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  <div class="page">
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    <!-- wikipage start -->
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    <div class="toc">
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<div class="tocheader toctoggle" id="toc__header"><img alt="-" src="rgen_doc_files/arrow_up.gif" id="toc__hide"><img style="display: none;" alt="+" src="rgen_doc_files/arrow_down.gif" id="toc__show">Table of Contents</div>
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<div id="toc__inside">
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<ul class="toc">
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<li class="level1"><div class="li"><span class="li"><a href="#rgen_register_file_and_decoder_generator" class="toc">rgen Register File and Decoder Generator</a></span></div></li>
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<li class="level1"><div class="li"><span class="li"><a href="#register_file_generator" class="toc">Register File Generator</a></span></div>
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<ul class="toc">
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<li class="level2"><div class="li"><span class="li"><a href="#tag_definitions" class="toc">Tag Definitions</a></span></div>
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<ul class="toc">
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<li class="level3"><div class="li"><span class="li"><a href="#config" class="toc">config</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#status" class="toc">status</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#count" class="toc">count</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#int_msk" class="toc">int_msk</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#soft_set" class="toc">soft_set</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#write_stb" class="toc">write_stb</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#read_stb" class="toc">read_stb</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#ext_load" class="toc">ext_load</a></span></div></li>
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<li class="level3"><div class="li"><span class="li"><a href="#user" class="toc">user</a></span></div></li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="level1"><div class="li"><span class="li"><a href="#decoder_generator" class="toc">Decoder Generator</a></span></div></li></ul>
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</div>
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</div>
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<h1><a name="rgen_register_file_and_decoder_generator" id="rgen_register_file_and_decoder_generator">rgen Register File and Decoder Generator</a></h1>
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<div class="level1">
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<p> rgen is a Python script for generating a hierarchical set of
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register files and address decoders. It supports a variety of register
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types and multiple levels of address decoding hieararchy.
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</p>
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</div>
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<h1><a name="register_file_generator" id="register_file_generator">Register File Generator</a></h1>
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<div class="level1">
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</div>
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<div class="secedit"><form class="button" method="post" action="/dokuwiki/doku.php"><div class="no"><input name="do" value="edit" type="hidden"><input name="lines" value="249-286" type="hidden"><input name="rev" value="1298592735" type="hidden"><input name="id" value="rgen.py" type="hidden"><input value="Edit" class="button" title="Register File Generator" type="submit"></div></form></div>
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<h2><a name="tag_definitions" id="tag_definitions">Tag Definitions</a></h2>
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<div class="level2">
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<table class="inline">
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        <tbody><tr>
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                <th>tag name</th><th>attributes</th><th>description</th>
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        </tr>
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        <tr>
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                <td>tv_registers</td><td>name,addr_sz,data_sz,base_addr,registered_read</td><td>top-level tag for a register file</td>
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        </tr>
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        <tr>
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                <td>register</td><td>name,type,width,default</td><td>tag for a single logical register</td>
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        </tr>
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        <tr>
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                <td>field</td><td>name,width,default</td><td>tag for a bit field within a single register</td>
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        </tr>
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</tbody></table>
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<table class="inline">
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        <tbody><tr>
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                <th>register type</th><th>Access</th><th>description</th>
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        </tr>
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        <tr>
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                <td><a href="#config" title="rgen.py ↵" class="wikilink1">config</a></td><td>RW</td><td>General read-write configuration register</td>
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        </tr>
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        <tr>
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                <td><a href="#status" title="rgen.py ↵" class="wikilink1">status</a></td><td>RO</td><td>Read-only status register</td>
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        </tr>
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        <tr>
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                <td><a href="#count" title="rgen.py ↵" class="wikilink1">count</a></td><td>RW</td><td>Incrementing statistics register</td>
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        </tr>
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        <tr>
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                <td><a href="#int_msk" title="rgen.py ↵" class="wikilink1">int_msk</a></td><td>Special</td><td>Interrupt status &amp; mask registers</td>
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        </tr>
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        <tr>
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                <td><a href="#soft_set" title="rgen.py ↵" class="wikilink1">soft_set</a></td><td>RW</td><td>Software set, hardware clear register</td>
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        </tr>
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        <tr>
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                <td><a href="#write_stb" title="rgen.py ↵" class="wikilink1">write_stb</a></td><td>RW</td><td>Configuration register with additional strobe output</td>
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        </tr>
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        <tr>
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                <td><a href="#read_stb" title="rgen.py ↵" class="wikilink1">read_stb</a></td><td>RW</td><td>Configuration register with additional strobe outout</td>
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        </tr>
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        <tr>
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                <td><a href="#ext_load" title="rgen.py ↵" class="wikilink1">ext_load</a></td><td>RW</td><td>External-load register</td>
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        </tr>
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        <tr>
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                <td><a href="#user" title="rgen.py ↵" class="wikilink1">user</a></td><td>Special</td><td>User-defined pass-through register</td>
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        </tr>
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</tbody></table>
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</div>
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<h3><a name="config" id="config">config</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>output</td><td>WIDTH</td><td>Read-only value of config bits</td>
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        </tr>
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</tbody></table>
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<p>
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 Basic configuration register, read/write by the configuration side, register bits available read-only from the hardware side.
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</p>
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</div>
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<h3><a name="status" id="status">status</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>input</td><td>WIDTH</td><td>status input bits</td>
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        </tr>
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</tbody></table>
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<p>
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 Status register, read-only by the config side, status bits are combinatorial input from the hardware side.
