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bad args </div></td><td class="Element67" valign="top" width="17%">
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no coverage </div></td><td class="Element67" valign="top" width="22%">
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partial coverage </div></td></tr></table></div></div>
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</p>
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Starting, stopping, or resetting coverage multiple times in succession for the same instance(s) has no further effect if coverage has already been started, stopped, or reset for that/those instance(s). </p>
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The hierarchy(ies) being controlled or queried are specified as follows. </p>
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‘SV_MODULE_COV, "unique module def name" </p>
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provides coverage of all instances of the given module (the unique module name is a string), excluding any child instances in the instances of the given module. The module definition name can use special notation to describe nested module definitions. </p>
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‘SV_COV_HIER, "module name" </p>
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provides coverage of all instances of the given module, including all the hierarchy below. </p>
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‘SV_MODULE_COV, instance_name </p>
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provides coverage of the one named instance. The instance is specified as a normal Verilog hierarchical path. </p>
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‘SV_COV_HIER, instance_name </p>
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provides coverage of the named instance, plus all the hierarchy below it. </p>
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All the permutations are summarized in Table 29-2. </p><p class="Element10" style="text-align: center">
<strong>Table 29-2: Instance coverage permutations</strong></p><div class="Element63">
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Control/query </div></td><td class="Element65" valign="top" width="54%">
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“Definition name” </div></td><td class="Element65" valign="top" width="37%">
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instance.name </div></td></tr><tr>
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‘SV_COV_MODULE </div></td><td class="Element67" valign="top" width="54%">
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The sum of coverage for all instances of the named module, excluding any hierarchy below those instances. </div></td><td class="Element67" valign="top" width="37%">
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Coverage for just the named instance, excluding any hierarchy in instances below that instance. </div></td></tr><tr>
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‘SV_COV_HIER </div></td><td class="Element67" valign="top" width="54%">
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The sum of coverage for all instances of the named module, including all coverage for all hierarchy below those instances. </div></td><td class="Element67" valign="top" width="37%">
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Coverage for the named instance and any hierarchy below it. </div></td></tr></table></div></div>
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NOTE—Definition names are represented as strings, whereas instance names are referenced by hierarchical paths. A hierarchical path need not include any . if the path refers to an instance in the current context (i.e., normal Verilog hierarchical path rules apply). </p><p class="Element10" style="text-align: center">
<img src="example_29_1.png" border="0" alt="" title=""> </p>
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<strong>Example 29-1 — Hierarchical instance example</strong></p><p class="Element10">
If coverage is enabled on all instances shown in Example 29-1 —, then: </p>
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$coverage_control(‘SV_COV_CHECK, ‘SV_COV_TOGGLE, ‘SV_COV_HIER, $root) </p>
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checks all instances to verify they have coverage and, in this case, returns ‘SV_COV_OK. </p>
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$coverage_control(‘SV_COV_RESET, ‘SV_COV_TOGGLE, ‘SV_COV_MODULE, "DUT") </p>
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resets coverage collection on both instances of the DUT, specifically, $root.tb.unit1 and </p>
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$root.tb.unit2, but leaves coverage unaffected in all other instances. </p>
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$coverage_control(‘SV_COV_RESET, ‘SV_COV_TOGGLE, ‘SV_COV_MODULE, </p>
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$root.tb.unit1) </p>
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resets coverage of only the instance $root.tb.unit1, leaving all other instances unaffected. </p>
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$coverage_control(‘SV_COV_STOP, ‘SV_COV_TOGGLE, ‘SV_COV_HIER, </p>
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$root.tb.unit1) </p>
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resets coverage of the instance $root.tb.unit1 and also reset coverage for all instances below it, specifically </p>
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$root.tb.unit1.comp and $root.tb.unit1.ctrl. </p>
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$coverage_control(‘SV_COV_START, ‘SV_COV_TOGGLE, ‘SV_COV_HIER, "DUT") </p>
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starts coverage on all instances of the module DUT and of all hierarchy(ies) below those instances. In this design, coverage is started for the instances $root.tb.unit1, $root.tb.unit1.comp, $root.tb.unit1.ctrl, $root.tb.unit2, $root.tb.unit2.comp, and $root.tb.unit2.ctrl.</p></div>
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