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      <title>Flow design rules</title>
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      <div class="title_topic3" id="xps10_pagetitle">Flow design rules</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('routingtools/flow_direction.html');return(false);">Overview</a></p>
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      </table><br><p class="para_topic">A standard <b class="uiTerm">Design Rule</b> enforces the flow direction. The rule creates a violation if a part is positioned contrary to the flow direction of the segments to which the part is connected.
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      <p class="para_topic">The check consists of comparing the characteristic named FLOW_DIRECTION on the connecting port. If the value of this characteristic is <b class="uiTerm">EITHER</b> or <b class="uiTerm">NONE</b>, no violation is created.&nbsp;If the value of FLOW_DIRECTION is In, and the <b class="uiTerm">Flow Direction</b> assigned to the attaching segment is towards the part, no violation is created. If the value of FLOW is Out, and the <b class="uiTerm">Flow Direction</b> assigned to the attaching segment is away from the part, no violation is created. In any other case, a <b class="uiTerm">Design Rule Violation</b> is created.
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      <p class="para_topic">If a violation is created, the subject objects are the segment and the part. The name of the violation is <b class="uiTerm">Contrary Flow Directions</b>.&nbsp;The descriptive text is: The <b class="uiTerm">Flow Direction Characteristic</b> of the part does not agree with the <b class="uiTerm">Flow Direction</b> of the attached segment.
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