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| </div> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="_timing_constraints"><a class="anchor" href="#_timing_constraints"></a>Timing Constraints</h2> |
| <div class="sectionbody"> |
| <div class="paragraph normal"> |
| <p>Timing constraints are based on events. An event is an occurrence of one of the following actions:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><span class="maroon"><strong>command</strong></span> Command_name, possibly with parameter(s)</p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>notification</strong></span> Notification_name, possibly with parameter(s)</p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>signal</strong></span> Signal_name, possibly with parameter(s)</p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>reply</strong></span>, possibly with parameter(s), e.g., <span class="maroon"><strong>reply</strong></span>(3), or also giving the corresponding command: <span class="maroon"><strong>reply to command</strong></span> Command_name, possibly with parameter(s)</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>In addition, events can be referred to by their type, without giving a concrete name:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><span class="maroon"><strong>any command</strong></span></p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>any signal</strong></span></p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>any notification</strong></span></p> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>any event</strong></span></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>When specifying events of interest, the states in which they may be observed can also be given: <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Furthermore, an optional condition expression can be specified in which references to interface variables can be used:</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="maroon"><strong>in</strong> <strong>state</strong></span> States event <span class="maroon"><strong>when</strong></span> a > 1, where <em>a</em> is an interface variable</p> |
| </div> |
| <div class="paragraph"> |
| <p>event <span class="maroon"><strong>when</strong></span> b == 2, where <em>b</em> is an interface variable</p> |
| </div> |
| <div class="paragraph"> |
| <p>The optional condition after <span class="maroon"><strong>when</strong></span> can be used only if the time constraint is given in an interface definition (.interface file). |
| When the condition is evaluated, the value of the variables at the time of the event observation are used.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Timing constraints are defined as rules and specify admissible intervals between observed events. There are five types of timing rules:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>ruleName <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event1 <span class="maroon"><strong>and</strong> <strong>in</strong> <strong>state</strong></span> States event2 → interval <span class="maroon"><strong>between</strong> <strong>events</strong></span><br> |
| <em>specifies that if there are two successive occurrences of event1 and event2 in one of the specified states then the difference of their time stamps is an element of the specified interval.</em> Example:</p> |
| <div class="paragraph"> |
| <p>req1 <span class="maroon"><strong>in</strong> <strong>state</strong></span> on <span class="maroon"><strong>command</strong></span> Command <span class="maroon"><strong>and</strong> <strong>reply</strong></span>(5) → [ 5.0 <span class="maroon"><strong>ms</strong></span> .. 10.6 <span class="maroon"><strong>ms</strong></span> ] <span class="maroon"><strong>between events</strong></span></p> |
| </div> |
| </li> |
| <li> |
| <p>ruleName <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event1 <span class="maroon"><strong>when</strong></span> expression - interval → <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event2<br> |
| <em>specifies that if event1 occurs in one of the specified states and the value of a is greater than 0 then event2 will occur in one of the specified states and the difference of the time stamps of these two events is an element of the specified interval.</em> Example:</p> |
| <div class="paragraph"> |
| <p>req2 <span class="maroon"><strong>in</strong> <strong>state</strong></span> on, off <span class="maroon"><strong>command</strong></span> Level <span class="maroon"><strong>when</strong></span> a > 0 - [ .. 3.6 <span class="maroon"><strong>ms</strong></span> ] → <span class="maroon"><strong>notification</strong></span> Done</p> |
| </div> |
| </li> |
| <li> |
| <p>ruleName <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event1 → <span class="maroon"><strong>absent in</strong> <strong>state</strong></span> States event2 <span class="maroon"><strong>in</strong></span> interval<br> |
| <em>specifies that if event1 occurs in one of the specified states then event2 will not occur in one of the specified states in the specified interval after event1.</em> Example:</p> |
| <div class="paragraph"> |
| <p>req3 <span class="maroon"><strong>in state</strong></span> on, off <span class="maroon"><strong>command</strong></span> Level → <span class="maroon"><strong>absent notification</strong></span> Done <span class="maroon"><strong>in</strong></span> [ .. 3.6 <span class="maroon"><strong>ms</strong></span> ]</p> |
| </div> |
| </li> |
| <li> |
| <p>ruleName <span class="maroon"><strong>in</strong> <strong>state</strong></span> States event1 <span class="maroon"><strong>then</strong></span> event2 <span class="maroon"><strong>with</strong></span> <span class="maroon"><strong>period</strong></span> realNumber <span class="maroon"><strong>ms</strong> <strong>jitter</strong></span> realNumber <span class="maroon"><strong>ms</strong> <strong>until</strong></span> event3<br> |
| <em>specifies that if event1 occurs in one of the specified states then event2 will occur periodically with period realNumber and jitter realNumber until event3 occurs.</em> Example:</p> |
| <div class="paragraph"> |
| <p>req4 <span class="maroon"><strong>in state</strong></span> on <span class="maroon"><strong>command</strong></span> Command <span class="maroon"><strong>then in state</strong></span> operational <span class="maroon"><strong>notification</strong></span> Done <span class="maroon"><strong>with period</strong></span> 750.0 <span class="maroon"><strong>ms jitter</strong></span> 50.0 <span class="maroon"><strong>ms until reply to Command</strong></span> <br> |
| <br> |
| Note that this requires that the periodic notifications should occur in state operational.</p> |
| </div> |
| </li> |
| <li> |
| <p><span class="maroon"><strong>group</strong></span> ruleName <span class="maroon"><strong>in</strong> <strong>state</strong></span> States constraint (one of first three patterns) - interval1 → event1 - interval2 → event2 …​.. <span class="maroon"><strong>end</strong> <strong>group</strong></span><br> |
| <em>specifies a scenario in terms of a sequence of events.</em> Example:</p> |
| <div class="paragraph"> |
| <p><span class="maroon"><strong>group</strong></span> req5</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="maroon"><strong>in state</strong></span> on <span class="maroon"><strong>command</strong></span> Command <span class="maroon"><strong>and notification</strong></span> Done → [ .. 5.2 <span class="maroon"><strong>ms</strong></span> ] <span class="maroon"><strong>between events</strong></span> |
| <br> |
| - [ 10.0 <span class="maroon"><strong>ms</strong></span> .. 100.0 <span class="maroon"><strong>ms</strong></span> ] → command Level |
| <br> |
| - [ .. 20.0 <span class="maroon"><strong>ms</strong></span> ]→ <span class="maroon"><strong>reply to command</strong></span> Level |
| <br> |
| <span class="maroon"><strong>end group</strong></span></p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>States is a list of states, e.g., "on, off"; the "<span class="maroon"><strong>in</strong> <strong>state</strong></span>" part is optional.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For an interval there are three possible forms:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>[ 10.1 <span class="maroon"><strong>ms</strong></span> .. 25.7 <span class="maroon"><strong>ms</strong></span> ] specifying a lower bound and an upper bound</p> |
| </li> |
| <li> |
| <p>[ .. 25.7 <span class="maroon"><strong>ms</strong></span> ] specifying an upper bound only</p> |
| </li> |
| <li> |
| <p>[ 10.1 <span class="maroon"><strong>ms</strong></span> .. ] specifying a lower bound only</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| </body> |
| </html> |
