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1 135 jt_eaton 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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  <meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8">
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  <title>start</title>
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  <meta name="GENERATOR" content="OpenOffice.org 3.0  (Linux)">
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  <meta name="CREATED" content="0;0">
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  <meta name="CHANGED" content="20090513;8521600">
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  <meta name="KEYWORDS" content="start">
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  <meta name="Info 3" content="">
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  <meta name="Info 4" content="">
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  <meta name="date" content="2008-01-08T12:01:41-0500">
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  <meta name="robots" content="index,follow">
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</head>
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<body dir="ltr" lang="en-US">
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<h1><a name="ps2_interface"></a>SOCGEN <br>
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</h1>
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<h1>&nbsp; Datasheet: <br>
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</h1>
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<div id="toc__inside" dir="ltr">
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<ul>
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  <li>
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    <p style="margin-bottom: 0in;"><a href="#ps2_interface">ps2_interface<br>
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    </a></p>
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    <ul>
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      <li>
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        <p style="margin-bottom: 0in;"><a href="#Description">Description<br>
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        </a></p>
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      </li>
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      <li>
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        <p style="margin-bottom: 0in;"><a href="#Parameters">Parameters<br>
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        </a></p>
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      </li>
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      <li>
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        <p style="margin-bottom: 0in;"><a href="#Interface">Interface<br>
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        </a></p>
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      </li>
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      <li>
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        <p style="margin-bottom: 0in;"><a href="#Theoryofoperation">Theory
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of Operation<br>
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        </a></p>
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      </li>
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      <li>
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        <p><a href="../../../../../../socgen_cmp/projects/logic/ip/ps2_interface/rtl/gen/syn/ps2_interface.v">Source Code <br>
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        </a></p>
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      </li>
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    </ul>
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  </li>
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</ul>
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</div>
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<h1><br>
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</h1>
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<br>
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<img style="width: 640px; height: 480px;" alt=""
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 src="./png/ps2_interface.png"><br>
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<b><br>
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<br>
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</b>
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<h2><b><a name="Description"></a>Description</b></h2>
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Interface for an PS2 compatible keyboard/mouse<br>
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<br>
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<br>
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<br>
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<h2><b><a name="Parameters"></a>Parameters<br>
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</b></h2>
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<table style="text-align: left; width: 500px; height: 120px;" border="8"
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 cellpadding="4" cellspacing="4">
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  <tbody>
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    <tr>
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      <td style="vertical-align: top;">Name<br>
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      </td>
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      <td style="vertical-align: top;">default <br>
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      </td>
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      <td style="vertical-align: top;">Description<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;">FREQ<br>
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      </td>
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      <td style="vertical-align: top;">24<br>
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      </td>
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      <td style="vertical-align: top;">clk frequency in Megahertz<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;">CLK_HOLD_DELAY<br>
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      </td>
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      <td style="vertical-align: top;">100<br>
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      </td>
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      <td style="vertical-align: top;"># of microseconds to hold ps2_clk before host -> device transfer<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;">DATA_SETUP_DELAY<br>
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      </td>
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      <td style="vertical-align: top;">20<br>
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      </td>
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      <td style="vertical-align: top;"># of microseconds to hold data startbit for host -> device transfer<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;">DEBOUNCE_DELAY<br>
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      </td>
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      <td style="vertical-align: top;">4'b1111<br>
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      </td>
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      <td style="vertical-align: top;"># of clk's to wait for debounce of ps2_clk and ps2_data<br>
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      </td>
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    </tr>
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  </tbody>
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</table>
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<b><br>
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<br>
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</b>
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<p><b><b><br>
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</b></b></p>
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<p><b><b><br>
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</b></b></p>
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<p><br>
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</p>
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<p><b><b><br>
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</b></b></p>
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<p><b><b><br>
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<br>
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</b></b></p>
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<h2><b><b><a name="Interface"></a>Interface</b><b>&nbsp;<br>
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</b></b></h2>
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<p style="margin-bottom: 0in;"></p>
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<table style="text-align: left; width: 366px; height: 152px;" border="8"
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 cellpadding="4" cellspacing="4">
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  <tbody>
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    <tr>
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      <td style="vertical-align: top;">NAME<br>
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      </td>
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      <td style="vertical-align: top;">Type<br>
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      </td>
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      <td style="vertical-align: top;"><br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> clk<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> system clk<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> reset<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> system reset<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> ps2_clk_pad_oe<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> control for clk pad<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> ps2_clk_pad_in<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> ps2_clk pad value<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> ps2_data_pad_oe<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> control for data pad<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> ps2_data_pad_in<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> ps2_data pad value<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> busy<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> interface is receiving a byte<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> tx_data[7:0]<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> data byte to be sent<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> tx_write<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> start sending data<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_data[7:0]<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> received data byte<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_read<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> received data strobe<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_full<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> byte has been received<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_parity_error<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> byte received with wrong parity bit<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_parity_rcv<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> parity bit received<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_parity_cal<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> calculated parity bit<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_frame_error<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> byte received with no stop bit<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> rx_clear<br>
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      </td>
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      <td style="vertical-align: top;"> input<br>
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      </td>
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      <td style="vertical-align: top;"> clear rx_full and errors<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> tx_buffer_empty<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> ready to send new byte<br>
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      </td>
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    </tr>
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    <tr>
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      <td style="vertical-align: top;"> tx_ack_error<br>
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      </td>
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      <td style="vertical-align: top;"> output<br>
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      </td>
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      <td style="vertical-align: top;"> device did not acknowledge last byte sent<br>
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      </td>
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    </tr>
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  </tbody>
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</table>
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<h2><b><a name="Theoryofoperation"></a>Theory of Operation<br>
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</b></h2>
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Add description of how it works<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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</body>
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</html>

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