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</p>
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</div>
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<h3><a name="count" id="count">count</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>output</td><td>WIDTH</td><td>current count value</td>
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        </tr>
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        <tr>
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                <td>NAME_inc</td><td>input</td><td>1</td><td>When high, increment count by 1</td>
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        </tr>
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</tbody></table>
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<p> Basic statistics register. Read/write by config side, count value
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available read-only from hardware side. Increment value provided for
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hardware side.
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</p>
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<h3><a name="int_msk" id="int_msk">int_msk</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME_set</td><td>input</td><td>WIDTH</td><td>set interrupt</td>
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        </tr>
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</tbody></table>
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<p> The int_msk register type provides a pair of interrupt registers.
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The first register is the interrupt status register, and the second is
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the interrupt mask register. The interrupt status register can be set
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by hardware and cleared by software by writing a ‘1’ to the bit which
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should be cleared. Software cannot set any bits in the interrupt
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register, and writing ‘0’ to a bit has no effect (leave unchanged).
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</p>
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<p>The paired mask register has the same number of bits as the status
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register, but each bit set in the mask register disables interrupt
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generation for the corresponding status bit. Note that even if
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interrupt generation is disabled, the status bit will still be set. The
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mask register is Read/Write by software.
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</p>
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<p>The default attribute for this register type sets the default value
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of the mask register; the default value of the status register is
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always zero.
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</p>
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</div>
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<h3><a name="soft_set" id="soft_set">soft_set</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>output</td><td>WIDTH</td><td>Read-only value of config bits</td>
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        </tr>
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        <tr>
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                <td>NAME_clr</td><td>input</td><td>WIDTH</td><td>Read-only value of config bits</td>
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        </tr>
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</tbody></table>
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</div>
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<h3><a name="write_stb" id="write_stb">write_stb</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>output</td><td>WIDTH</td><td>Read-only value of config bits</td>
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        </tr>
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        <tr>
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                <td>NAME_wr_stb</td><td>output</td><td>1</td><td>Pulses on write to this register</td>
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        </tr>
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</tbody></table>
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</div>
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<h3><a name="read_stb" id="read_stb">read_stb</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME</td><td>output</td><td>WIDTH</td><td>Read-only value of config bits</td>
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        </tr>
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        <tr>
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                <td>NAME_wr_stb</td><td>output</td><td>1</td><td>Pulses on read to this register</td>
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        </tr>
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</tbody></table>
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</div>
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<h3><a name="ext_load" id="ext_load">ext_load</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME_out</td><td>output</td><td>WIDTH</td><td>Data from config interface</td>
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        </tr>
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        <tr>
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                <td>NAME_in</td><td>input</td><td>WIDTH</td><td>Sample data in to config interface</td>
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        </tr>
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        <tr>
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                <td>NAME_wr_stb</td><td>output</td><td>1</td><td>Pulsed on final write operation</td>
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        </tr>
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        <tr>
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                <td>NAME_rd_stb</td><td>output</td><td>1</td><td>Pulsed on initial read operation</td>
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        </tr>
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</tbody></table>
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<p> An external-load register is used to sample and cache values which
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may be changing over time. It is intended to be used for values which
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are wider than the configuration interface (otherwise, a <a href="#status" title="rgen.py ↵" class="wikilink1">status</a> or <a href="#write_stb" title="rgen.py ↵" class="wikilink1">write_stb</a>
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register would be more appropriate). The width of an ext_load register
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can be wider than the data_sz width of the module, and rgen will split
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the logical register into multiple physical registers.
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</p>
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<p>
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Current limitations: ext_load registers must be an even multiple of data_size otherwise syntax errors will result.
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</p>
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</div>
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<h3><a name="user" id="user">user</a></h3>
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<div class="level3">
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<table class="inline">
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        <tbody><tr>
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                <th>port name</th><th>direction</th><th>size</th><th>description</th>
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        </tr>
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        <tr>
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                <td>NAME_wr_data</td><td>output</td><td>WIDTH</td><td>Data from config on write</td>
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        </tr>
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        <tr>
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                <td>NAME_wr_stb</td><td>output</td><td>1</td><td>Asserted during write operation</td>
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        </tr>
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        <tr>
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                <td>NAME_wr_ack</td><td>input</td><td>1</td><td>Assert by HW side to acknowledge write</td>
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        </tr>
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        <tr>
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                <td>NAME_rd_data</td><td>input</td><td>WIDTH</td><td>Data to config on read</td>
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        </tr>
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        <tr>
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                <td>NAME_rd_stb</td><td>output</td><td>1</td><td>Asserted during read operation</td>
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        </tr>
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        <tr>
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                <td>NAME_rd_ack</td><td>input</td><td>1</td><td>Assert by HW side to acknowledge read</td>
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        </tr>
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</tbody></table>
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<p> Register with user-defined behavior. Used to implement registers
350
with read-side effects, or where config interface must arbitrate with
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the HW datapath for access to a resource. Provides full handshake for
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each of read and write operations.
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<h1><a name="decoder_generator" id="decoder_generator">Decoder Generator</a></h1>
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<div class="level1">
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<p>
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 Decoders are created using a different set of tags from the register file generator.
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<table class="inline">
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        <tbody><tr>
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                <th>tag name</th><th>attributes</th><th>description</th>
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        </tr>
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        <tr>
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                <td>it_decoder</td><td>name,addr_sz,data_sz</td><td>top-level tag for an address decoder</td>
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        </tr>
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                <td>range</td><td>prefix,base,bits</td><td>tag for an address decode range</td>
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