Daewoo DTC-14D9 series, Service Manual

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11. IC DESCRIPTION
VCT 38xxA/B
1. Introduction
The VCT 38xxA/B is an IC family of high-quality single-
chip TV processors. Modular design and a submicron
technology allow the economic integration of features
in all classes of TV sets. The VCT 38xxA/B family is
based on functional blocks contained and approved in
existing products like VDP 3120B, TPU 3050S, and
CCZ 3005K.
Each member of the family contains the entire
video,display, and deflection processing for 4:3 and
16:9 50/ 60-Hz TV sets. The integrated microcontroller
is sup-ported by a powerful OSD generator with
integrated teletext acquisition which can be upgraded
with on-chip page memory. With volume control and
audio input select the basic audio features for mono TV
sets are integrated. An overview of the VCT 38xxA/B
sin-gle-chip TV processor family is given in Fig. 1–1 on
page 7.
The VCT 38xxA/B family offers a rich feature set, cov-
ering the whole range of state-of-the-art 50/60-Hz TV
applications.
In comparison to the VCT 38xxA the VCT 38xxB offers
the following features:
– one additional composite video input
– analog luma/chroma adder for video output
– closed caption module
– additional 12k character ROM
VIN
VR
T
SGND VSUP
AF
GNDAF VSUPD GNDD VER
T
EW PROT HOUT HFLB SENSE RSW GNDM VRD XREF
Video
Front-end
Comb
Filter
Color
Decoder
Panorama
Scaler
Display
Processor
Pict. Improv
Video
Back-end
Audio
CIN
VOUT
4
2 2 2
3
4
2
2
3
3
RGBOUT
SVM
RGBIN
VSUPAB
GNDAB
AOUT
AIN
I
2
C
I
2
C Master
I
2
C
MSync
Color, Prio
VSync
8-bit PWM
14-bit PWM
15:1 Mux
10-bit ACD
2 Timer
2 CapCom
96 kB
CPU ROM
ADB, DB, CB
16 kB
Text
RAM
3 kB
OSD RAM
TPU
V
ideo
24 kB ROM
31
12
1 kB
CPU RAM
CPU DMA
8
BE
RDY
Watchdog
24 IO Ports
RESQ
TEST
XTAL1
XTAL2
CLK20
CNDP1
VSUPP1
Pxy
GNDS
VSUPS
Clock
Oscillator
Reset
Logic
VCT 38xxA/B
2. Chip Architecture