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href="https://ca.wikipedia.org/wiki/TMDS" title="TMDS – Catalan" lang="ca" hreflang="ca" data-title="TMDS" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Transition-Minimized_Differential_Signaling" title="Transition-Minimized Differential Signaling – German" lang="de" hreflang="de" data-title="Transition-Minimized Differential Signaling" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/TMDS" title="TMDS – Estonian" lang="et" hreflang="et" data-title="TMDS" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/TMDS" title="TMDS – Spanish" lang="es" hreflang="es" data-title="TMDS" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Transition_Minimized_Differential_Signaling" title="Transition Minimized Differential Signaling – French" lang="fr" hreflang="fr" data-title="Transition Minimized Differential Signaling" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B3%80%ED%99%94_%EC%B5%9C%EC%86%8C%ED%99%94_%EC%B0%A8%EB%B6%84_%EC%8B%A0%ED%98%B8" title="변화 최소화 차분 신호 – Korean" lang="ko" hreflang="ko" data-title="변화 최소화 차분 신호" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Transition_Minimized_Differential_Signaling" title="Transition Minimized Differential Signaling – Dutch" lang="nl" hreflang="nl" data-title="Transition Minimized Differential Signaling" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Transition_Minimized_Differential_Signaling" title="Transition Minimized Differential Signaling – Japanese" lang="ja" hreflang="ja" data-title="Transition Minimized Differential Signaling" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Transition_Minimized_Differential_Signaling" title="Transition Minimized Differential Signaling – Polish" lang="pl" hreflang="pl" data-title="Transition Minimized Differential Signaling" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Transition-minimized_differential_signaling" title="Transition-minimized differential signaling – Simple English" lang="en-simple" hreflang="en-simple" data-title="Transition-minimized differential signaling" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/TMDS" title="TMDS – Ukrainian" lang="uk" hreflang="uk" data-title="TMDS" 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Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Transition-minimized+differential+signaling%22">"Transition-minimized differential signaling"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Transition-minimized+differential+signaling%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Transition-minimized+differential+signaling%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Transition-minimized+differential+signaling%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Transition-minimized+differential+signaling%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Transition-minimized+differential+signaling%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">October 2021</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Schematic_TMDS_link.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Schematic_TMDS_link.svg/440px-Schematic_TMDS_link.svg.png" decoding="async" width="440" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Schematic_TMDS_link.svg/660px-Schematic_TMDS_link.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Schematic_TMDS_link.svg/880px-Schematic_TMDS_link.svg.png 2x" data-file-width="830" data-file-height="310" /></a><figcaption>Schematic of a TMDS link used as a link for digital component video data (RGB) between a video controller (PC) and a display controller (Monitor) in interfaces such as DVI or HDMI</figcaption></figure> <p><b>Transition-minimized differential signaling</b> (<b>TMDS</b>) is a <a href="/wiki/Technological" class="mw-redirect" title="Technological"> technology</a> for transmitting high-speed <a href="/wiki/Serial_communication" title="Serial communication"> serial</a> <a href="/wiki/Data" title="Data">data</a> used by the <a href="/wiki/Digital_visual_interface" class="mw-redirect" title="Digital visual interface">DVI</a><sup id="cite_ref-DVI_1-0" class="reference"><a href="#cite_note-DVI-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/High-Definition_Multimedia_Interface" class="mw-redirect" title="High-Definition Multimedia Interface">HDMI</a> video interfaces, as well as by other digital communication interfaces. </p><p>The transmitter incorporates a coding algorithm which reduces <a href="/wiki/Electromagnetic_interference" title="Electromagnetic interference">electromagnetic interference</a> over copper cables and enables robust <a href="/wiki/Clock_recovery" title="Clock recovery">clock recovery</a> at the receiver to achieve high <a href="/wiki/Clock_skew" title="Clock skew">skew</a> tolerance for driving longer cables as well as shorter low-cost cables. </p> <div class="mw-heading mw-heading2"><h2 id="Coding">Coding</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transition-minimized_differential_signaling&action=edit&section=1" title="Edit section: Coding"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The method is a form of <a href="/wiki/8b/10b_encoding" title="8b/10b encoding">8b/10b encoding</a> but using a code-set that differs from the original IBM form. A two-stage process converts an input of 8 bits into a 10 bit code with particular desirable properties. In the first stage, the first bit is untransformed and each subsequent <a href="/wiki/Bit" title="Bit">bit</a> is either <a href="/wiki/Exclusive_or" title="Exclusive or">XOR</a> or <a href="/wiki/Exclusive_nor" class="mw-redirect" title="Exclusive nor">XNOR</a> transformed against the previous bit. The encoder chooses between XOR and XNOR by determining which will result in the fewest transitions; the ninth bit encodes which operation was used. In the second stage, the first eight bits are optionally inverted to even out the balance of ones and zeros and therefore the sustained average <a href="/wiki/Direct_current" title="Direct current">DC</a> level; the tenth bit encodes whether this inversion took place. </p><p>The 10-bit TMDS symbol can represent either an 8-bit data value during normal data transmission, or 2 bits of control signals during screen blanking. Of the 1,024 possible combinations of the 10 transmitted bits: </p> <ul><li>460 combinations are used to represent an 8-bit data value, as most of the 256 possible values have two encoded variants (some values have only one),</li> <li>4 combinations are used to represent 2 bits of control signals (C0 and C1 in the table below); unlike the data symbols these have such properties that they can be reliably recognized even if sync is lost and are therefore also used for synchronizing the decoder,</li> <li>2 combinations are used as a guard band before HDMI data,</li> <li>558 remaining combinations are reserved and forbidden.