207 lines
5.7 KiB
HTML
207 lines
5.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!--Converted with LaTeX2HTML 2012 (1.2)
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>Boolean operations</TITLE>
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<META NAME="description" CONTENT="Boolean operations">
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<META NAME="keywords" CONTENT="stratus">
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<META NAME="resource-type" CONTENT="document">
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<td class="navigation" align="left" width="33%"><A HREF="node40.html">Constants</A></td>
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<td class="navigation" align="center" width="34%"><A HREF="node35.html">Instanciation facilities</A></td>
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<td class="navigation" align="right" width="33%"><A HREF="node42.html">Arithmetical operations</A></td>
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</tr></table>
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<hr>
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<br>
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</DIV>
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<!--End of Navigation Panel-->
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL CLASS="ChildLinks">
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<LI><A NAME="tex2html954"
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HREF="node41.html#SECTION00076100000000000000">Description</A>
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<LI><A NAME="tex2html955"
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HREF="node41.html#SECTION00076200000000000000">List</A>
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<LI><A NAME="tex2html956"
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HREF="node41.html#SECTION00076300000000000000">Generators to instantiate</A>
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<LI><A NAME="tex2html957"
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HREF="node41.html#SECTION00076400000000000000">Example</A>
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<LI><A NAME="tex2html958"
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HREF="node41.html#SECTION00076500000000000000">Errors</A>
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<LI><A NAME="tex2html959"
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HREF="node41.html#SECTION00076600000000000000">See Also</A>
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</UL>
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<!--End of Table of Child-Links-->
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<HR>
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<H2><A NAME="SECTION00076000000000000000"></A>
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<A NAME="secbool"></A>
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<BR>
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Boolean operations
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</H2>
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<H3><A NAME="SECTION00076100000000000000">
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Description</A>
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</H3>
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<P>
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Most common boolean operators can be instantiated without the <code>Inst</code> constructor.
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<P>
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<H3><A NAME="SECTION00076200000000000000">
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List</A>
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</H3>
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<P>
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Boolean operators are listed below :
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<UL>
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<LI><code>And2</code> : <code>q <= i0 & i1</code>
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</LI>
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<LI><code>Or2</code> : <code>q <= i0 | i1</code>
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</LI>
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<LI><code>Xor2</code> : <code>q <= i0 ^ i1</code>
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</LI>
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<LI><code>Inv</code> : <code>q <= ~i0</code>
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00076300000000000000">
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Generators to instantiate</A>
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</H3>
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<P>
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One can choose the generator to be used. Some methods are applied to the cell and set the generator used when using <code>&</code>, <code>|</code>, <code>^</code> and <code>~</code>. The generators used by default are the ones from the virtual library.
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<BR>
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<P>
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Methods are :
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<UL>
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<LI><code>SetAnd</code>
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</LI>
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<LI><code>SetOr</code>
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</LI>
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<LI><code>SetXor</code>
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</LI>
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<LI><code>SetNot</code>
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00076400000000000000">
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Example</A>
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</H3>
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<P>
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<PRE>
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class essai ( Model ) :
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def Interface ( self ) :
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self.A = SignalIn ( "a", 4 )
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self.B = SignalIn ( "b", 4 )
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self.B = SignalIn ( "c", 4 )
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self.S = SignalOut ( "s", 4 )
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self.vdd = VddIn ( "vdd" )
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self.vss = VssIn ( "vss" )
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def Netlist ( self ) :
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self.S <= ( ~self.A & self.B ) | self.C
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</PRE>
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<P>
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<H3><A NAME="SECTION00076500000000000000">
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Errors</A>
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</H3>
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<P>
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Some errors may occur :
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<UL>
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<LI><code>[Stratus ERROR] & : the nets must have the same lenght.</code>
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<BR>
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When one uses boolean expressions, one has to check that the sizes of both nets are equivalent.
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</LI>
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<LI><code>[Stratus ERROR] : there is no alim.</code>
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<BR>
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The cell being created does not have the alimentation nets. The instanciation is impossible.
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00076600000000000000">
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See Also</A>
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</H3>
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<P>
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<A HREF="node3.html#secintroduction"><SPAN CLASS="textit">Introduction</SPAN></A>
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<A HREF="node6.html#secnetlist"><SPAN CLASS="textit">Netlist</SPAN></A>
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<A HREF="node37.html#secmux"><SPAN CLASS="textit">Instanciation of a multiplexor</SPAN></A>
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<A HREF="node38.html#secshift"><SPAN CLASS="textit">Instanciation of a shifter</SPAN></A>
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<A HREF="node39.html#secreg"><SPAN CLASS="textit">Instanciation of a register</SPAN></A>
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<A HREF="node40.html#secconstant"><SPAN CLASS="textit">Instanciation of constants</SPAN></A>
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<A HREF="node42.html#secarithmetic"><SPAN CLASS="textit">Arithmetical operations</SPAN></A>
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<A HREF="node43.html#seccomp"><SPAN CLASS="textit">Comparison operations</SPAN></A>
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<P>
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<DIV CLASS="navigation">
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<p>
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<hr><table align="center" width="100%" cellpadding="0" cellspacing="2">
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<tr><td class="navigation" align="left" width="33%"><B>Previous</B></td>
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<td class="navigation" align="center" width="34%"><B>Up</B></td>
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<td class="navigation" align="right" width="33%"><B>Next</B></td>
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</tr><tr>
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<td class="navigation" align="left" width="33%"><A HREF="node40.html">Constants</A></td>
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<td class="navigation" align="center" width="34%"><A HREF="node35.html">Instanciation facilities</A></td>
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<td class="navigation" align="right" width="33%"><A HREF="node42.html">Arithmetical operations</A></td>
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</tr></table>
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<hr>
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</DIV>
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<!--End of Navigation Panel-->
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<ADDRESS>
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Sophie B<small>ELLOEIL</small><br>20051116.1
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</ADDRESS>
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