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<a href="00863.html" target="topic">第三章 数据类型</a>, <a href="00896.html" target="topic">主题</a></div>
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<a href="#" onmousedown="showPopup(this, 'popup00013');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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3.3 整数数据类型</div>
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SystemVerilog提供了几种整数数据类型，它们是Verilog和C数据类型的结合： </p>
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<strong>表格3-1：整数数据类型</strong> </p><div class="Element63">
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<span style="color: #0000FF">shortint</span> </div></td><td class="Element67" valign="top" width="80%">
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两态SystemVerilog数据类型，16位有符号整数 </div></td></tr><tr>
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<span style="color: #0000FF">int</span> </div></td><td class="Element67" valign="top" width="80%">
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两态SystemVerilog数据类型，32位有符号整数 </div></td></tr><tr>
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<span style="color: #0000FF">longint</span> </div></td><td class="Element67" valign="top" width="80%">
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两态SystemVerilog数据类型，64位有符号整数 </div></td></tr><tr>
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<span style="color: #0000FF">byte</span> </div></td><td class="Element67" valign="top" width="80%">
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两态SystemVerilog数据类型，8位有符号整数或ASCII码字符 </div></td></tr><tr>
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<span style="color: #0000FF">bit</span> </div></td><td class="Element67" valign="top" width="80%">
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两态SystemVerilog数据类型，用户定义的向量尺寸 </div></td></tr><tr>
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<span style="color: #0000FF">logic</span> </div></td><td class="Element67" valign="top" width="80%">
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四态SystemVerilog数据类型，用户定义的向量尺寸 </div></td></tr><tr>
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<span style="color: #0000FF">reg</span> </div></td><td class="Element67" valign="top" width="80%">
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四态Verilog-2001数据类型，用户定义的向量尺寸 </div></td></tr><tr>
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<span style="color: #0000FF">integer</span> </div></td><td class="Element67" valign="top" width="80%">
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四态Verilog-2001数据类型，32位有符号整数 </div></td></tr><tr>
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<span style="color: #0000FF">time</span> </div></td><td class="Element67" valign="top" width="80%">
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四态Verilog-2001数据类型，64位无符号整数 </div></td></tr></table></div></div>
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<a href="00863.html" target="topic">第三章 数据类型</a></p></div>
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描述 </div></td></tr><tr>
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<a href="00390.html" target="topic">3.3.1 integral类型</a> </div></td><td class="Element206" valign="top" width="50%">
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在本参考手册中，术语integral指的基本的整数数据类型、压缩数组、压缩结构体、压缩联合体、枚举类型和时间类型。 </div></td></tr><tr>
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<a href="00391.html" target="topic">3.3.2 两态（两值）与四态（四值）数据类型</a> </div></td><td class="Element206" valign="top" width="50%">
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具有未知值（<span style="color: #FF0000">X</span>）和高阻值（<span style="color: #FF0000">Z</span>）的类型称为四态类型，包括<span style="color: #0000FF">logic</span>、<span style="color: #0000FF">reg</span>、<span style="color: #0000FF">integer</span>和<span style="color: #0000FF">time</span>。其它不具有未知值及高阻值的类型称为两态类型，例如<span style="color: #0000FF">bit</span>和<span style="color: #0000FF">int</span>。<br><br><span style="color: #0000FF">int</span>和i<span style="color: #0000FF">nteger</span>的区别是：<span style="color: #0000FF">int</span>是两态逻辑而<span style="color: #0000FF">integer</span>是四态逻辑。四态值需要一个额外的位来编码<span style="color: #FF0000">X</span>和<span style="color: #FF0000">Z</span>状态。两态数据类型的仿真速度更快一些，而且占用更少的内存，因而在某些设计风格中成为首选数据类型。 </div></td></tr><tr>
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<a href="00392.html" target="topic">3.3.3 有符号与无符号数据类型</a> </div></td><td class="Element206" valign="top" width="50%">
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整数类型使用整数算术，并且可以是有符号的也可以是无符号的。这些会影响某些操作码的含义，例如“<span style="color: #800080"><</span>”等。 </div></td></tr></table></div></div>
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<a href="00863.html" target="topic">第三章 数据类型</a>, <a href="00896.html" target="topic">主题</a></div>
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