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<meta name="date" content="2008-01-08T12:01:41-0500">
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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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<body dir="ltr" lang="en-US">
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<body dir="ltr" lang="en-US">
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<h1><a name="Datasheet"></a>SOCGEN Datasheet:<br>
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<h1><a name="cde_reset_def"></a>SOCGEN Datasheet:<br>
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</h1>
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<div id="toc__inside" dir="ltr">
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<div id="toc__inside" dir="ltr">
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<ul>
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<ul>
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<p style="margin-bottom: 0in;"><a href="#cde_reset_def">cde_reset_def<br>
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</a></p>
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<li>
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<p><a href="../src/cde_reset_def.v">SourceCode <br>
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</a></p>
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<p style="margin-bottom: 0in;"><a href="#Parameters">Parameters<br>
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</a></p>
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<p style="margin-bottom: 0in;"><a href="#Interface">Interface<br>
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</a></p>
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<p style="margin-bottom: 0in;"><a href="#Description">Description<br>
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<p style="margin-bottom: 0in;"><a href="#Children">Children<br>
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</li>
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<p style="margin-bottom: 0in;"><a href="#TheoryofOperation">Theory of Operation<br>
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<p><a href="../../html/cde_reset_def.html#TheoryofOperation">Theory of Operation<br>
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<img style="width: 579.75px; height: 206px;" alt="" src="../png/cde_reset_def_sym.png"><br>
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<b><br>
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<h2><b><a name="Parameters"></a>Parameters<br></b></h2>
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<b><br>
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<table style="text-align: left; width: 640px; height: 120px;" border="8" cellpadding="4" cellspacing="4">
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<td style="vertical-align: top;">Name<br> </td>
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<td style="vertical-align: top;">default <br> </td>
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<td style="vertical-align: top;">Description<br></td>
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<td style="vertical-align: top;">DEPTH<br> </td>
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<td style="vertical-align: top;">1<br> </td>
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<td style="vertical-align: top;">WIDTH<br> </td>
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<td style="vertical-align: top;">1<br> </td>
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<h2><b><b><a name="Interface"></a>Interface</b><b> <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: 640px; height: 120px;" border="8"
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cellpadding="4" cellspacing="4">
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<td style="vertical-align: top;">NAME<br> </td>
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<td style="vertical-align: top;">Type<br> </td>
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<td style="vertical-align: top;">Description<br> </td>
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<td style="vertical-align: top;">async_reset_n<br> </td>
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<td style="vertical-align: top;">input<br> </td>
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<td style="vertical-align: top;">atg_asyncdisable<br> </td>
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<td style="vertical-align: top;">input<br> </td>
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<td style="vertical-align: top;">clk<br> </td>
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<td style="vertical-align: top;">input<br> </td>
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<td style="vertical-align: top;">sync_reset[WIDTH-1:0]<br> </td>
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<td style="vertical-align: top;">input<br> </td>
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<td style="vertical-align: top;">reset_n_out[WIDTH-1:0]<br> </td>
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<td style="vertical-align: top;">output<br> </td>
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<td style="vertical-align: top;">reset_out[WIDTH-1:0]<br> </td>
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<td style="vertical-align: top;">output<br> </td>
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<p><b><b><br>
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</b></b></p>
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<h2><b><a name="Children"></a>Children<br></b></h2>
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<b><br>
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</b>
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<table style="text-align: left; width: 640px; height: 120px;" border="8" cellpadding="4" cellspacing="4">
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<tbody>
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<td style="vertical-align: top;">Instance<br> </td>
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<td style="vertical-align: top;">Vendor<br> </td>
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<td style="vertical-align: top;">Library<br></td>
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<td style="vertical-align: top;">Component<br></td>
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<td style="vertical-align: top;">Version<br></td>
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</tr>
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<tr>
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<td style="vertical-align: top;">U1<br> </td>
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<td style="vertical-align: top;">opencores.org<br> </td>
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<td style="vertical-align: top;">cde<br></td>
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<td style="vertical-align: top;">sync<br></td>
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<td style="vertical-align: top;">with_reset<br></td>
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<td style="vertical-align: top;">U2<br> </td>
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<td style="vertical-align: top;">opencores.org<br> </td>
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<td style="vertical-align: top;">cde<br></td>
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<td style="vertical-align: top;">reset<br></td>
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<td style="vertical-align: top;">asyncdisable<br></td>
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</tbody>
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</table>
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<p><b><b><br>
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</b></b></p>
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<img style="width: 579.75px; height: 206px;" alt="" src="../png/cde_reset_def_sch.png"><br>
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<h2><b><a name="Description"></a>Description</b></h2>
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This module provides a means to expand and resynchronise a reset signal. It is the basic building block for a synchronous reset distribution tree
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<h2><b><a name="TheoryofOperation"></a>Theory of Operation<br></b></h2>
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This module is the building block used to build a synchronous reset distribution tree. It provides a means to resync local resets and combine them with a syst
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em wide reset. Each reset consists of a pair of signals. One is the active low reset_n that can drive the asynchronous reset port of a flipflip and the other
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is the active high reset that can drive anything BUT the asynchronous reset port of a flipflop.
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The local synchronous reset(s) are resynced to ensure that everything is glitchfree. If they are sourced from an asynchronous clock domain then at least two s
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tages of resync logic must be provided to prevent metastability issues.
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