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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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<a href="00474.html" target="topic">31.32 Property Specification</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_32_1.png" border="0" alt="" title=""><br>NOTE<br>Variables are declarations of property variables. You cannot get the value of these variables.<br><br><img src="31_32_2.png" border="0" alt="" title=""><br>NOTES:<br>1. within the context of a property expr, vpiOpType can be any one of vpiNotOp, vpiImplyOp, vpiDelayedImplyOp, vpiAndOp, vpiOrOp, vpiIfOp, vpiIfElseOp<br>Operands to these operations will be provided in the same order as show in the BNF.&nbsp;</div></td></tr><tr>
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<a href="00475.html" target="topic">31.33 Multiclock Sequence Expression</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00476.html" target="topic">31.34 Sequence Declaration</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_34.png" border="0" alt="" title=""><br>NOTE:<br>the vpiArgument iterator shall return the sequence instance arguments in the order that the formals for the sequence are declared, so that the correspondence between each argument and its respective formal can be made. If a formal has a default value, that value will appear as the argument should the instantiation not provide a value for that argument.&nbsp;</div></td></tr><tr>
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<a href="00477.html" target="topic">31.35 Sequence Expression</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_35.png" border="0" alt="" title=""><br>Notes:<br>2. Within a sequence expression, vpiOpType can be any one of vpiAndOp, vpiIntersectOp, vpiOr, vpiFirstMatchOp, vpiThroughoutOp, vpiWithinOp, vpiUnaryCycleDelayOp, vpiCycleDelayOp, vpiRepeatOp, vpiConsecutiveRepeatOp or vpiGotoRepeatOp.<br>3. For operations, the operands are provided in the same order as the operands appear in BNF, with the following exceptions:<br>vpiUnaryCycleDelayOp: arguments will be: sequence, left range, right range. Right range will only be given if different than left range.<br>vpiCycleDelayOp: argument will be: LHS sequence, rhs sequence, left range, right range. Right range will only be provided if different than left range.<br>all the repeat operators: the first argument will be the sequence being... <a href="00477.html" target="topic">more</a>&nbsp;</div></td></tr><tr>
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<a href="00478.html" target="topic">31.36 Attribute (supersedes IEEE 1364-2001 26.6.42)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00479.html" target="topic">31.37 Atomic Statement (supersedes IEEE 1364-2001 26.6.27)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00480.html" target="topic">31.38 If, if else, return, case, do while (supersedes IEEE 1364-2001 26.6.35, 26.6.36)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00481.html" target="topic">31.39 waits, disables, expect, foreach (supersedes IEEE 1364 26.6.38)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00483.html" target="topic">31.40 Simple expressions (supersedes IEEE 1364-2001 26.6.25)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00484.html" target="topic">31.41 Expressions (supersedes IEEE 1364-2001 26.6.26)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_41.png" border="0" alt="" title=""><br>NOTES:<br>1) For an operator whose type is vpiMultiConcat, the first operand shall be the multiplier expression. The remaining operands shall be the expressions within the concatenation.<br>2) The property vpiDecompile will return a string with a functionally equivalent expression to the original expression within the HDL. Parenthesis shall be added only to preserve precedence. Each operand and operator shall be separated by a single space character. No additional white space shall be added due to parenthesis.<br>3) New vpiOpTypes: vpiInsideOp, vpiMatchOp, vpiCastOp, vpiPreIncOp, vpiPostIncOp, vpiPreDecOp, vpiPostDecOp, vpiIffOp, vpiCycleDelayOp. The cast operation is represented as a unary operation, with its... <a href="00484.html" target="topic">more</a>&nbsp;</div></td></tr><tr>
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<a href="00485.html" target="topic">31.42 Event control (supersedes IEEE 1364-2001 26.6.30)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_42.png" border="0" alt="" title=""><br>NOTE—For event control associated with assignment, the statement shall always be NULL.&nbsp;</div></td></tr><tr>
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<a href="00486.html" target="topic">31.43 Event stmt (supersedes IEEE 1364-2001 26.6.27)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<a href="00487.html" target="topic">31.44 Process (supersedes IEEE 1364-2001 26.6.27)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_44.png" border="0" alt="" title=""><br>NOTE- vpiAlwaysType can be one of: vpiAlwaysComb, vpiAlwaysFF, vpiAlwaysLatch&nbsp;</div></td></tr><tr>
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<a href="00488.html" target="topic">31.45 Assignment (supersedes IEEE 1364-2001 26.6.28)</a>&nbsp;</div></td><td class="Element206" valign="top" width="50%">
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<img src="31_45.png" border="0" alt="" title=""><br>NOTE: vpiOpType will return vpiAssignmentOp for normal non-blocking ’=’ assignments, and the operator combined with the assignment for the operators described in section 7.3.<br><br>For example, the assignment &nbsp;</div></td></tr></table></div></div>
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