Daewoo DQD-2100D, Service Manual

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CIRCUIT OPERATIONAL DESCRIPTION
CPU
DMA
Controller
Interrupt
Control
Unit
10-bit
A/D converter
(4 ch)
BUS
Converter
BUS
Controller
DRAM
Controller
Port 0 to
Port 3
BUS
Signal
Data
Memory
Data
UART(3ch)
INT 0 to
INT 5
AN 0 to
AN 3
SIO-SI2
SOO-SO2
SCO-SC2
A/V
Interface
Data A/V
Interface
Port
Picture 3. [CPU Block Diagram]
3. U-COM: ZR36703(IC 500)
1) Overview
IC500 (ZR36703) controls the overall MPEG B/D, and receives DATA from Flash Memory and displays
Logo screen, and controls MPEG Decoder to output Video/Audio signal by decoding MPEG format. It
also controls OSD display such as Setup related to DVD.
2) Input/Output terminal
* Input:It receives DVD MPEG Data inputted from Loader, Data inputted from Memory and interface
Data from IC (MPEG Decoder etc.).
* Output: It outputs Control Data of each IC and Interface Data
3) Internal BLOCK DIAGRAM
4. Other IC
1) Flash Memory: SST 39VF400A (IC 502)
It stores all programs for DVD operation and OSD language/Logo Screen Data, and transmits Data
requested by CPU. The advantage of Flash Memory is that it can be updated without exchanging.
2) SDRAM: GLT5160I16-7
It executes video signal processing exchanging Data with MPEG Decoder. All the video signals
transmitted from DVD go to SDRAM first, then through Video Encoder at MPEG Decoder and outputted
finally as analog signals.