ViewSonic VG150B Service Manual - Page 24

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ViewSonic April 1999 - Version 1.0 THEORY OF CIRCUIT OPERATION Service Manual VG150 Input Mode Detection Data Symbol Calibration mode ResO threshold Res1 threshold Res2 threshold Res3 threshold Res4 threshold Res5 threshold Res6 threshold Mode 640x350 Sync Polarity Mode 640x400 Sync Polarity Mode 720x400 Sync Polarity Mode 640x480 Sync Polarity Width (bits) Address Description 2 123H [1:0] This is to select different operation modes of internal phase calibration. The selection criterion is as follow: 0:when input video signal has overshot, it results in longest calibration time 1:when input video signal has median overshot, it results in long calibration time 2:when input video signal has normal overshot, it results in normal calibration time (recommended) 3:when input video signal has no overshot, it results in shortest calibration time 10 124H-125H Upper bound of the line number for 640x350 mode, and lower bound for 640x400 10 126H Upper bound of the line number for 640x400 mode, and lower bound for 720x400 10 128H-129H Upper bound of the line number for 720x400 mode, and lower bound for 640x480 10 12AH-12BH Upper bound of the line number for 640x480 mode, and lower bound for 800x600 10 12CH-12DH Upper bound of the line number for 800x600 mode, and lower bound for 1024x768 10 12EH-12FH Upper bound of the line number for 1024x768 mode, and lower bound for 1280x1024 10 130H-131H Upper bound of the line number for 1280x1024 mode. If the input has more line than this threshold, it is considered INVALID mode 2 132H[1:0] The polarity of input synchronization signals Bit 0 is for VSYNC and bit 1 is for HSYNC 2 132H[3:2] The polarity of input synchronization signals Bit 0 is for VSYNC and bit 1 is for HSYNC 2 132H[5:4] The polarity of input synchronization signals Bit 0 is for VSYNC and bit 1 is for HSYNC 2 132H[7:6] The polarity of input synchronization signals Bit 0 is for VSYNC and bit 1 is for HSYNC Page 21 Con fideiffiaTrkilroTCbpyl

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ViewSonic
April
1999
-
Version
1.0
Service
Manual
VG150
THEORY
OF
CIRCUIT
OPERATION
Input
Mode
Detection
Data
Symbol
Width
(bits)
Address
Description
Calibration
mode
2
123H
[1:0]
This
is
to
select
different
operation
modes
of
internal
phase
calibration.
The
selection
criterion
is
as
follow:
0:when
input
video
signal
has
overshot,
it
results
in
longest
calibration
time
1:when
input
video
signal
has
median
overshot,
it
results
in
long
calibration
time
2:when
input
video
signal
has
normal
overshot,
it
results
in
normal
calibration
time
(recommended)
3:when
input
video
signal
has
no
overshot,
it
results
in
shortest
calibration
time
ResO
threshold
10
124H
-125H
Upper
bound
of
the
line
number
for
640x350
mode,
and
lower
bound
for
640x400
Res1
threshold
10
126H
Upper
bound
of
the
line
number
for
640x400
mode,
and
lower
bound
for
720x400
Res2
threshold
10
128H
-129H
Upper
bound
of
the
line
number
for
720x400
mode,
and
lower
bound
for
640x480
Res3
threshold
10
12AH-12BH
Upper
bound
of
the
line
number
for
640x480
mode,
and
lower
bound
for
800x600
Res4
threshold
10
12CH-12DH
Upper
bound
of
the
line
number
for
800x600
mode,
and
lower
bound
for
1024x768
Res5
threshold
10
12EH-12FH
Upper
bound
of
the
line
number
for
1024x768
mode,
and
lower
bound
for
1280x1024
Res6
threshold
10
130H
-131H
Upper
bound
of
the
line
number
for
1280x1024
mode.
If
the
input
has
more
line
than
this
threshold,
it
is
considered
INVALID
mode
Mode
640x350
Sync
Polarity
2
132H[1:0]
The
polarity
of
input
synchronization
signals
Bit
0
is
for
VSYNC
and
bit
1
is
for
HSYNC
Mode
640x400
Sync
Polarity
2
132H[3:2]
The
polarity
of
input
synchronization
signals
Bit
0
is
for
VSYNC
and
bit
1
is
for
HSYNC
Mode
720x400
Sync
Polarity
2
132H[5:4]
The
polarity
of
input
synchronization
signals
Bit
0
is
for
VSYNC
and
bit
1
is
for
HSYNC
Mode
640x480
Sync
Polarity
2
132H[7:6]
The
polarity
of
input
synchronization
signals
Bit
0
is
for
VSYNC
and
bit
1
is
for
HSYNC
Page
21
Con
fideiffiaTrkilroTCbpyl