ViewSonic N3260wM, Service Manual

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B.
CATV Input Connector
：
Connecting to your coaxial cable from local TV station.
z Tuner TUV1236D receive the signal come from CATV signal
，
Selects desired channel and
demodulate image composite signal (signal mark T1CVBS) by pin 14 of Tuner output to U19 PW328
VDC decoder via C224 and audio SIF signal (signal mark T1SND) by pin 15 of Tuner output to U29
MSP4450G via C396 for demodulating MTS/SAP.
MPEG Processor PW2000:
When MPEG Transport Stream data input U35 PW2000 internal decoder Separates MPEG video and
AC3 digital audio .The digital video output from PW2000 Digital Video Signal Output port (44 Pins) to U19
PW328 digital input port(port 1) . The digital audio output via I2S bus (MPEG_CL, MPEG_WS, I2S_DI1)
to the externally connected DA converter( U29 MSP4450G). Each of these functions was described in
more detail in the sections that follow.
z
System Control
The PWM2000 incorporates a TX49
core
core (
64-bit MCU
core
)
and a CRISC (
Control 32-bit RISC
processor
) for system control. The TX49 core issues instructions to the CRISC as well as to the
peripheral controllers such as PCIC (
PCI Controller)
, USB, and UART. Based on the instructions sent
from the TX49 core, the CRISC controls decoders such as video (VDEC), and audio (AUDIO),
System Control Detail Block Diagram
z United Memory
DDR SDRAM ( U42,U43,U44,U45 ) is externally connected to the PWM2000. In addition to the
CRISC and TX49 core, the unified memory allows all internal decoders can share data via VMMS
(
Virtual Multi-port Memory System ,Controls external DDR-SDRAM 64 bits) ,
which reduces external memory
types and capacities.
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