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ViewSonic Corporation
Confidential - Do Not Copy
VG921m-4
25
GREEN+
AI
34
Analog input from GREEN channel
GREEN-
AI
35
Analog input ground from GREEN
channel
ADCB_VDD AP
36
Analog
power
(3.3V)
RED+
AI
37
Analog input from RED channel
RED-
AI
38
Analog input ground from RED
channel
ADC_GND AG
39
Analog
ground
ADC_GND AG
40
Analog
ground
ADC_VDD AP
41
Analog
power
(3.3V)
AHS
AI
42
Analog HS input
(10), (4), (5)
AVS
AI
43
Analog VS input
(2), (4), (5)
PLL: 8 pins
Name
I/O
Pin No Description
Note
XO
AI
1
Reference clock output
XI
AO
2
Reference clock input
DPLL_GND
AG
3
Ground for digital PLL
DPLL_VDD
AP
4
Power for digital PLL
(3.3V)
APLL_VDD
AP
5
Power for multi-phase PLL
(3.3V)
PLL_TEST1
AIO
6
Test Pin 1 / IRQ#
PLL_TEST2
AIO
7
Test Pin 2/Power-on-latch for crystal
out Frequency
APLL_GND
AG
8
Ground for multi-phase PLL
Control Interface: 7 pins
Name
I/O
Pin No Description
Note
SDIO [0]
IO
54
Serial control I/F data in / Parallel port
data [0]
(2), (3), / 2mA
SDIO [1] / TCON [4] /
BBLU [0]
IO
53
Parallel port data [1] / TCON [4] / TTL
BBLU [0]
(1), (2), (3), / 2mA
SDIO [2] / TCON [3] /
BBLU [1]
IO
52
Parallel port data [2] / TCON [3] / TTL
BBLU [1]
(1), (2), (3), / 2mA
SDIO [3] / PWM2 /
TCON [2]
IO
51
Parallel port data [1] / TCON [4] /
PWM2
(1), (2), (3), / 2mA
SCLK
I
50
Serial control I/F clock
(2), (3), (5)
SCSB
I
111
Serial control I/F chip select
(2), (3), (5)
RESET
O
56
RESET output for Micron
(2), (5), (6) / 2mA
Summary of Contents for VG921m-4 VS11369
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Page 48: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 45 Setp4 3 Check the DDC...
Page 56: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 53 16 Take off the bezel...
Page 78: ...ViewSonic Corporation Confidential Do Not Copy VG921m 4 75 11 PCB Layout Diagrams...
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