<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Lava/SequentialCircuits.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>SequentialCircuits</span> <span class='hs-keyword'>where</span> <a name="line-2"></a> <a name="line-3"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span> <a name="line-4"></a> <a name="line-5"></a><span class='hs-comment'>----------------------------------------------------------------</span> <a name="line-6"></a><span class='hs-comment'>-- Sequential Circuits</span> <a name="line-7"></a> <a name="line-8"></a><a name="edge"></a><span class='hs-definition'>edge</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>change</span> <a name="line-9"></a> <span class='hs-keyword'>where</span> <a name="line-10"></a> <span class='hs-varid'>inp'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>low</span> <span class='hs-varid'>inp</span> <a name="line-11"></a> <span class='hs-varid'>change</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xor2</span> <span class='hs-layout'>(</span><span class='hs-varid'>inp</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp'</span><span class='hs-layout'>)</span> <a name="line-12"></a> <a name="line-13"></a><a name="toggle"></a><span class='hs-definition'>toggle</span> <span class='hs-varid'>change</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-14"></a> <span class='hs-keyword'>where</span> <a name="line-15"></a> <span class='hs-varid'>out'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>low</span> <span class='hs-varid'>out</span> <a name="line-16"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xor2</span> <span class='hs-layout'>(</span><span class='hs-varid'>change</span><span class='hs-layout'>,</span> <span class='hs-varid'>out'</span><span class='hs-layout'>)</span> <a name="line-17"></a> <a name="line-18"></a><a name="delayClk"></a><span class='hs-definition'>delayClk</span> <span class='hs-varid'>init</span> <span class='hs-layout'>(</span><span class='hs-varid'>clk</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-19"></a> <span class='hs-keyword'>where</span> <a name="line-20"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>init</span> <span class='hs-varid'>val</span> <a name="line-21"></a> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mux</span> <span class='hs-layout'>(</span><span class='hs-varid'>clk</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>out</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-22"></a> <a name="line-23"></a><a name="delayN"></a><span class='hs-definition'>delayN</span> <span class='hs-num'>0</span> <span class='hs-varid'>init</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>inp</span> <a name="line-24"></a><span class='hs-definition'>delayN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>init</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-25"></a> <span class='hs-keyword'>where</span> <a name="line-26"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>init</span> <span class='hs-varid'>rest</span> <a name="line-27"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delayN</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>init</span> <span class='hs-varid'>inp</span> <a name="line-28"></a> <a name="line-29"></a><a name="always"></a><span class='hs-definition'>always</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ok</span> <a name="line-30"></a> <span class='hs-keyword'>where</span> <a name="line-31"></a> <span class='hs-varid'>sofar</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>high</span> <span class='hs-varid'>ok</span> <a name="line-32"></a> <span class='hs-varid'>ok</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>and2</span> <span class='hs-layout'>(</span><span class='hs-varid'>inp</span><span class='hs-layout'>,</span> <span class='hs-varid'>sofar</span><span class='hs-layout'>)</span> <a name="line-33"></a> <a name="line-34"></a><a name="constant"></a><span class='hs-definition'>constant</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ok</span> <a name="line-35"></a> <span class='hs-keyword'>where</span> <a name="line-36"></a> <span class='hs-varid'>init</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>high</span> <span class='hs-varid'>low</span> <a name="line-37"></a> <span class='hs-varid'>same</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'><==></span> <span class='hs-varid'>delay</span> <span class='hs-varid'>zero</span> <span class='hs-varid'>x</span> <a name="line-38"></a> <span class='hs-varid'>ok</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>always</span> <span class='hs-layout'>(</span><span class='hs-varid'>init</span> <span class='hs-varop'><|></span> <span class='hs-varid'>same</span><span class='hs-layout'>)</span> <a name="line-39"></a> <a name="line-40"></a><a name="puls"></a><span class='hs-definition'>puls</span> <span class='hs-varid'>n</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-41"></a> <span class='hs-keyword'>where</span> <a name="line-42"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delayN</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>low</span> <span class='hs-varid'>last</span> <a name="line-43"></a> <span class='hs-varid'>last</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>high</span> <span class='hs-varid'>out</span> <a name="line-44"></a> <a name="line-45"></a><a name="outputList"></a><span class='hs-definition'>outputList</span> <span class='hs-varid'>sigs</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-46"></a> <span class='hs-keyword'>where</span> <a name="line-47"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>|-></span><span class='hs-layout'>)</span> <span class='hs-varid'>out</span> <span class='hs-varid'>sigs</span> <a name="line-48"></a> <a name="line-49"></a><a name="rowSeq"></a><span class='hs-definition'>rowSeq</span> <span class='hs-varid'>circ</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-50"></a> <span class='hs-keyword'>where</span> <a name="line-51"></a> <span class='hs-varid'>carryIn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>zero</span> <span class='hs-varid'>carryOut</span> <a name="line-52"></a> <span class='hs-layout'>(</span><span class='hs-varid'>out</span><span class='hs-layout'>,</span> <span class='hs-varid'>carryOut</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>circ</span> <span class='hs-layout'>(</span><span class='hs-varid'>carryIn</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span> <a name="line-53"></a> <a name="line-54"></a><a name="rowSeqReset"></a><span class='hs-definition'>rowSeqReset</span> <span class='hs-varid'>circ</span> <span class='hs-layout'>(</span><span class='hs-varid'>reset</span><span class='hs-layout'>,</span><span class='hs-varid'>inp</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-55"></a> <span class='hs-keyword'>where</span> <a name="line-56"></a> <span class='hs-varid'>carryIn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>zero</span> <span class='hs-varid'>carry</span> <a name="line-57"></a> <span class='hs-varid'>carry</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mux</span> <span class='hs-layout'>(</span><span class='hs-varid'>reset</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>carryOut</span><span class='hs-layout'>,</span> <span class='hs-varid'>zero</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-58"></a> <span class='hs-layout'>(</span><span class='hs-varid'>out</span><span class='hs-layout'>,</span> <span class='hs-varid'>carryOut</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>circ</span> <span class='hs-layout'>(</span><span class='hs-varid'>carryIn</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span> <a name="line-59"></a> <a name="line-60"></a><a name="rowSeqPeriod"></a><span class='hs-definition'>rowSeqPeriod</span> <span class='hs-varid'>n</span> <span class='hs-varid'>circ</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span> <a name="line-61"></a> <span class='hs-keyword'>where</span> <a name="line-62"></a> <span class='hs-varid'>reset</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>puls</span> <span class='hs-varid'>n</span> <span class='hs-conid'>()</span> <a name="line-63"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rowSeqReset</span> <span class='hs-varid'>circ</span> <span class='hs-layout'>(</span><span class='hs-varid'>reset</span><span class='hs-layout'>,</span> <span class='hs-varid'>inp</span><span class='hs-layout'>)</span> <a name="line-64"></a> <a name="line-65"></a><span class='hs-comment'>----------------------------------------------------------------</span> <a name="line-66"></a><span class='hs-comment'>-- the end.</span> <a name="line-67"></a> <a name="line-68"></a> </pre></body> </html>
