n">CONT_VIA2</span> <span class="n">RDS_VIA2</span> <span class="mf">0.27</span> <span class="mf">0.27</span> <span class="n">ALL</span>
<span class="n">CONT_VIA3</span> <span class="n">RDS_VIA3</span> <span class="mf">0.27</span> <span class="mf">0.27</span> <span class="n">ALL</span>
<span class="n">CONT_VIA4</span> <span class="n">RDS_VIA4</span> <span class="mf">0.27</span> <span class="mf">0.27</span> <span class="n">ALL</span>
<span class="n">CONT_VIA5</span> <span class="n">RDS_VIA5</span> <span class="mf">0.36</span> <span class="mf">0.36</span> <span class="n">ALL</span>
<span class="n">END</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><strong>BIGVIA demotion.</strong> If the size of the bigvia is too small, there is
a possibility that no hole from the global matrix will be under it.
To avoid that case, if the either side of the BIGVIA is less than
<code class="docutils literal"><span class="pre">1.5</span> <span class="pre">*</span> <span class="pre">step</span></code>, the BIGVIA is demoted to a simple VIA.</p>
</div>
</div>
<div class="section" id="the-mbk-to-rds-bigvia-metal-table">
<h2>The <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_METAL</span></code> table<a class="headerlink" href="#the-mbk-to-rds-bigvia-metal-table" title="Permalink to this headline"></a></h2>
<p>This table describe how the metal part of a BIGVIA is expanded (for the hole
part, see the previous table <code class="docutils literal"><span class="pre">MBK_TO_RDS_BIGVIA_HOLE</span></code>). The rule give for each
metal:</p>
<ol class="arabic simple">
<li>The <em>delta-with</em> (have to ask Franck).</li>
<li>The <em>overhang</em>, the length the real rectangle is expanded on each side from
the symbolic rectange.</li>
</ol>
<p>Example:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TABLE</span> <span class="n">MBK_TO_RDS_BIGVIA_METAL</span>
<span class="n">CONT_VIA</span> <span class="n">RDS_ALU1</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU2</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span>
<span class="n">CONT_VIA2</span> <span class="n">RDS_ALU2</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU3</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span>
<span class="n">CONT_VIA3</span> <span class="n">RDS_ALU3</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU4</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span>
<span class="n">CONT_VIA4</span> <span class="n">RDS_ALU4</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU5</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span>
<span class="n">CONT_VIA5</span> <span class="n">RDS_ALU5</span> <span class="mf">0.0</span> <span class="mf">0.09</span> <span class="n">ALL</span> \
<span class="n">RDS_ALU6</span> <span class="mf">0.0</span> <span class="mf">0.18</span> <span class="n">ALL</span>
<span class="n">END</span>
</pre></div>
</div>
</div>
<div class="section" id="the-mbk-wiresetting-table">
<h2>The <code class="docutils literal"><span class="pre">MBK_WIRESETTING</span></code> table<a class="headerlink" href="#the-mbk-wiresetting-table" title="Permalink to this headline"></a></h2>
<p>From a strict standpoint this table shouldn&#8217;t be here but put in a separate
configuration file, because it contains informations only used by the symbolic
layout tools (<code class="docutils literal"><span class="pre">ocp</span></code>, <code class="docutils literal"><span class="pre">nero</span></code>, <code class="docutils literal"><span class="pre">ring</span></code>).</p>
<p>This table defines the cell gauge the routing pitch and minimal (symbolic)
wire width and minimal spacing for the routers. They are patly redundant.</p>
<p>Example:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TABLE</span> <span class="n">MBK_WIRESETTING</span>
<span class="n">X_GRID</span> <span class="mi">10</span>
<span class="n">Y_GRID</span> <span class="mi">10</span>
<span class="n">Y_SLICE</span> <span class="mi">100</span>
<span class="n">WIDTH_VDD</span> <span class="mi">12</span>
<span class="n">WIDTH_VSS</span> <span class="mi">12</span>
<span class="n">TRACK_WIDTH_ALU8</span> <span class="mi">0</span>
<span class="n">TRACK_WIDTH_ALU7</span> <span class="mi">4</span>
<span class="n">TRACK_WIDTH_ALU6</span> <span class="mi">4</span>
<span class="n">TRACK_WIDTH_ALU5</span> <span class="mi">4</span>
<span class="n">TRACK_WIDTH_ALU4</span> <span class="mi">3</span>
<span class="n">TRACK_WIDTH_ALU3</span> <span class="mi">3</span>
<span class="n">TRACK_WIDTH_ALU2</span> <span class="mi">3</span>
<span class="n">TRACK_WIDTH_ALU1</span> <span class="mi">3</span>
<span class="n">TRACK_SPACING_ALU8</span> <span class="mi">0</span>
<span class="n">TRACK_SPACING_ALU7</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU6</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU5</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU4</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU3</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU2</span> <span class="mi">4</span>
<span class="n">TRACK_SPACING_ALU1</span> <span class="mi">3</span>
<span class="n">END</span>
</pre></div>
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