5. ICMP
• DisplayPort A and DisplayP ort B autom atically detect:
- Ac tive Pixels, and Active Lines
- Vertical Refresh
- 8 bits/color - 10 bits/color
- Frame lock ed
• All input resolutions are scaled towards the desired resolution specified in the screen presentation file.
• Fractional frame ra tes = (Hz*1000)/1001
5.6 ICMP SDI specifications
3G-SDI
Serial Digital Interface (SDI) is a s erial link standardized by ITU-R BT.656 and the Society of M otion Picture and Tele-
vision Engineers (SMPT E). SDI trans mits un comp ressed digital video over 75-ohm coax ial cable within studios, and
is seen on most profe ssional video infrastructure equipm ent. The first revision of the standard, SMPTE 259M, was
defined to carry digital representation of analog v ideo such as NTS C and PAL over a serial interface and is m ore pop-
ularly known as standard-defi nition (SD) S DI. The data rate required to transmit SD SDI is 270 Mbps. With the advent
of high-definition (HD) video standards such as 1080i and 7 20p, the interface was scaled to handle higher data r
ates
of 1.485 Gbps. The 1.485-Gbps serial interface is commonly called the HD SDI interface and is defined by SMPTE
292M, using the same 75-ohm coaxial c able. S tudios and other video production facilities h ave invested heavily on
the hardware infrastructure for coaxial cable and have a ves ted interest in ex
tending the life of their infrastructure. For-
tunately, SMPTE recently ratified a new standard called S MPT E 424M that doubles the SDI data rates to 2.97 Gbps
using the sam e 75-ohm coaxial cable. T his new standard, also called 3-Gbps (3G)-SDI, enables higher resolution of
picture quality required for 1080p and digital cinema.
SDI terminology
Standard HD-SDI sig nal
Single Link
1.5Gb/s HD 4:2:2
Standard HD-SDI allows for a single 4:2:2 im age to be carried on on e cable at 1.485 Gb/s. The image uses the Y Cb Cr colorspace
and uses a bit depth of 10 bit per c olor component.
Due to the data rate limitations only 23.976, 24, 25, 29.970 and 3 0 fps streams are ach ievable.
Dual-Link HD-SDI signal
Dual Link
1.5Gb/s
1.5Gb/s
1080p 50/60
1
or
1080p 4:4:4
Dual-Link HD-SDI is mainly two standard HD-SD I signals carrying a single im age stream s plit between the two cables. The m ain
advantage is that color subsampling is no longer required, and the image can be transmitted in 4:4:4 quality, wh ich then also allows
the RG B (or X YZ ) color space to be used.
The main link will c ontain a standard HD-SD I s ignal, the second (enhancement) link contains the missing Cb and Cr samples.
Depending on the implem entation the enhancem ent link could also contain extra information to increase the bit depth.
3G H D-SD I signal
3G
3Gb/s
1080p 50/60 (Level A)
or
1080p 4:4:4 (Level B)
1. Not supported in Alchemy
38 R5906787 THOR 26/01/2018
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