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6-9
A
Main Board Circuit Diagram: MT8550 FLASH/USB/ETH/GPIO
1
3.3V_STBY
R509
0
VCC3IO_STB
J20
J21
F22
3.3V_STBY
R520
0
AVDD33_LDO
L20
L19
2
AVDD10_LDO
K19
C500
NC
VCC3IO_STB
VCC3IO_STB
Close to
C501
IC
4.7uF/10V
RS232
3.3V_STBY
33STB
R521
R523
10K
10K
1
1
UARXD
2
2
3
UATXD
3
3
4
4
J506
GND3
4PIN/2.0mm
4
A
B
U100D
J24
GPIO8
R522
GPIO8
GPIO8
LCD RD
K20
DVCC33_IO_STB
ETCOL
TP513
F23
ETTXEN
TP515
DVCC33_IO_STB
ETCRS
J25
ETMDC
TP514
MOPEN
NFW EN
K25
ETMDIO
TP512
G24
NFR EN
TP510
ETRXCLK
F25
ETRXD0
TP511
G20
NFC EN
DGND
ETRXD1
TP509
NFCEN2
H21
TP508
ETRXD2
G25
ETRXD3
TP507
F24
SFCS
ETRXDV
TP506
E25
TP504
ETRXER
AMUTE
G23
ETTXCLK
TP505
G22
NFCLE
AVDD33_LDO
ETTXD0
TP503
G21
TP502
ETTXD1
NFALE
H20
ETTXD2
TP501
H23
ETTXD3
TP500
ETTXEN
H22
ETTXEN
POWER#
E24
ETTXER
AVSS33_LDO
UARXD
J22
UARXD
J23
UATXD
UATXD
VSTB
L21
AVDD10_LDO
VSTB
L22
VDATA
VDATA
VCLK
L23
VCLK
LCD RD
K22
LCDRD
Close to MT8550
I R
K21
IR
K23
R923
1K/1%
RESET#
RESET_
OPWRSB
K24
OPWRSB
C931
0.1uF/25V
MT8550-DDR3-BGA492-090924
MT8550/BGA492/P0.8/B0.4/21X21
IR
Reset
ESD
Close to
AVDD33_LDO
IC
IR
C502
C503
C504
0.01uF/25V
4.7uF/10V
0.01uF/25V
1
1
2
2
3
3
4
4
5
5
R952
6
6
7
7
8
8
9
9
5VB
OP
J501
POW
UARXD
10PIN/2.0mm
UATXD
OPEN
3.3V_STBY
POWER#
3.3V_STBY
MOPEN
B
C
HW Trapping Pin
CNT
3.3V
10K
Default value as below:
(else system will enter test mode)
FAST_EJECT
---------------------------------------------------------------------
* ETTXEN: 1
HW TRAPPING
LCDRD: 0
NFWEN: 0
NFREN: 0
NFCEN/NFCEN2: 00
---------------------------------------------------------------------
---------------------------------------------------------------------
| SFCS: reserve
| AMUTE: [ L(Default) H(Main ICE)]
| NFCLE: [ H(Default, Nand)]
---------------------------------------------------------------------
| NFALE: [ L(ROM/NAND boot) H(NOR boot)]
---------------------------------------------------------------------
5V_STBY
GND4
VSTB
VCLK
VDATA
R929
100
I R
R8
100
VSTB
R931
100
VCLK
R933
100
VDATA
0
R954
0R/NC
12V_P
R935
100
OPWRSB
PWR_CTRL#
R936
100
POWER
R937
100
OPEN
R953
0R/NC
FAST_EJECT
R955
0R/NC
5V_STBY
C6
C510
C508
100pF/50V/NP0
100pF/50V/NP0
100pF/50V/NP0
need MTK cofirm again
R401
4.7K
R403
2.2K
POWER
R397
4.7K
R408
2.2K
OPEN
C
6-9
D
RESET#
RESET#
(2)
FAST_EJECT
(10)
NFW EN
NFW EN
(6)
NFR EN
NFREN
(6)
NFC EN
NFCEN
(6)
NFCEN2
NFCEN2
(6)
AMUTE
AMUTE
(5)
NFCLE
NFCLE
(6)
NFALE
NFALE
(6)
SFCS
SFCS
(6)
OPWRSB
OPWRSB
D
E
1
2
3
4
E
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