Chapter 7. Major Ic Informations; Major Ic Informations - Sharp LC-32D50U Service Manual

LC-32D50U
CHAPTER 7.

MAJOR IC INFORMATIONS

[1] MAJOR IC INFORMATIONS
• IC8101 (RH-IXB145WJQZQ)
An LSI of a MPEG-2 system decoder that performs back-end processing for digital broadcasting. This is equipped with a CPU (processor core:
AM33-3), descrambler (DES), transport stream demultiplexer, video decoder (MPEG-2 MP @ HL compatible), graphic processor, audio decoder
(AC3 compatible), and an NTSC video encoder.
After receiving transport stream from the tuner, the LSI decrypts pay-TV broadcasts with the descrambler. Then using the demultiplexer, it sepa-
rates and decodes the compressed audio and video data to send the signals. In the visual system, the graphic processor makes it possible to
overlap subtitles and perform scaling. Digital video signals (Y, Pb and Pr, or 480I/P, 720P and 1081I) and downconverted NTSC signals (Y/C and
composite, or 480I) can be sent simultaneously. As for the audio system, decoded AC3 audio can be overlapped with sound effects.
The LSI also contains various interfaces (I2C x 2, UART x 3, an SD Memory Card interface, a CableCARD interface, etc.) and a GPIO. Using
these interfaces, the CPU controls peripheral circuits of the tuner, SD Memory Cards, CableCARDs, etc. One of the UARTs is used by the CPU to
establish communications with the monitor microcomputer in the unit, where remote control information or other data is exchanged. Another UART
is used for RS-232C serial communications to connect the unit to a PC.
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