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<a href="00861.html" target="topic">第三十一章 SystemVerilog VPI Object Model</a></div>
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<a href="#" onmousedown="showPopup(this, 'popup00591');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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31.1 简介（一般信息）</div>
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SystemVerilog extends the Verilog Procedural Interface (VPI) object diagrams to support SystemVerilog constructs. The VPI object diagrams document the properties of objects and the relationships of objects. How these diagrams illustrate this information is explained in Section 26 of the IEEE Std. 1364-2001 Verilog standard. The SystemVerilog extensions to the VPI diagrams are in the form of changes to or additions to the diagrams contained in 1364-2001 Verilog standard. </p>
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The following table summarizes the changes and additions made to the Verilog VPI object diagrams: </p><p class="Element10" style="text-align: center">
<strong>Table 31-4: Verilog VPI object diagram changes and additions</strong></p><div class="Element63">
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Diagram </div></td><td class="Element65" valign="top" width="50%">
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Notes </div></td></tr><tr>
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<div class="Element68">
Instances </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Interface </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Program </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Module </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
Replaces IEEE 1364.2001 section 26.6.1 </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Modport </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Interface tf decl </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Ports </div></td><td class="Element67" valign="top" width="50%">
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Replaces IEEE 1364.2001, section 26.6.5 </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
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Ref Obj </div></td><td class="Element67" valign="top" width="50%">
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New </div></td></tr><tr>
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Variable </div></td><td class="Element67" valign="top" width="50%">
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Replaces IEEE 1364.2001 section 26.6.8 </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Var select </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Typespec </div></td><td class="Element67" valign="top" width="50%">
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New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
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Variable Drivers and Loads </div></td><td class="Element67" valign="top" width="50%">
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New </div></td></tr><tr>
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<div class="Element68">
Instance Arrays </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
Replaces IEEE 1364.2001 section 26.6.2 </div></td></tr><tr>
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Scope </div></td><td class="Element67" valign="top" width="50%">
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Replaces IEEE 1364.2001 section 26.6.3 </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
IO Declaration </div></td><td class="Element67" valign="top" width="50%">
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Replaces IEEE 1364.2001 section 26.6.4 </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
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Class Object Definition </div></td><td class="Element67" valign="top" width="50%">
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New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Constraint </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Dist Item </div></td><td class="Element67" valign="top" width="50%">
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New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Constraint Expression </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Class Variables </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Structure/Union </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Named Events </div></td><td class="Element67" valign="top" width="50%">
<div class="Element68">
New </div></td></tr><tr>
<td class="Element67" valign="top" width="50%">
<div class="Element68">
Named Event Array </div></td><td class="Element67" valign="top" width="50%">
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