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<h1 class="header-title text-uppercase">Stratus : Simulation Patterns</h1>
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<p>Printable version of this document <a class="reference external" href="../../../pdf/main/Stratus.pdf">Stratus.pdf</a>.</p>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#description" id="id8">Description</a></li>
<li><a class="reference internal" href="#syntax" id="id9">Syntax</a></li>
<li><a class="reference internal" href="#methods" id="id10">Methods</a></li>
<li><a class="reference internal" href="#example" id="id11">Example</a></li>
</ul>
</div>
<div class="section" id="description">
<h2><a class="toc-backref" href="#id8">Description</a></h2>
<p>The patterns module of <em>Stratus</em> is a set of <em>Python</em> classes and
methods that allows a procedural description of input pattern file for
the logic simulator. The <em>Stratus</em> <tt class="docutils literal">Pattern</tt> method produces a pattern
description file as output. The file generated by <tt class="docutils literal">Pattern</tt> method is
in pat format, so IT IS STRONGLY RECOMMENDED TO SEE pat(5) manual BEFORE
TO USE IT.</p>
</div>
<div class="section" id="syntax">
<h2><a class="toc-backref" href="#id9">Syntax</a></h2>
<p>From a user point of view, <tt class="docutils literal">Pattern</tt> method is a pattern description
language using all standard <em>Python</em> facilities. Here follows the
description of the <tt class="docutils literal">Pattern</tt> method.
A pat format file can be divided in two parts : declaration and
description part.
The declaration part is the list of inputs, outputs, internal signals
and registers. Inputs are to be forced to a certain value and all the
others are to be observed during simulation.
The description part is a set of patterns, where each pattern defines
the value of inputs and outputs. The pattern number represents actually
the absolute time for the simulator.
Similarly, a <tt class="docutils literal">Pattern</tt> method can be divided in two parts :
declaration and description part. Methods related to the declaration
must be called before any function related to the description part.</p>
<div class="section" id="declaration-part">
<h3>Declaration part</h3>
<p>The first thing you should do in this part is to instantiate the class
<tt class="docutils literal">Patwrite</tt> to have access to all patterns declaration and description
methods. The constructor of this class take as parameters the name of
pattern output file and the <em>Stratus</em> cell that is described (see
<tt class="docutils literal">PatWrite</tt> [patwrite]).
Then, this part allows you to declare the inputs, the outputs, and
internal observing points (see <tt class="docutils literal">declar</tt>[declar] and
<tt class="docutils literal">declar_interface</tt> [declar:sub:<cite>i</cite>nterface]).</p>
</div>
<div class="section" id="description-part">
<h3>Description part</h3>
<p>After all signals are declared, you can begin the description part (see
<tt class="docutils literal">pattern_begin</tt> [pattern:sub:<cite>b</cite>egin]). In this part you have to
define input values which are to be applied to the inputs of the circuit
or output values which are to be compare with the values produced during
the simulation. (see <tt class="docutils literal">affect</tt> [affect], <tt class="docutils literal">affect_any</tt>
[affect:sub:<cite>a</cite>ny], <tt class="docutils literal">affect_int</tt> [affect:sub:<cite>i</cite>nt] and
<tt class="docutils literal">affect_fix</tt> [affect:sub:<cite>f</cite>ix]). <tt class="docutils literal">Pattern</tt> method describes the
stimulus by event : only signal transitions are described. After each
event there is a new input in the pattern file (see <tt class="docutils literal">addpat</tt>
[addpat]). Last thing you should do in this part is to generate the
output file (see <tt class="docutils literal">pattern_end</tt> [pattern:sub:<cite>e</cite>nd]).</p>
</div>
</div>
<div class="section" id="methods">
<h2><a class="toc-backref" href="#id10">Methods</a></h2>
<div class="section" id="patwrite">
<h3>PatWrite</h3>
<p>This class is used to create patterns for <em>Stratus</em> models. Currently it
only supports Alliance “.pat” pattern format. Patterns time stamps are
in the “absolute date” format, “relative date” isn’t allowed. Legal time
unit are ps (default), ns, us and ms. The constructor takes as
parameters the pattern output filename and an optional reference to
Stratus cell.</p>
</div>
<div class="section" id="declar">
<h3>declar</h3>
<p>Adds a connector from a Stratus model to the pattern interface. Writes
the corresponding connector declaration in the pattern file with name,
arity and direction automatically extracted from the connector
properties.
