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📁 这是一本关于verilog编程语言的教程,对学习verilog语言有帮助
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17.4.1 操作数类型</div>
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下列类型是不被允许的：
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<li class="Element601">非整数类型（<span style="color: #0000FF">shortreal</span>、<span style="color: #0000FF">real</span>、<span style="color: #0000FF">realtime</span>）</li>
<li class="Element601">字符串</li>
<li class="Element601">事件</li>
<li class="Element601"><span style="color: #0000FF">chandle</span></li>
<li class="Element601">类</li>
<li class="Element601">联合数组</li>
<li class="Element601">动态数组</li>
</ul>固定尺寸数组（压缩的以及非压缩的）都可以当作一个整体、部分选择和被索引的位使用。片断可以是常量、参数或变量。&nbsp;</p>
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&nbsp;</p>
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下面的例子显示了一些可能的结构体和联合体成员比较的格式： </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00571"><pre class="Element12"><span style="color: #0000FF">typedef</span> <span style="color: #0000FF">int</span> <span style="color: #800080">[</span><span style="color: #FF0000">4</span><span style="color: #800080">] </span>array<span style="color: #800080">;</span>
<span style="color: #0000FF">typedef struct</span> <span style="color: #800080">{</span><span style="color: #0000FF">int</span><span style="color: #800080"> </span>a<span style="color: #800080">, </span>b<span style="color: #800080">, </span>c<span style="color: #800080">, </span>d<span style="color: #800080">}</span> record<span style="color: #800080">;</span>
<span style="color: #0000FF">union</span> <span style="color: #800080">{</span>record r<span style="color: #800080">;</span> array a<span style="color: #800080">;} </span>p<span style="color: #800080">, </span>q<span style="color: #800080">;</span></pre></div></div>
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&nbsp;</p>
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下列的比较在表达式中是合法的： </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00572"><pre class="Element12">p<span style="color: #800080">.</span>a <span style="color: #800080">== </span>q<span style="color: #800080">.</span>a</pre></div></div>
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&nbsp;</p>
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以及 </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00573"><pre class="Element12">p<span style="color: #800080">.</span>r<span style="color: #800080"> == </span>q<span style="color: #800080">.</span>r</pre></div></div>
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&nbsp;</p>
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下面的例子提供了表达式中数组使用的进一步的演示。 </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00574"><pre class="Element12"><span style="color: #0000FF">logic</span> <span style="color: #800080">[</span><span style="color: #FF0000">7</span><span style="color: #800080">:</span><span style="color: #FF0000">0</span><span style="color: #800080">]</span> arrayA <span style="color: #800080">[</span><span style="color: #FF0000">0</span><span style="color: #800080">:</span><span style="color: #FF0000">15</span><span style="color: #800080">],</span> arrayB<span style="color: #800080">[</span><span style="color: #FF0000">0</span><span style="color: #800080">:</span><span style="color: #FF0000">15</span><span style="color: #800080">];</span></pre></div></div>
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&nbsp;</p>
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下列的比较是合法的： </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00575"><pre class="Element12">arrayA <span style="color: #800080">==</span> arrayB<span style="color: #800080">;</span>
arrayA <span style="color: #800080">!=</span> arrayB<span style="color: #800080">;</span>
arrayA<span style="color: #800080">[</span>i<span style="color: #800080">] &gt;=</span> arrayB<span style="color: #800080">[</span>j<span style="color: #800080">];</span>
arrayB<span style="color: #800080">[</span>i]<span style="color: #800080">[</span>j<span style="color: #800080">+:</span><span style="color: #FF0000">2</span><span style="color: #800080">] ==</span> arrayA<span style="color: #800080">[</span>k<span style="color: #800080">][</span>m<span style="color: #800080">-:</span>2<span style="color: #800080">];</span>
<span style="color: #800080">(</span>arrayA<span style="color: #800080">[</span>i<span style="color: #800080">] &amp; (~</span>arrayB<span style="color: #800080">[</span>j<span style="color: #800080">])) ==</span> <span style="color: #FF0000">0</span><span style="color: #800080">;</span></pre></div></div>
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