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Transition-Minimized
Differential Signaling (TMDS)
DVI makes use of
Transition-Minimized
Differential Signaling (TMDS)
wherein eight bits of video data
are converted to a 10-bit
transition-minimized,
DC-balanced value. This value
is then serialized and sent to
the receiver where the data is
de-serialized and converted back
to eight bits.
The three TMDS signals needed
for RGB make up one TMDS link.
A DVI connector can carry up to
two TMDS links providing for
better resolutions and timing
requirements. Single TMDS
link DVI cables can support
resolutions and timings that use
a video clock rate of about
25-165 MHz.
The following resolutions and
timings are supported by a
single link DVI cable:
SXGA resolution (1280 x
1024) with 85-Hz refresh
rate
UXGA resolution (1600 x
1200) with 60-Hz refresh
rate
SDTV resolutions of
480i, 480p, 576i and 576p
HDTV resolutions of 720p
and 1080i
Video clock rates of 165-330 MHz
on the other hand, are supported
only by dual TMDS link DVI
cables. With dual link DVI
cables, however, each TMDS link
operates at only one-half the
frequency of single link DVI.
So the clock and bandwidth is
shared by these two links.
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