
Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
VL
Variable Level out: processed audio
output toward external amplifier
VCR
Video Cassette Recorder
VGA
Video Graphics Array
WD
Watch Dog
WYSIWYR
What You See Is What You Record:
record selection that follows main
picture and sound
XTAL
Quartz crystal
Y
Luminance signal
YPbPr
Component video (Y= Luminance, Pb/
Pr= Colour difference signals)
Y/C
Luminance (Y) and Chrominance (C)
signal
Y-OUT
Luminance-signal
YUV
Component video
9.11 IC Data Sheets
This section shows the internal block diagrams and pin layouts
of ICs that are drawn as "black boxes" in the electrical diagrams
(with the exception of "memory" and "logic" ICs).
9.11.1 Diagram A7, Type GM5221 (IC7401)
Figure 9-5 Internal Block diagram
gm5221 Functional Block Diagram
GPIO
LVDS
Panel I/F
Analog
YUV/RGB
Triple
ADC&PLL
Parallel or Serial
EEPROM
X86
Micro-controller
External
ROM I/F
/
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ut
p
a
C
e
g
a
mI
t
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e
m
er
u
s
a
e
M
XTAL
Clock
Generation
On-chip
RAM / ROM
Ultra-
Reliable
DVI Rx
HDCP
DVI
OSD
Controller
NVRAM
Display
Timing
Control
Test
Pattern
Generator
BT 656
2 X
LVDS
Tx
Keypad Sensing
Temp Sensor
3 X General-
Purpose ADC
4 X
PWM
Back-light
Audio
™
g
ni
s
s
e
c
or
P
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g
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gil
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et
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etl
i
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k
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h
S /
m
o
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Z
t
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g
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hti
w
uv
Y
st
n
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mt
s
uj
d
A
r
ol
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C l
ati
gi
D
Reset CCT
422 to 444
Conversion
High-light Window
el
b
a
T-
p
u-
k
o
o
L
r
ol
o
C
ACC
Luma
Shaping
ACM-II
Chroma
Adjust
Histogram
n
oi
sr
e
v
n
o
C
e
c
a
p
S
r
ol
o
C
DDC2Bi
Schmitt
Tri gg er
DDC2Bi
Resetn
Serial
Master
GPIO
E_14520_049.eps
011104