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<div class="title">DisplayDriverwDecoder_Top Entity Reference</div>  </div>
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<p>Top entity of the display driver.
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 <a href="class_display_driverw_decoder___top.html#details">More...</a></p>
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Entities</h2></td></tr>
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<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Architecture definition of the <a class="el" href="class_display_driverw_decoder___top.html" title="Top entity of the display driver. ">DisplayDriverwDecoder_Top</a>.  <a href="class_display_driverw_decoder___top_1_1arch.html#details">More...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Libraries</h2></td></tr>
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<a class="el" href="class_display_driverw_decoder___top.html#a0a6af6eef40212dbaf130d57ce711256">ieee</a>&#160;</td><td class="memItemRight" valign="bottom"></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="Use Clauses"></a>
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Use Clauses</h2></td></tr>
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<a class="el" href="class_display_driverw_decoder___top.html#acd03516902501cd1c7296a98e22c6fcb">std_logic_1164</a>&#160;</td><td class="memItemRight" valign="bottom">  </td></tr>
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<a class="el" href="class_display_driverw_decoder___top.html#a2edc34402b573437d5f25fa90ba4013e">numeric_std</a>&#160;</td><td class="memItemRight" valign="bottom">  </td></tr>
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Ports</h2></td></tr>
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<a class="el" href="class_display_driverw_decoder___top.html#a4a4609c199d30b3adebbeb3a01276ec5">clk</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">in</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic</span><span class="vhdlchar"> </span></b></td></tr>
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<tr class="memdesc:a4a4609c199d30b3adebbeb3a01276ec5"><td class="mdescLeft">&#160;</td><td class="mdescRight">input clock, xx MHz. <br /></td></tr>
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<a class="el" href="class_display_driverw_decoder___top.html#aad8dc6359d9e23dabcbf342fadf2fa06">reset</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">in</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic</span><span class="vhdlchar"> </span></b></td></tr>
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<tr class="memdesc:aad8dc6359d9e23dabcbf342fadf2fa06"><td class="mdescLeft">&#160;</td><td class="mdescRight">active high <br /></td></tr>
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<tr class="memitem:a11737d50bbf001c0d64a327a2afca193"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_display_driverw_decoder___top.html#a11737d50bbf001c0d64a327a2afca193">ascii_in</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">in</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic_vector</span><span class="vhdlchar"> </span><span class="vhdlchar">(</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">7</span> <span class="vhdlchar"> </span><span class="keywordflow">downto</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">0</span> <span class="vhdlchar"> </span><span class="vhdlchar">)</span><span class="vhdlchar"> </span></b></td></tr>
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<tr class="memitem:a8f9235710fc037196ed1f7fa93aa0ef3"><td class="memItemLeft" align="right" valign="top"><a id="a8f9235710fc037196ed1f7fa93aa0ef3"></a>
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<a class="el" href="class_display_driverw_decoder___top.html#a8f9235710fc037196ed1f7fa93aa0ef3">wr_en</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">in</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic</span><span class="vhdlchar"> </span></b></td></tr>
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<tr class="memdesc:a8f9235710fc037196ed1f7fa93aa0ef3"><td class="mdescLeft">&#160;</td><td class="mdescRight">active high write enable to store the ASCII code in a register <br /></td></tr>
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<tr class="memitem:afe85e1682ca9b85576a5169bef98848c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_display_driverw_decoder___top.html#afe85e1682ca9b85576a5169bef98848c">disp_data</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">out</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic_vector</span><span class="vhdlchar"> </span><span class="vhdlchar">(</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">14</span> <span class="vhdlchar"> </span><span class="keywordflow">downto</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">0</span> <span class="vhdlchar"> </span><span class="vhdlchar">)</span><span class="vhdlchar"> </span></b></td></tr>
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<tr class="memitem:ac39d5faa22b7c7b88914e8915f901d69"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_display_driverw_decoder___top.html#ac39d5faa22b7c7b88914e8915f901d69">disp_sel</a> &#160;</td><td class="memItemRight" valign="bottom"> <b><b><span class="keywordflow">out</span><span class="vhdlchar"> </span></b></b> <b><span class="comment">std_logic</span><span class="vhdlchar"> </span></b></td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Top entity of the display driver. </p>
