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29.2.2.1 $coverage_control</div>
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<div class="Element13"><div class="Element12" id="code00994"><pre class="Element12">$coverage_control(control_constant,
coverage_type,
scope_def,
modules_or_instance)</pre></div></div>
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This function is used to control or query coverage availability in the specified portion of the hierarchy. The following control options are available: </p>
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‘SV_COV_START </p>
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If possible, starts collecting coverage information in the specified hierarchy. No effect if coverage is already being collected. Note that coverage is automatically started at the beginning of simulation for all portions of the hierarchy enabled for coverage. </p>
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‘SV_COV_STOP </p>
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Stops collecting coverage information in the specified hierarchy. No effect if coverage is not being collected. </p>
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‘SV_COV_RESET </p>
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Resets all available coverage information in the specified hierarchy. No effect if coverage not available. </p>
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‘SV_COV_CHECK </p>
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Checks if coverage information can be obtained from the specified hierarchy. Note the possibility of having coverage information does imply that coverage is being collected, as the coverage could have been stopped. </p>
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</p>
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The return value is a ‘define name, with the value indicating the success of the action. </p>
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‘SV_COV_OK </p>
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On a check operation denotes that coverage is fully available in the specified hierarchy. For all other operations, represents successful and complete execution of the desired operation. </p>
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‘SV_COV_ERROR </p>
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On all operations means that the control operation failed without any effect, typically due to errors in arguments, such as a non-existing module. </p>
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‘SV_COV_NOCOV </p>
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On a check or start operation, denotes that coverage is not available at any point in the specified hierarchy. </p>
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‘SV_COV_PARTIAL </p>
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On a check or start operation, denotes that coverage is only partially available in the specified hierarchy. </p>
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</p>
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The table below describes the possible return values for each of the coverage control options: </p><p class="Element10" style="text-align: center">
<strong>Table 29-1: Coverage control return values</strong></p><div class="Element63">
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<td class="Element65" valign="top" width="23%">
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</div></td><td class="Element65" valign="top" width="19%">
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‘SV_COV_OK </div></td><td class="Element65" valign="top" width="19%">
<div class="Element66">
‘SV_COV_ERROR </div></td><td class="Element65" valign="top" width="17%">
<div class="Element66">
‘SV_COV_NOCOV </div></td><td class="Element65" valign="top" width="22%">
<div class="Element66">
‘SV_COV_PARTIAL </div></td></tr><tr>
<td class="Element67" valign="top" width="23%">
<div class="Element68">
‘SV_COV_START </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
success </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
bad args </div></td><td class="Element67" valign="top" width="17%">
<div class="Element68">
no coverage </div></td><td class="Element67" valign="top" width="22%">
<div class="Element68">
partial coverage </div></td></tr><tr>
<td class="Element67" valign="top" width="23%">
<div class="Element68">
‘SV_COV_STOP </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
success </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
bad args </div></td><td class="Element67" valign="top" width="17%">
<div class="Element68">
- </div></td><td class="Element67" valign="top" width="22%">
<div class="Element68">
- </div></td></tr><tr>
<td class="Element67" valign="top" width="23%">
<div class="Element68">
‘SV_COV_RESET </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
success </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
bad args </div></td><td class="Element67" valign="top" width="17%">
<div class="Element68">
- </div></td><td class="Element67" valign="top" width="22%">
<div class="Element68">
- </div></td></tr><tr>
<td class="Element67" valign="top" width="23%">
<div class="Element68">
‘SV_COV_CHECK </div></td><td class="Element67" valign="top" width="19%">
<div class="Element68">
full coverage </div></td><td class="Element67" valign="top" width="19%">
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