Sharp LC-40LS340E, Service Manual

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5. MICROCONTROLLER(Broadcom)
BCM3556
a) General Description
The BCM3556 is the next generation of System-on-a-Chip (SoC) Digital Television (DTV)
products from Broadcom® with 1080p60 input and output capability targetedfor the EU
Market. It combines a high level of integration with best-of-class picture quality, enabling TV
manufacturers to reduce overall system cost (BOM) and improve picture quality, all with a
single SoC.
The BCM3556 combines DVB-T COFDM terrestrial and PAL/SECAM demodulators, two
DVI/HDMI receivers, a transport processor, a digital audio processor, 3D/2D graphics
processing, Ethernet MAC and PHY, digital processing of analog video and audio, analog
video digitizer and DAC functions, stereo high-fidelity audio DACs, a 400-MHz dual-
threaded MIPS processor, and a peripheral control unit providing a variety of television
control functions. The BCM3556 also features an advanced video decoder
capable of supporting high-definition AVC, VC-1, and DVB-T MPEG-2 streams.
The integration of the DVB-T COFDM terrestrial demodulator reduces the overall cost of the
external tuner module, resulting in cost savings for the customer. The BCM3556also
integrates four 10-bit ADCs with integrated front-end analog muxing that accept four CVBS
inputs, three S-video inputs, three component inputs, one PC input, one full SCART input
with fast blanking, and one Sound IF (SIF) input at the same time without the requirement for
any off-chip muxing ICs. The BCM3556 offers two HDMI 1.3a receivers, a motion adaptive
deinterlacer, HD Analog Noise Reduction, and an analog video decoder with 3D comb for
PAL and Y/C separation for SECAM.
The multiformat video decoder in the BCM3556 is capable of supporting high-definition
AVC, VC-1, and DVB-T MPEG-2 streams. AVC support is up to High Profile Level 4.1.
New tools in the AVC Fidelity Range extensions are supported, including 8x8 transform and
spatial prediction modes and adaptive quantization matrix. The video decoder also supports
high-definition VC-1 (Advanced Profile Level 3, Main, and Simple profiles) and DVB-
Tcompliant MPEG-2, Main Profile at Main and High Levels. The BCM3556 has an advanced
programmable audio processor capable of decoding a broad range of formats including Dolby
Digital, Dolby Digital Plus, AAC 5.1, AAC+ Level 2, AAC+ Level 4, WMA, and MPEG-1
Layer 1, 2, and 3 with simultaneous pass-through support.
The BCM3556 also supports 3D SRS Audio and includes an analog audio decoder for BTSC
and A2 formats. The BCM3556 also integrates an analog audio switch that accepts six stereo
inputs. In addition, the SoC supports SPDIF and I2S inputs. One SPDIF, two I2S, and three
analog audio outputs are available.
The SoC family also has an integrated advanced Picture Enhancement Processor (PEP) to
improve sharpening and perform picture post-processing functions (e.g., autoflesh, green
boost, black and blue stretch). The PEP engine is fully programmable and can be optimized
by the TV manufacturer to meet their respective quality requirements. Also integrated is a
video encoder for NTSC and an advanced 2D/3D graphics for OSD acceleration.
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