282 lines
6.9 KiB
HTML
282 lines
6.9 KiB
HTML
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<!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>Nets</TITLE>
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<META NAME="description" CONTENT="Nets">
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<META NAME="keywords" CONTENT="stratus">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<META NAME="Generator" CONTENT="LaTeX2HTML v2012">
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<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
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<LINK REL="STYLESHEET" HREF="SoC.css">
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<LINK REL="next" HREF="node8.html">
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<LINK REL="previous" HREF="node6.html">
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<LINK REL="up" HREF="node6.html">
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<LINK REL="next" HREF="node8.html">
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</HEAD>
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<BODY >
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<DIV CLASS="navigation">
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<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="node6.html">Description of a netlist</A></td>
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<td class="navigation" align="center" width="34%"><A HREF="node6.html">Description of a netlist</A></td>
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<td class="navigation" align="right" width="33%"><A HREF="node8.html">Instances</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="tex2html189"
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HREF="node7.html#SECTION00031100000000000000">Name</A>
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<LI><A NAME="tex2html190"
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HREF="node7.html#SECTION00031200000000000000">Synopsys</A>
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<LI><A NAME="tex2html191"
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HREF="node7.html#SECTION00031300000000000000">Description</A>
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<LI><A NAME="tex2html192"
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HREF="node7.html#SECTION00031400000000000000">Nets</A>
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<LI><A NAME="tex2html193"
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HREF="node7.html#SECTION00031500000000000000">Parameters</A>
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<LI><A NAME="tex2html194"
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HREF="node7.html#SECTION00031600000000000000">Functions and methods</A>
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<LI><A NAME="tex2html195"
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HREF="node7.html#SECTION00031700000000000000">Example</A>
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<LI><A NAME="tex2html196"
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HREF="node7.html#SECTION00031800000000000000">Errors</A>
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<LI><A NAME="tex2html197"
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HREF="node7.html#SECTION00031900000000000000">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="SECTION00031000000000000000"></A>
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<A NAME="secnet"></A>
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<BR>
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Nets
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</H2>
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<H3><A NAME="SECTION00031100000000000000">
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Name</A>
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</H3>
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<P>
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SignalIn, SignalOut ... - Creation of nets
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<P>
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<H3><A NAME="SECTION00031200000000000000">
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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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netA = SignalIn ( "a", 4 )
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</PRE>
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<P>
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<H3><A NAME="SECTION00031300000000000000">
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Description</A>
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</H3>
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<P>
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How to create and use nets.
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<P>
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<H3><A NAME="SECTION00031400000000000000">
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Nets</A>
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</H3>
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<P>
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Differents kind of nets are listed below :
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<UL>
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<LI><code>SignalIn</code> : Creation of an input port
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</LI>
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<LI><code>SignalOut</code> : Creation of an output port
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</LI>
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<LI><code>SignalInOut</code> : Creation of an inout port
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</LI>
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<LI><code>SignalUnknown</code> : Creation of an input/output port which direction is not defined
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</LI>
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<LI><code>TriState</code> : Creation of a tristate port
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</LI>
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<LI><code>CkIn</code> : Creation of a clock port
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</LI>
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<LI><code>VddIn</code> : Creation of the vdd alimentation
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</LI>
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<LI><code>VssIn</code> : Creation of the vss alimentation
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</LI>
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<LI><code>Signal</code> : Creation of an internal net
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00031500000000000000">
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Parameters</A>
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</H3>
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<P>
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All kind of constructors have the same parameters :
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<UL>
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<LI><code>name</code> : the name of the net (mandatory argument)
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</LI>
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<LI><code>arity</code> : the arity of the net (mandatory argument)
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</LI>
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<LI><code>indice</code> : for bit vectors only : the LSB bit (optional argument : set to 0 by default)
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</LI>
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</UL>
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<P>
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Only <code>CkIn</code>, <code>VddIn</code> and <code>VssIn</code> do not have the same parameters : there is only the <code>name</code> parameter (they are 1 bit nets).
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<P>
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<H3><A NAME="SECTION00031600000000000000">
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Functions and methods</A>
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</H3>
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<P>
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Some functions/methods are provided in order to handle nets :
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<UL>
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<LI>function <code>Cat</code> : Concatenation of nets, beginning with the MSB
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<PRE>
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Inst ( 'DpgenInv'
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, map = { 'i0' : Cat ( A, B )
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, 'nq' : S
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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</PRE>
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Or :
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<PRE>
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tab = []
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tab.append ( A )
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tab.append ( B )
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Inst ( 'DpgenInv'
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, map = { 'i0' : Cat ( tab )
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, 'nq' : S
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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</PRE>
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If A and B are 2 bits nets, the net <code>myNet</code> will be such as :
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<PRE>
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myNet[3] = A[1]
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myNet[2] = A[0]
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myNet[1] = B[1]
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myNet[0] = B[0]
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</PRE>
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</LI>
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<LI>function <code>Extend</code> : Creation of a net which is an extension of the net which it is applied to
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<PRE>
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temp = Signal ( "temp", 5 )
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tempExt = Signal ( "temp_ext", 8 )
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tempExt <= temp.Extand ( 8, 'one' )
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</PRE>
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</LI>
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<LI>method <code>Alias</code> : Creation of an alias name for a net
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<PRE>
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cin.Alias ( c_temp[0] )
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cout.Alias ( c_temp[4] )
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for i in range ( 4 ) :
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Inst ( "Fulladder"
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, map = { 'a' : a[i]
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, 'b' : b[i]
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, 'cin' : c_temp[i]
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, 'sout' : sout[i]
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, 'cout' : c_temp[i+1]
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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</PRE>
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00031700000000000000">
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Example</A>
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</H3>
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<P>
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You can see a concrete example at : <A HREF="node5.html#secexample"><SPAN CLASS="textit">Example</SPAN></A>
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<P>
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<H3><A NAME="SECTION00031800000000000000">
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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>Error in SignalIn :</code>
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<BR><code>the lenght of the net must be a positive value.</code>
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<BR>
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One can not create a net with a negative lenght.
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</LI>
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</UL>
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<P>
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<H3><A NAME="SECTION00031900000000000000">
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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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<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="node6.html">Description of a netlist</A></td>
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<td class="navigation" align="center" width="34%"><A HREF="node6.html">Description of a netlist</A></td>
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<td class="navigation" align="right" width="33%"><A HREF="node8.html">Instances</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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</BODY>
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</HTML>
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