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</div><h2 class="groupheader">Member Data Documentation</h2>
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<a id="a11737d50bbf001c0d64a327a2afca193"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a11737d50bbf001c0d64a327a2afca193">&#9670;&nbsp;</a></span>ascii_in</h2>
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          <td class="memname"><a class="el" href="class_display_driverw_decoder___top.html#a11737d50bbf001c0d64a327a2afca193">ascii_in</a> <b><span class="keywordflow">in</span><span class="vhdlchar"> </span></b> <b><span class="comment">std_logic_vector</span><span class="vhdlchar"> </span><span class="vhdlchar">(</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">7</span> <span class="vhdlchar"> </span><span class="keywordflow">downto</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">0</span> <span class="vhdlchar"> </span><span class="vhdlchar">)</span><span class="vhdlchar"> </span></b> </td>
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<span class="mlabels"><span class="mlabel">Port</span></span>  </td>
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<p>ASCII symbols are coded in 1B having values from 0x00 to 0x7F. Current implementation uses 104-Character ASCII Font Map described in MAX6955 Datasheet. <a href="https://datasheets.maximintegrated.com/en/ds/MAX6955.pdf">https://datasheets.maximintegrated.com/en/ds/MAX6955.pdf</a> The MSB is used to light the display dot. For example if you want to display H the code will be 0x48 (or 01001000b). If you want to display H. the code will be 0xC8 (or 11001000b). </p>
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<a id="afe85e1682ca9b85576a5169bef98848c"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#afe85e1682ca9b85576a5169bef98848c">&#9670;&nbsp;</a></span>disp_data</h2>
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          <td class="memname"><a class="el" href="class_display_driverw_decoder___top.html#afe85e1682ca9b85576a5169bef98848c">disp_data</a> <b><span class="keywordflow">out</span><span class="vhdlchar"> </span></b> <b><span class="comment">std_logic_vector</span><span class="vhdlchar"> </span><span class="vhdlchar">(</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">14</span> <span class="vhdlchar"> </span><span class="keywordflow">downto</span><span class="vhdlchar"> </span><span class="vhdlchar"> </span> <span class="vhdldigit">0</span> <span class="vhdlchar"> </span><span class="vhdlchar">)</span><span class="vhdlchar"> </span></b> </td>
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<p>Typically the data fed to display (single or multiple) is provided for single display at a time. If multiple displays are required disp_sel signal must be provided (according typical dynamic display indication).</p>
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<h1><a class="anchor" id="disp_data_bit_mapping"></a>
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Display Segment Bit Mapping</h1>
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<table class="doxtable">
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<th align="center">Bit Number </th><th align="center">0 </th><th align="center">1</th><th align="center">2</th><th align="center">3</th><th align="center">4</th><th align="center">5</th><th align="center">6</th><th align="center">7</th><th align="center">8</th><th align="center">9</th><th align="center">10</th><th align="center">11</th><th align="center">12</th><th align="center">13</th><th align="center">14  </th></tr>
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<td align="center">Display Segment</td><td align="center">a </td><td align="center">b</td><td align="center">c</td><td align="center">d</td><td align="center">e</td><td align="center">f</td><td align="center">g1</td><td align="center">g2</td><td align="center">h</td><td align="center">i</td><td align="center">j</td><td align="center">k</td><td align="center">l</td><td align="center">m</td><td align="center">dp </td></tr>
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<p>Note that there is no standard way to name the segments. Current data bits correspondt to display segments according this picture: <a href="https://www.maximintegrated.com/en/images/appnotes/3211/3211Fig02.gif">https://www.maximintegrated.com/en/images/appnotes/3211/3211Fig02.gif</a> </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac39d5faa22b7c7b88914e8915f901d69">&#9670;&nbsp;</a></span>disp_sel</h2>
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          <td class="memname"><a class="el" href="class_display_driverw_decoder___top.html#ac39d5faa22b7c7b88914e8915f901d69">disp_sel</a> <b><span class="keywordflow">out</span><span class="vhdlchar"> </span></b> <b><span class="comment">std_logic</span><span class="vhdlchar"> </span></b> </td>
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<p>If more displays needs to be fed change disp_sel to vector with length equal to number of displays. Use principles of the standard dynamic indication: provide data then enable the displays sequentially. If brightness control is desired just AND the selector and the PWM controller output. </p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li>C:/Projects/single-14-segment-display-driver-w-decoder/Project/Sources/<a class="el" href="_display_driverw_decoder___top_8vhd.html">DisplayDriverwDecoder_Top.vhd</a></li>
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