194 lines
6.5 KiB
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194 lines
6.5 KiB
HTML
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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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<TITLE>DpgenFifo</TITLE>
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<H1><A NAME="SECTION000340000000000000000">
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DpgenFifo</A>
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</H1>
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<UL>
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<LI><SPAN CLASS="textbf">Name</SPAN> : DpgenFifo - Fifo Macro-Generator
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</LI>
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<LI><SPAN CLASS="textbf">Synopsys</SPAN> :
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<PRE>
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Generate ( 'DpgenFifo', modelname
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, param = { 'nbit' : n
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, 'nword' : regNumber
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, 'physical' : True
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}
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)
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</PRE>
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</LI>
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<LI><SPAN CLASS="textbf">Description</SPAN> : Generates a FIFO of <code>regNumber</code> words of <code>n</code> bits named <code>modelname</code>.
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</LI>
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<LI><SPAN CLASS="textbf">Terminal Names</SPAN> :
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<UL>
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<LI><SPAN CLASS="textbf">ck</SPAN> : clock signal (input, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">reset</SPAN> : reset signal (input, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">r</SPAN> : read requested (input, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">w</SPAN> : write requested (input, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">rok</SPAN> : read acknowledge (output, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">wok</SPAN> : write acknowledge (output, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">sel</SPAN> : select the write bus (input, 1 bit)
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</LI>
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<LI><SPAN CLASS="textbf">datain0</SPAN> : first write bus (input, <code>n</code> bits)
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</LI>
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<LI><SPAN CLASS="textbf">datain1</SPAN> : second write bus (input, <code>n</code> bits)
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</LI>
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<LI><SPAN CLASS="textbf">dataout</SPAN> : read bus (output, <code>n</code> bits)
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</LI>
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<LI><SPAN CLASS="textbf">vdd</SPAN> : power
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</LI>
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<LI><SPAN CLASS="textbf">vss</SPAN> : ground
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</LI>
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</UL>
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</LI>
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<LI><SPAN CLASS="textbf">Parameters</SPAN> : Parameters are given in the map <code>param</code>.
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<UL>
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<LI><SPAN CLASS="textbf">nbit</SPAN> (mandatory) : Defines the size of the words (even, between 2 and 64)
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</LI>
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<LI><SPAN CLASS="textbf">nword</SPAN> (mandatory) : Defines the number of words (even, between 4 and 32)
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</LI>
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<LI><SPAN CLASS="textbf">physical</SPAN> (optional, default value : False) : In order to generate a layout
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</LI>
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</UL>
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</LI>
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<LI><SPAN CLASS="textbf">How it works</SPAN> :
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<UL>
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<LI>datain0 and datain1 : the two write busses. Only one is used to actually write the FIFO, it is selected by the sel signal.
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</LI>
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<LI>sel : when set to <code>zero</code> the datain0 is used to write the register word, otherwise it will be datain1.
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</LI>
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<LI>r, rok : set r when a word is requested, rok tells that a word has effectively been popped (rok == not empty).
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</LI>
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<LI>w, wok : set w when a word is pushed, wok tells that the word has effectively been pushed (wok == not full).
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</LI>
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</UL>
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</LI>
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<LI><SPAN CLASS="textbf">Example</SPAN> :
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<PRE>
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from stratus import *
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class inst_fifo ( Model ) :
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def Interface ( self ) :
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self.ck = SignalIn ( "ck", 1 )
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self.reset = SignalIn ( "reset", 1 )
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self.r = SignalIn ( "r", 1 )
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self.w = SignalIn ( "w", 1 )
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self.rok = SignalInOut ( "rok", 1 )
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self.wok = SignalInOut ( "wok", 1 )
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self.sel = SignalIn ( "sel", 1 )
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self.datain0 = SignalIn ( "datain0", 4 )
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self.datain1 = SignalIn ( "datain1", 4 )
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self.dataout = SignalOut ( "dataout", 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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Generate ( 'DpgenFifo', 'fifo_4_16'
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, param = { 'nbit' : 4
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, 'nword' : 16
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, 'physical' : True
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}
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)
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self.I = Inst ( 'fifo_4_16', 'inst'
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, map = { 'ck' : self.ck
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, 'reset' : self.reset
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, 'r' : self.r
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, 'w' : self.w
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, 'rok' : self.rok
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, 'wok' : self.wok
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, 'sel' : self.sel
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, 'datain0' : self.datain0
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, 'datain1' : self.datain1
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, 'dataout' : self.dataout
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, 'vdd' : self.vdd
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, 'vss' : self.vss
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}
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)
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def Layout ( self ) :
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Place ( self.I, NOSYM, Ref(0, 0) )
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</PRE>
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</LI>
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</UL>
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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="node33.html">DpgenRf1d</A></td>
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<td class="navigation" align="center" width="34%"><A HREF="dpgen.html">Dpgen generators User's Manual</A></td>
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<td class="navigation" align="right" width="33%"><A HREF="node35.html">DpgenDff</A></td>
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<ADDRESS>
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Sophie B<small>ELLOEIL</small><br>20051116.1
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