</li></ul> <p>Control data is encoded using the values in the table below. Control data characters are designed to have a large number (7) of transitions to help the receiver synchronize its clock with the transmitter clock. </p> <table class="wikitable" style="text-align:center;"> <caption>Control data encoding </caption> <tbody><tr> <th colspan="2">Input control bit</th> <th>Output<br />codeword<br /> </th></tr> <tr> <th>C0</th> <th>C1</th> <th>0 ... 9 </th></tr> <tr> <td>0</td> <td>0</td> <td>0010101011 </td></tr> <tr> <td>0</td> <td>1</td> <td>0010101010 </td></tr> <tr> <td>1</td> <td>0</td> <td>1101010100 </td></tr> <tr> <td>1</td> <td>1</td> <td>1101010101 </td></tr></tbody></table> <p>On Channel 0 the C0 and C1 bits encode the <a href="/wiki/Analog_television#Horizontal_synchronization" title="Analog television">Horizontal synchronization</a> (HSync) and <a href="/wiki/Analog_television#Vertical_synchronization" title="Analog television">Vertical synchronization</a> (VSync) signals. On the other channels they encode the CTL0 through CTL3 signals which are unused by DVI but in the case of HDMI are used as a preamble indicating the type of data about to be transferred (Video Data or Data Island), the <a href="/wiki/High-bandwidth_Digital_Content_Protection" title="High-bandwidth Digital Content Protection">HDCP</a> status and so on. </p><p>TMDS was developed by <a href="/wiki/Silicon_Image_Inc." class="mw-redirect" title="Silicon Image Inc.">Silicon Image Inc.</a> as a member of the <a href="/wiki/Digital_Display_Working_Group" title="Digital Display Working Group">Digital Display Working Group</a>. </p><p>TMDS is similar to <a href="/wiki/Low-voltage_differential_signaling" title="Low-voltage differential signaling">low-voltage differential signaling</a> (LVDS) in that it uses <a href="/wiki/Differential_signaling" class="mw-redirect" title="Differential signaling">differential signaling</a> to reduce <a href="/wiki/Electromagnetic_interference" title="Electromagnetic interference">electromagnetic interference</a> (EMI) which allows faster signal transfers with increased accuracy. TMDS also uses a <a href="/wiki/Twisted_pair" title="Twisted pair">twisted pair</a> for noise reduction, rather than <a href="/wiki/Coaxial_cable" title="Coaxial cable">coaxial cable</a> that is conventional for carrying video signals. Like LVDS, the data is transmitted serially over the data link. When transmitting video data and used in HDMI, three TMDS twisted pairs are used to transfer video data. Each of the three links corresponds to a different <a href="/wiki/RGB" class="mw-redirect" title="RGB">RGB</a> component. </p><p>The physical layer for TMDS is <a href="/wiki/Current_mode_logic" class="mw-redirect" title="Current mode logic">current mode logic</a> (CML),<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <a href="/wiki/DC_coupling" class="mw-redirect" title="DC coupling">DC coupled</a> and <a href="/wiki/Electrical_termination" title="Electrical termination">terminated</a> to 3.3 Volts. While the data is DC balanced (by the encoding algorithm), DC coupling is part of the specification. TMDS can be switched or repeated by any method applicable to CML signals. However, if DC coupling to the transmitter is not preserved, some transmitters' "monitor detection" features may not work properly. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transition-minimized_differential_signaling&action=edit&section=2" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/S/PDIF" title="S/PDIF">S/PDIF</a></li> <li><a href="/wiki/Low-voltage_differential_signaling" title="Low-voltage differential signaling">LVDS</a></li> <li><a href="/wiki/Display_controller" class="mw-redirect" title="Display controller">display controller</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transition-minimized_differential_signaling&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-DVI-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-DVI_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration 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.cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation cs2"><a rel="nofollow" class="external text" href="http://www.cs.unc.edu/Research/stc/FAQs/Video/dvi_spec-V1_0.pdf"><i>Digital Visual Interface</i></a> <span class="cs1-format">(PDF)</span>, <a href="/wiki/Digital_Display_Working_Group" title="Digital Display Working Group">Digital Display Working Group</a>, 1999-04-02, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20040423112052/http://www.cs.unc.edu/Research/stc/FAQs/Video/dvi_spec-V1_0.pdf">archived</a> <span class="cs1-format">(PDF)</span> from the original on 2004-04-23</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Digital+Visual+Interface&rft.pub=Digital+Display+Working+Group&rft.date=1999-04-02&rft_id=http%3A%2F%2Fwww.cs.unc.edu%2FResearch%2Fstc%2FFAQs%2FVideo%2Fdvi_spec-V1_0.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATransition-minimized+differential+signaling" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.ti.com/lit/ds/symlink/ds34rt5110.pdf">DS34RT5110 DVI, HDMI Retimer with Input Equalization and Output De-Emphasis</a></span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Transition-minimized_differential_signaling&oldid=1271775129">https://en.wikipedia.org/w/index.php?title=Transition-minimized_differential_signaling&oldid=1271775129</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Digital_display_connectors" title="Category:Digital display connectors">Digital display connectors</a></li><li><a href="/wiki/Category:Line_codes" title="Category:Line codes">Line codes</a></li></ul></div><div 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