235 lines
6.0 KiB
HTML
235 lines
6.0 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>Constants</TITLE>
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<META NAME="description" CONTENT="Constants">
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<META NAME="keywords" CONTENT="stratus">
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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="tex2html937"
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HREF="node40.html#SECTION00075100000000000000">Name</A>
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<LI><A NAME="tex2html938"
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HREF="node40.html#SECTION00075200000000000000">Synopsys</A>
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<LI><A NAME="tex2html939"
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HREF="node40.html#SECTION00075300000000000000">Description</A>
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<LI><A NAME="tex2html940"
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HREF="node40.html#SECTION00075400000000000000">Parameters</A>
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<LI><A NAME="tex2html941"
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HREF="node40.html#SECTION00075500000000000000">Example</A>
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<LI><A NAME="tex2html942"
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HREF="node40.html#SECTION00075600000000000000">Errors</A>
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<LI><A NAME="tex2html943"
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HREF="node40.html#SECTION00075700000000000000">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="SECTION00075000000000000000"></A>
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<A NAME="secconstant"></A>
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<BR>
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Constants
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</H2>
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<H3><A NAME="SECTION00075100000000000000">
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Name</A>
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</H3>
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<P>
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Constant - Easy way to instantiate constants
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<P>
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<H3><A NAME="SECTION00075200000000000000">
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Synopsys</A>
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</H3>
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<P>
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<PRE>
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netOne <= One ( 2 )
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net8 <= "8"
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</PRE>
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<P>
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<H3><A NAME="SECTION00075300000000000000">
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Description</A>
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</H3>
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<P>
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These functions simplify the way to instanciate constants.
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<UL>
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<LI>The functions <code>One</code> and<code>Zero</code> permits to initialise all the bits of a net to 'one' or 'zero'.
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</LI>
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<LI>The instanciation of a constant thanks to a string can be done in decimal, hecadecimal or binary.
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00075400000000000000">
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Parameters</A>
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</H3>
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<P>
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<UL>
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<LI>For <code>One</code> and <code>Zero</code> :
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<UL>
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<LI><code>n</code> : the arity of the net
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</LI>
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</UL>
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</LI>
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<LI>For the instanciation of a constant :
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<UL>
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<LI>the constant given must be a string representing :
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<UL>
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<LI>A decimal number
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</LI>
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<LI>A binary number : the string must begin with "0b"
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</LI>
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<LI>An hexadecimal number : the string must begin with "0x"
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</LI>
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</UL>
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</LI>
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</UL>
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00075500000000000000">
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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.Ones = SignalOut ( "ones", 2 )
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self.Zeros = SignalOut ( "zeros", 4 )
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self.Eight = SignalOut ( "eight", 4 )
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self.Twentu = SignalOut ( "twenty", 5 )
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self.Two = SignalOut ( "two", 5 )
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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.Ones <= One ( 2 )
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self.Zero <= Zero ( 4 )
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self.Eight <= "8"
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self.Twenty <= "0x14"
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self.Two <= "0b10"
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</PRE>
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<P>
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<H3><A NAME="SECTION00075600000000000000">
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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] Const :</code>
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<BR><code>the argument must be a string representing a number in decimal,</code>
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<BR><code>binary (0b) or hexa (0x).</code>
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<BR>
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The string given as argument does not have the right form.
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00075700000000000000">
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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="node41.html#secbool"><SPAN CLASS="textit">Boolean operations</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="node39.html">Register</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="node41.html">Boolean operations</A></td>
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</tr></table>
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<hr>
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</DIV>
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<ADDRESS>
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Sophie B<small>ELLOEIL</small><br>20051116.1
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