Supported Stratus connectors are:</p>
<ul class="simple">
<li>SignalIn,</li>
<li>SignalOut (only supported if used as an output),</li>
<li>VddIn,</li>
<li>VssIn,</li>
<li>CkIn,</li>
<li>SignalInOut,</li>
<li>TriState (always an output),</li>
<li>Signals.</li>
</ul>
<div class="section" id="parameters">
<h4>Parameters</h4>
<ul class="simple">
<li>connector : can either be a reference to a stratus net or a string
containing the name of the stratus net.</li>
<li>format : optional format for the connectors values into the pattern
file, accepted values are :<ul>
<li>’B’: binary (default),</li>
<li>’X’: hexadecimal,</li>
<li>’O’: octal.</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="section" id="declar-interface">
<h3>declar_interface</h3>
<p>Adds all the connectors from a Stratus model to the pattern interface.
Write the corresponding connector declaration in the pattern file with
name, arity and direction directly taken from the connector proprieties.</p>
<div class="section" id="id2">
<h4>Parameters</h4>
<ul class="simple">
<li>cell : the tested Stratus model reference. Optional if a reference to
the tested Stratus model was given during instanciation[patwrite].</li>
<li>format : optional format for the connectors values into the pattern
file, accepted values are :<ul>
<li>’B’: binary (default),</li>
<li>’X’: hexadecimal,</li>
<li>’O’: octal.</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="section" id="id3">
<h3>declar</h3>
<p>Affect a string value to a connector.</p>
<div class="section" id="id4">
<h4>Parameters</h4>
<ul class="simple">
<li>connector : <em>Stratus</em> connector</li>
<li>value : string to affect to connector</li>
</ul>
</div>
</div>
<div class="section" id="affect-int">
<h3>affect_int</h3>
<p>Affect an integer (CA2) value to a connector. Convert the 2’s complement
value to the corresponding binary value. The binary size is taken from
the connector arity. If the connector is an output, the binary value is
preceded by “?”.</p>
<div class="section" id="id5">
<h4>Parameters</h4>
<ul class="simple">
<li>connector : <em>Stratus</em> connector.</li>
<li>value : 2’s complement value to affect to the connector.</li>
</ul>
</div>
</div>
<div class="section" id="affect-fix">
<h3>affect_fix</h3>
<p>Affect a fixed point value to a connector. Convert the floating point
input value to the corresponding fixed point value with
word_length=connector.arity() and integer_word_length=iwl. If the
connector is an output, the binary value is preceded by “?”.</p>
<div class="section" id="id6">
<h4>Parameters</h4>
<ul class="simple">
<li>connector : <em>Stratus</em> connector.</li>
<li>value : floating point value to convert and asign to connector.</li>
<li>iwl : integer word length</li>
</ul>
</div>
</div>
<div class="section" id="affect-any">
<h3>affect_any</h3>
<p>Disable comparison between this connector value and the one calculated
during simulation.</p>
<div class="section" id="id7">
<h4>Parameters</h4>
<ul class="simple">
<li>connector : <em>Stratus</em> connector.</li>
</ul>
</div>
</div>
<div class="section" id="addpat">
<h3>addpat</h3>
<p>Adds a pattern in the pattern file.</p>
</div>
<div class="section" id="pattern-begin">
<h3>pattern_begin</h3>
<p>Mark the end of the interface declaration and the beginning of the test
vectors.</p>
</div>
<div class="section" id="pattern-end">
<h3>pattern_end</h3>
<p>Mark the end of the test vectors and of the patterns file.</p>
</div>
</div>
<div class="section" id="example">
<h2><a class="toc-backref" href="#id11">Example</a></h2>
<p><tt class="docutils literal">Pattern</tt> method for an addaccu</p>
<pre class="literal-block">
def Pattern(self):
# initialisation
pat = PatWrite(self._name+'.pat',self)
# declaration of ports
pat.declar(self.ck, 'B')
pat.declar(self.load, 'B')
pat.declar(self.input, 'X')
pat.declar(self.output, 'X')
pat.declar(self.vdd, 'B')
pat.declar(self.vss, 'B')
# use of pat.declar_interface(self) has the same effect
# description beginning
pat.pattern_begin()
# affect vdd and vss values
pat.affect_int(self.vdd,1)
pat.affect_int(self.vss,0)
# first pattern : load an initial value
pat.affect_int(self.input,5)
pat.affect_int(self.load,1)
pat.affect_int(self.ck,0)
# add the pattern in the pattern file
pat.addpat()
# compute next event
pat.affect_int(self.ck,1)
pat.addpat()
# compute 22 cycle of accumulation
pat.affect_int(self.load,0)
for i in range(1,22):
pat.affect_int(self.ck,0)
pat.addpat()
pat.affect_int(self.ck,1)
pat.affect_int(self.output,i+5)
pat.addpat()
# end of the description
pat.pattern_end()
</pre>
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