Philips L04E Service Manual page 80

EN 80 9.
9.3
PNx83xx MOJO
The MOJO is a source decoder chip targeted for very low cost
application in integrated digital televisions.The device contains
all hardware and software to be able to decode and display
MPEG2 transport streams, including:
•
Descrambling
•
Demultiplexing
•
Audio / video decompression
•
Video encoding.
•
Overlay graphics provisions
Some features of the MOJO are:
•
32-bit PR1910 core operating at 120 MHz.
•
16-bit memory and peripheral interface to connect ROM,
NOR Flash and various peripherals.
•
Sixteen external interrupt inputs shared with PIO lines.
•
Several embedded peripheral units with physical interfaces
to:
–
Two UART (RS-232) data ports
–
Two I2C master / slave transceivers
–
Two smart-card reader interfaces
–
One Integrated Conditional Access Module interface
•
Supports parallel and serial transport stream input
interfaces
9.4
Front End
The front end of the "IBO Zapper" module is almost identical to
the "IBO+" module as used in the A10E with the exception that
the Transport Streams that come from the COFDM
demodulator are now fed through the PCMCIA controller first.
The PCMCIA controller receives encrypted Transport Streams
from the COFDM demodulator. Via the PCMCIA card, these
encrypted Transport Streams are decrypted, and transported
to the MOJO.
9.5
Back End
The MOJO is the main building block of the back-end of the
"IBO Zapper" module. The IC decodes the MPEG-2 stream into
analogue video and digital audio.
9.5.1
Transport Stream Input
The Transport Stream input is according to MPEG2 standard.
In the "IBO Zapper", only 8-bit parallel is supported. The used
TS names are TDA_DATA.
9.5.2
Video Outputs
The MOJO has two analogue video outputs:
•
Primary (TV): YUV +CVBSsync
•
Secundary (VCR): CVBS
The primary output is used for TV display and is fed via the LTI/
CTI panel to the YUV input of the Hercules IC (pins 57, 58, 59).
The secundary output is used for recording via the SCART 2
ouptut of the TV. The Hercules can switch the SC2_CVBS_out
signal at pin 19 of SCART 2 between the output of the
IBOZapper and the SCART 2 output of the Hercules. This is
done via the SEL_SC2_INTF signal and the circuitry around
T7602 at schematic A5.
9.5.3
Audio Outputs
The MOJO has two audio output interfaces:
•
SPDIF Out: The SPDIF sound output goes directly to a
connector on the back of the module.
L04E AB Circuit Descriptions, List of Abbreviations, and IC Data Sheets
•
I2S Out: This digital sound output is fed through a DAC and
the analogue L/R signals are directely fed into the
Hercules.
9.6
IBOLink Interface
The IBOLink™ approach is such that the conventional TV
microcontroller is re-used when digital functionality is added. In
principle, the TV can still operate without the bolt-on module.
The IBOLink™ software is added to the TV-set software, and is
operating as a software bridge.
9.7
Control Interface
The "IBO Zapper" is connected as a slave I2C device, The I2C
bus should be +5V tolerable and operating at 100kHz(MAX).
The "IBO Zapper" module slave address is 0xE4 (similar to
IBO+) but is configurable via IBOLink.
All communication from digital module to Television chassis
has to be initiated via an active low hardware interrupt line from
the digital module.
9.8
UART Interface
The UART interfaces (Universal Asynchronous Receiver And
Transmitter) are serial interfaces, which are used to transfer
data and commands between two devices.
The "IBO Zapper" system uses an UART interface for serial
communication with a pc for:
•
Diagnostic SW for Service or Production
•
SW uploading for Service or Development
9.9
Power Supply
The "IBO Zapper" module operates from a single 12V supply
provided by the TV chassis. All other voltages that the module
needs are derived from the +12V. The module has four
different physical power states:
•
"Off" State.
•
"Passive Standby".
•
"Active Standby".
•
"On" State.
9.9.1
Off State
The set is powered off via the main power switch. The module
is not powered.
9.9.2
Passive Standby State
The set is in standby mode. The module is in off state.
9.9.3
Active Standby State
The set is in "Semi-Standby" mode. All the circuits in the set,
except the audio output and deflection (and thus the CRT
display) are powered up and fully active. The set appears to be
in normal standby mode for the customer.
To implement this mode, the horizontal deflection drive output
of the Hercules IC is disabled but the Stdby_Con control port is
held at logic zero. This causes the Line Output Stage to be
inactive and thus the EHT is cut off (this causes the CRT to be
inactive) while the Vbatt voltage is still present.