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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
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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
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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
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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
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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
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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:
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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.
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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
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DS34RT5110 DVI, HDMI Retimer with Input
Equalization and Output De-Emphasis
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tolerance for driving longer cables as well as shorter low-cost cables.
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The transmitter incorporates an advanced coding algorithm which reduces
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video interfaces, as well as by other digital communication interfaces.
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level; the tenth bit encodes whether this inversion took place.
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2 combinations are used as a guard band before HDMI data,
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558 remaining combinations are reserved and forbidden.
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58:"Transition-minimized differential signaling"
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299:On Channel 0 the C0 and C1 bits encode the
130:Transition-minimized differential signaling
109:Learn how and when to remove this message
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162:over copper cables and enables robust
16:Digital serial communication standard
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47:adding citations to reliable sources
327:low-voltage differential signaling
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341:for noise reduction, rather than
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166:at the receiver to achieve high
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424:from the original on 2004-04-23
353:The physical layer for TMDS is
34:needs additional citations for
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415:Digital Display Working Group
320:Digital Display Working Group
335:electromagnetic interference
160:electromagnetic interference
140:for transmitting high-speed
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301:Horizontal synchronization
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305:Vertical synchronization
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314:TMDS was developed by
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43:improve this article
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325:TMDS is similar to
318:as a member of the
311:status and so on.
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355:current mode logic
316:Silicon Image Inc.
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41:Please help
36:verification
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350:component.
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458:Line codes
447:Categories
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363:terminated
359:DC coupled
333:to reduce
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138:technology
69:newspapers
419:archived
370:See also
249:0 ... 9
237:codeword
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357:(CML),
136:) is a
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