Circuit Descriptions
EN 51
Q552.2L LA
7.
2011-Jul-15
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Figure 7-4 Front-End block diagram Brazil region
7.5
Front-End DVB-S(2) reception
The Front-End for the DVB-S(2) application consist of the
following key components:
•
Satellite Tuner; I
2
C address 0xC6 (bridged via channel
decoder)
•
Channel decoder; I
2
C address 0xD0
•
LNB switching regulator; I
2
C address 0x14
•
Amplifier
•
PNX855xx SoC TV processor with integrated DVB-T and
DVB-C channel decoder and analogue demodulator.
Below find a block diagram of the front-end application for
DVB-S(2) reception.
Figure 7-5 Front-End block diagram DVB-S(2) reception
This application supports the following protocols:
•
Polarization selection via supply voltage (18V = horizontal,
13V = vertical)
•
Band selection via “toneburst” (22 kHz): tone “on” = “high”
band, tone “off” = “low” band
•
Satellite (LNB) selection via DiSEqC 1.0 protocol
•
Reception of DVB-S (supporting QPSK encoded signals)
and DVB-S2 (supporting QPSK, 8PSK, 16APSK and
32APSK encoded signals), introducing LDPC low-density
parity check techniques.
7.6
HDMI
In this platform, the Silicon Image Sil9x87 HDMI multiplexer is
implemented. Refer to figure
7-6 HDMI input configuration
for
the application.
Figure 7-6 HDMI input configuration
The following multiplexers can be used:
•
Sil9187A (does not support “Instaport” technology for fast
switching between input signals)
•
Sil9287B (supports “Instaport” technology for fast
switching between input signals).
The hardware default I
2
C addresses are:
•
Sil9187A: 0xB0/0xB2 (random: software workaround)
•
Sil9287B: 0xB2 (fixed).
The Sil9x87 has the following specifications:
•
+5V detection mechanism
•
Stable clock detection mechanism
•
Integrated EDID
•
RT control
•
HPD control
•
Sync detection
•
TMDS output control
•
CEC control
•
EDID stored in Sil9x87, therefore there are no EDID pins
on the SSB.
7.7
Video and Audio Processing - PNX855xx
The PNX855xx is the main audio and video processor (or
System-on-Chip) for this platform. It has the following features:
•
Multi-standard digital video decoder (MPEG-2, H.264,
MPEG-4)
•
Integrated DVB-T/DVB-C channel decoder
•
Integrated CI+
•
Integrated motion accurate picture processing (MAPP2)
•
High definition ME/MC
•
2D LED backlight dimming option
•
Embedded HDMI HDCP keys
•
Extended colour gamut and colour booster
•
Integrated USB2.0 host controller
•
Improved MPEG artefact reduction compared with
PNX8543
•
Security for customers own code/settings (secure flash).
The TV550 combines front-end video processing functions,
such as DVB-T channel decoding, MPEG-2/H.264 decode,
analog video decode and HDMI reception, with advanced
back-end video picture improvements. It also includes next
generation Motion Accurate Picture Processing (MAPP2). The
MAPP2 technology provides state-of-the-art motion artifact
reduction with movie judder cancellation, motion sharpness
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