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<a href="00886.html" target="topic">附录H 并发断言的形式语义</a>, <a href="01049.html" target="topic">主题</a></div>
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<a href="#" onmousedown="showPopup(this, 'popup00849');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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H.3 语义</div>
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Let P be the set of atomic propositions. </p>
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The semantics of assertions and properties is defined via a relation of satisfaction by empty, finite, and infinite </p>
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words over the alphabet Σ = 2P U {T, ⊥}. Such a word is an empty, finite, or infinite sequence of elements of Σ. </p>
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The number of elements in the sequence is called the length of the word, and the length of word w is denoted </p>
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|w|. Note that |w| is either a non-negative integer or infinity. </p>
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The sequence elements of a word are called its letters and are assumed to be indexed consecutively beginning </p>
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at zero. If |w| > 0, then the first letter of w is denoted w0; if |w| > 1, then the second letter of w is denoted w1; and </p>
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so forth. w i.. denotes the word obtained from w by deleting its first i letters. If i < |w|, then w i.. = w iw i+1.... If </p>
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i > |w|, then w i.. is empty. </p>
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If i < j, then w i, j denotes the finite word obtained from w by deleting its first i letters and also deleting all letters </p>
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after its ( j + 1)st. If i < j < |w|, then w i, j = w iw i+1...w j. </p>
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If w is a word over Σ, define w to be the word obtained from w by interchanging T with ⊥. More precisely, </p>
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w i = T if w i = ⊥ ; w i = ⊥ if w i = T; and w i = w i if w i is an element in 2P. </p>
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The semantics of clocked sequences and properties is defined in terms of the semantics of unclocked </p>
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sequences and properties. See the subsection on rewrite rules for clocks below. </p>
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It is assumed that the satisfaction relation ζ b is defined for elements ζ in 2P and boolean expressions b. For </p>
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any boolean expression b, define </p>
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T b and ⊥ b .</p></div>
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<a href="00886.html" target="topic">附录H 并发断言的形式语义</a></p></div>
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描述 </div></td></tr><tr>
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<a href="00822.html" target="topic">H.3.1 Rewrite rules for clocks</a> </div></td><td class="Element206" valign="top" width="50%">
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The semantics of clocked sequences and properties is defined in terms of the semantics of unclocked<br>sequences and properties. The following rewrite rules define the transformation of a clocked sequence or property<br>into an unclocked version that is equivalent for the purposes of defining the satisfaction relation. In this<br>transformation, it is required that the conditions in event controls not be dependent upon any local variables.<br>? @(c) b ( !c [*0:$] ##1 c & b ) .<br>? @(c)( 1, v = e ) ( @(c) 1 ##0 ( 1, v = e )) .<br>? @(c)( P )... <a href="00822.html" target="topic">more</a> </div></td></tr><tr>
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<a href="00823.html" target="topic">H.3.2 Tight satisfaction without local variables</a> </div></td><td class="Element206" valign="top" width="50%">
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Tight satisfaction is denoted by . For unclocked sequences without local variables, tight satisfaction is<br>defined as follows. w, x, y, z denote finite words over Σ.<br>? w b iff |w| = 1 and w0 b .<br>? w ( R ) iff w R .<br>? w ( R1 ##1 R2 ) iff there exist x, y such that w = xy and x R1 and y R2 .<br>? w ( R1 ##0 R2 ) iff there exist x, y, z such that w = xyz and |y| = 1, and xy R1 and yz R2 .... <a href="00823.html" target="topic">more</a> </div></td></tr><tr>
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<a href="00824.html" target="topic">H.3.3 Satisfaction without local variables</a> </div></td><td class="Element206" valign="top" width="50%">
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<a href="00827.html" target="topic">H.3.4 Local variable flow</a> </div></td><td class="Element206" valign="top" width="50%">
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This subsection defines inductively how local variable names flow through unclocked sequences. Below, “U”<br>denotes set union, “ ” denotes set intersection, “–” denotes set difference, and “{}” denotes the empty set.<br>The function “sample” takes a sequence as input and returns a set of local variable names as output. Intuitively,<br>this function returns the set of local variable names that are sampled (i.e., assigned) in the sequence.<br>The function “block” takes a sequence as input and returns a set of local variable names as output. Intuitively,<br>this function returns the set of local variable names that are blocked from... <a href="00827.html" target="topic">more</a> </div></td></tr><tr>
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<a href="00828.html" target="topic">H.3.5 Tight satisfaction with local variables</a> </div></td><td class="Element206" valign="top" width="50%">
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A local variable context is a function that assigns values to local variable names. If L is a local variable context,<br>then dom(L) denotes the set of local variable names that are in the domain of L. If D dom(L), then L|D<br>means the local variable context obtained from L by restricting its domain to D.<br>In the presence of local variables, tight satisfaction is a four-way relation defining when a finite word w over<br>the alphabet Σ together with an input local variable context L0 satisfies an unclocked sequence R and yields an<br>output local variable context L1. This... <a href="00828.html" target="topic">more</a> </div></td></tr><tr>
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<a href="00829.html" target="topic">H.3.6 Satisfaction with local variables</a> </div></td><td class="Element206" valign="top" width="50%">
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