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6 <title>Clock State Machine</title>
10 <h3>Clock State Machine</h3>
11 <p>Last update:
12 <!-- #BeginDate format:En2m -->4-Aug-2011 23:40<!-- #EndDate -->
13 UTC</p>
21 <li class="inline"><a href="#state">State Transition Function</a></li>
25 …p>In the NTPv4 specification and reference implementation a state machine is used to manage the sy…
26 …p> The state machine is activated upon receipt of an update by the clock discipline algorithm. its…
28 …p>Most computers today incorporate a time-of-year (TOY) chip to maintain the time when the power …
30 …p>Under ordinary conditions, the clock discipline gradually slews the clock to the correct time, s…
31 …p> In practice, the need for a step has been extremely rare and almost always the result of a hard…
32 …p>Historically, the most important application of the step function was when a leap second was ins…
33 …p>In some applications the clock can never be set backward, even it accidentally set forward a …
35 …p>When the daemon is started after a considerable downtime, it could be the TOY chip clock has dri…
37 <p>The state machine operates in one of four nonoverlapping intervals.</p>
48 <h4 id="state">State Transition Function</h4>
49 …p>The state machine consists of five states. An event is created when an update is received by the…
51 <dt>FSET - The frequency file is present</dt>
52 <dd> Load the frequency file, initialize the hold timer and continue in SYNC state.</dd>
53 <dt>NSET - The frequency file is not present</dt>
54 <dd>Initialize the hold timer and continue in FREQ state.</dd>
55 <dt>FREQ - Frequency training state</dt>
56 …is happens, calculate the frequency, initialize the hold counter and transition to SYNC state.</dd>
57 <dt>SPIK - Spike state</dt>
58 …state as long as updates greater than the step threshold occur. If a valid update is received, con…
59 <dt>SYNC - Ordinary clock discipline state</dt>