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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[MCPE-21790] Rs Nor Latches unstable</title>
                <link>https://bugs.mojang.com/browse/MCPE-21790</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;RS Nor latches will pulse in an infinite loop causing a 100% CPU spike when they receive the invalid state of R=1 and S=1.  Trying to set S=1 R=0 will not break the infinite loop.  You have to manually break the redstone on the RS Nor latch.  This bug does not occur on the PC version of Minecraft.&lt;/p&gt;

&lt;p&gt;As seen in the first attached image, if you flip the lever on the control wire which simultaneously powers R and S, the latch will glitch and loop infinitely causing a CPU spike to 100% usage.  My phone will lag horribly.&lt;/p&gt;

&lt;p&gt;This issue can also occur using only a Set pulse (using a lever, not a button or exact 1 tick pulse) which is a valid state for an RS Nor Latch or when chunks load on restarting the world.&lt;/p&gt;

&lt;p&gt;I have had to replace all of my RS Nor latches with redstone repeater latches in order to make progress on my computer.&lt;/p&gt;

&lt;p&gt;Second image for anyone interested:&lt;br/&gt;
Red wire - ALU&lt;br/&gt;
Yellow wire - Clock and initialization&lt;br/&gt;
Bottom left (under item bar) - 6 bit Program counter&lt;br/&gt;
Bottom right - Multiplexer to 64 lines of program memory (Harvard architecture)&lt;br/&gt;
Top right orange - 10 bit instruction decoder (4 bit opcode - 6 bit parameter)&lt;br/&gt;
Green - CPU control lines&lt;br/&gt;
Top orange - 16 bytes of 4 bit memory&lt;br/&gt;
Bottom left - 4 bytes of dual read registers&lt;br/&gt;
Top left green - Multiplexer for ram addressing&lt;/p&gt;</description>
            <key id="170166">MCPE-21790</key>
            <summary>Rs Nor Latches unstable</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="5">Cannot Reproduce</resolution>
                                            <reporter username="br.teague">Brian Teague</reporter>
                        <labels>
                    </labels>
                <created>Sat, 6 May 2017 08:07:39 +0200</created>
                <updated>Wed, 9 May 2018 10:23:20 +0200</updated>
                            <resolved>Wed, 9 May 2018 10:23:20 +0200</resolved>
                                    <version>1.1.0.9</version>
                    <version>1.0.8.1</version>
                                                                        <votes>1</votes>
                                    <watches>0</watches>
                                                                            <comments>
                            <comment id="451109" author="mega_spud" created="Wed, 9 May 2018 10:23:20 +0200"  >&lt;p&gt;Cleaning up old tickets:  This ticket has not been updated recently (1 year+) so is being closed as &lt;em&gt;Cannot Reproduce&lt;/em&gt;.  If you feel this is still a valid issue then please comment, or create a new ticket following the &lt;a href=&quot;http://help.mojang.com/customer/portal/articles/801354-writing-helpful-bug-reports-for-minecraft&quot; title=&quot;How To Write helpful bug reports&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Issue Guidelines&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Quick Links&lt;/b&gt;:&lt;br/&gt;
&#128211; &lt;a href=&quot;http://help.mojang.com/customer/portal/articles/801354-writing-helpful-bug-reports-for-minecraft&quot; title=&quot;How To Write Awesome Tickets! &#128175;&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Issue Guidelines&lt;/a&gt; &amp;#8211; &#128172; &lt;a href=&quot;https://www.reddit.com/r/MCPE/&quot; title=&quot;Help From the Minecraft Community &#128377;&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Community Support&lt;/a&gt; &amp;#8211; &#128231; &lt;a href=&quot;https://feedback.minecraft.net/&quot; title=&quot;Feedback and Suggestions &#9997;&#65039;&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Feedback&lt;/a&gt; &amp;#8211; &#128214; &lt;a href=&quot;http://minecraft.gamepedia.com/Minecraft_Wiki&quot; title=&quot;Official Minecraft Wiki &#127891;&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Game Wiki&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="381801" author="br.teague@gmail.com" created="Sun, 7 May 2017 02:40:46 +0200"  >&lt;p&gt;World with the RS nor latch bug has been uploaded 5TQAABmLAQA=.zip&lt;br/&gt;
Also replaced images with higher resolution.&lt;/p&gt;

&lt;p&gt;World with the computer is 9QEAALHuAgA= but all RS Nor latches have been removed from this world because of the issues they were causing.&lt;/p&gt;</comment>
                            <comment id="381700" author="mega_spud" created="Sat, 6 May 2017 09:28:04 +0200"  >&lt;p&gt;If you could upload a copy of the world it would be useful in testing out this bug further.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="138995" name="5TQAABmLAQA=.zip" size="59244" author="br.teague" created="Sun, 7 May 2017 02:39:03 +0200"/>
                            <attachment id="138998" name="9QEAALHuAgA=.zip" size="482277" author="br.teague" created="Sun, 7 May 2017 02:46:47 +0200"/>
                            <attachment id="138996" name="IMG_0404.PNG" size="677049" author="br.teague" created="Sun, 7 May 2017 02:44:30 +0200"/>
                            <attachment id="138997" name="IMG_0405.PNG" size="1140560" author="br.teague" created="Sun, 7 May 2017 02:44:30 +0200"/>
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