Mitsubishi V19-V21, Техническое руководство

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6-8
The DM µPC communicates with the TV µPC through
the System Interface and UART (Universal Asynchro-
nous Receiver Transmitter) circuitry. Data from the TV
µPC is received over the TV DM TXD line, and data is
sent to the TV µPC over the TV DM RXD line. The
TV DM CTS and TV DM RTS are Clear to Transmit
and Request to Transmit, respectively. They are used
to provide slow control on RXD and TXD lines.
The DM µPC, through the System Interface, con-
trols the:
• ATSC/QAM Tuner/Demodulator
• MPEG Decoder
• OSD Generator
• IR µPC
The ATSC/QAM Tuner receives and processes Digi-
tal HD, SD and QAM (digital cable) Signals. The
output is the Transport Data Stream, directed to the
MPEG Decoder through the System Interface.
The MPEG Decoder processes the Transport Data
Stream and outputs analog RGB signals.
All On Screen Display (OSD) signals, except Conver-
gence OSD, are generated in the DM OSD circuit.
When the main picture source is digital, from the ATV
Tuner or 1394 Jacks, the OSD is inserted in the DM
Module.
When the main picture source is analog, the OSD
signals are output from the MPEG circuit and in-
serted in the main picture in the VCJ IC.
The IR µPC receives remote signals from the TV
µPC over the IR IN/BUSY line. The signals are
decoded and directed to the System 5 IR Outputs
for controlling Home Theater components.
It was previously mentioned that the 1394 Jacks were
the source of Digital Signals. When digital compo-
nents in a Home Theater setup are IEEE 1394 com-
patible, a single four lead cable connection is all that
is required.
Two of the IEEE 1394 cable leads are data lines, and
two are control lines. The IEEE 1394 system en-