TSU CONS Reliability Meeting - 4

<h1>TSU CONS Reliability Meeting - 4</h1>
<p>Present: M. Blaszkiewicz, L. Felsberger, N. Voumard </p>
<h2>Minutes</h2>
<p>This meeting was focused on discussion of the reliability simulations of top-level component representation of the system. They were completed to establish a reliability target for the TSU board based in the context of other systems.  </p>
<h3>SPS</h3>
<p>Largely overlooked so far, as we tend to focus on LHC. There are significant differences between the system deployment there.</p>
<ul>
<li>The dumps occur every 3 - 15 seconds.</li>
<li>It is unclear how often a check can be performed there; there is IPOC, might not be XPOC.
<ul>
<li>"Rough XPOC" could be implemented; to be seen, also through the results of this study.</li>
</ul>
</li>
<li>A more comprehensive check is carried out every 2-3 months, worst case - 6 months.</li>
<li>Criticallity is lower though, as repairs are less resource-intense.</li>
<li>CRC configuration of the FPGA.</li>
</ul>
<h3>TSU Interconnection</h3>
<p>The interconnection is already present - it checks if both TSU BRF singals are synchronized. Whenever one is experiencing problems, it issues only an asynchronous dump, while the other one triggers both synchronous and asynchronous dumps. </p>
<h3>Other connections in the system</h3>
<p>The new TSU will get a watchdog, e.g., for when the clock stops or there is a power supply problem. </p>
<p>Connections between TSU and BIS, BETS, BLM and all others except for the External Trigger (used for a procedure of injecting and dumping directly - in the SPS, it's done via "Early Dump") as well. </p>
<p>Connection between TSU and TDB is fail-safe (6V, dump - goes to 12V, remove the plug - TDB/TDU trigger itself). Connections to TFO are pulse with active high (IPOC check if both are always sent, same for TFO -&gt; generators). On the LBDS (not SBDS), there is a feedback from TFO to TSU which ensures that each TFO received a trigger from both TSUs (after every pulse, there is a check in XPOC). </p>
<h2>Actions</h2>
<ol>
<li>Next meetings will be online, via Zoom - the recurring invitation needs to be updated.</li>
<li>Whenever the schematics of the design are ready, we can start the bottom-up FMECA analysis.</li>
</ol>