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Functional Description
20G214-00 E2
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2017-03-07 Page 19
3.4.2 Connection of Displays
3.4.2.1 Daisy-Chaining Displays
The DisplayPort 1.2 interfaces simplify connecting displays with multi-streaming
technology (MST). MST enables daisy-chaining of displays compatible with DisplayPort
1.2 and the use of MST hubs to drive multiple displays via one DisplayPort connector.
The resolution for each display connected via MST is limited by the maximum pixel rate
for a single link. The tables below show the maximum megapixels per second for
DisplayPort links using all four DisplayPort lanes.
Table 6. Maximum pixel rates at 5.4 GHz link rate (DisplayPort 1.2)
For example, a single DisplayPort 1.2 link can support two 2560 x 1600 displays at 60Hz
and 30 bpp with one cable.
Table 7. Maximum pixel rates at 2.7 GHz link rate (DisplayPort 1.1a)
3.4.2.2 Cable Length
The cable length affects the bandwidth for signal transmission. To have the best display
resolution available, connect displays with cables as short as possible. Depending on the
application, either use passive or active cables. Passive cables are suitable, e.g., for short
connections between displays. High display resolutions over longer distances require
higher grade active cables.
It is recommended to use only VESA certified cables.
A DisplayPort 1.1a compatible display in the daisy-chain has to be the last
member of the chain, since it has no DisplayPort output available.
Color depth
in bits per pixel
Maximum
pixel rate
18 bpp 957 MP/s
24 bpp 718 MP/s
30 bpp 574 MP/s
Color depth
in bits per pixel
Maximum
pixel rate
18 bpp 478 MP/s
24 bpp 359 MP/s
30 bpp 287 MP/s
See the DisplayPort website for verified cables:
www.displayport.org