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Circuit Descriptions and List of Abbreviations

EN 71

FM242 AA

9.1.1

Input/Output

The main inputs are:
•

Basic: VGA only,

•

Enhanced: VGA, Flex-VGA, DVI-D, HD-RGB+HV, HD-
2fH-YPbPr (sync on Y), 1fH-YCbCr (sync on Y), YC, CVBS
on cinch. Flex-VGA gives the user a choice to configure the
'loop-through VGA output' as an output or as input.

9.1.2

Video

This mainly consists of an analogue processing part and a
digital processing part. The video inputs like VGA (Basic
configuration), CVBS, YC, HD-RGB/YUV (1fH and 2fH) and
DVI-D are received and processed.
The VGA signals are first converted to digital signals and then
processed by the PW Scaler.

The YPbPr (2fH) signal is discretely converted to RGB,
whereas the YCbCr (1fH) signal is processed in the SAA7118
Digital Video decoder.

The base-band video inputs (CVBS and YC) are output from
this decoder as digital YUV, which are then further processed
by the Pixel Works Scaler (PW).

The signals on the digital DVI input are first decoded by the
TMDS decoder inside the AD9887 and then processed by the
PW Scaler.

The PW Scaler output is going through an EPLD and then via
an LVDS Encoder to the SDI PDP (Plasma Display Panel) as
differential serial data. This PDP has a resolution of 852(H) x
480 (V) pixels.

9.1.3

Audio

This mainly hosts the audio inputs for the various video inputs.
They go through an I

C controlled source selector. The main

audio processing is done by the Micronas MSP3415G version
with built-in UltraBass-II algorithm.

A digital delay line is created using the I

S channel and SRAM.

The delay created can be selected between two values, one for
the Receiver box, and one for the Monitor.

The processed audio signals are then differentially transmitted
to the audio amplifier panel. This amplifier drives a tweeter and
a twin-drive woofer (low/mid range). Active filtering is done
prior to the amplifiers.

9.1.4

Control

The main controller is the OTC, referred to as the 'main
processor'. This operates in co-ordination with the processor in
the Pixel Works Scaler (PW), referred to as the 'co-processor'.

When the FM242 monitor is connected to an F21R Receiver
box, the UART commands from the Receiver box will control
the monitor.

In stand-alone mode, the monitor can be controlled via the
Remote Control or via the RS232C port.

DDC1/2B (Digital Data Channel, an I

C-based protocol) is

implemented with separate identification NVMs for the two
VGA inputs and the DVI-D input as well. In addition, the
RS232C port can be used for software download to the PW and
the OTC. The target for downloading is controlled via a switch
in the RS232C path; the switch itself is controlled by the OTC.

9.1.5

Power Supply

Figure 9-2 Power Supply Path

Audio processing

Audio amplifier

RC/LED/switch panel

3D Comb*

PixelWorks

PW164_10R or 10RK

Video Scaling
Co-processor

OTC

Main Processor