OLIMEX© 2015
A20-SOM user's manual
6.5.5 GPIO-5 (General Purpose Input/Output) 40pin connector
GPIO-5 connector
Pin # Signal name
Processor pin#
Pin # Signal name
Processor pin#
1
PG0
F20
2
GND
-POWER CIRCUIT-
3
PG1
F21
4
SDC3-D0
A17
5
PG2
E20
6
SDC3-D1
B17
7
PG3
D21
8
SDC3-D2
A16
9
PG4
D20
10
SDC3-D3
B16
11
PG5
C21
12
SDC3-CMD
A18
13
PG6
E19
14
SDC3-CLK
B18
15
PG7
C20
16
PC16/CAM-PWR-EN
M21
17
PG8
D19
18
PC17/NWP
F23
19
PG9
C19
20
PC18
F22
21
PG10
D18
22
PC23
G19
23
PG11
C18
24
PC24/NQS
F21
25
NDQ0
H23
26
PC7/NRB1
J22
27
NDQ1
H22
28
NRB0
J23
29
NDQ2
G23
30
NRE
K22
31
NDQ3
G22
32
PC3/SATA-PWR-EN
L22
33
NDQ4
H21
34
NCLE
L23
35
NDQ5
H20
36
NALE
M22
37
NDQ6
G21
38
NWE
M23
39
NDQ7
G20
40
NCE0
K23
6.5.6 GPIO-6 (General Purpose Input/Output) 10pin connector
This connector was added in hardware board revision C. It is missing in board revisions A and B.
It has some points that might be used as test pads. Also couple of signals that might be used to
debug the power supply.
GPIO-6 connector
Pin # Signal name
Processor pin#
Pin # Signal name
Processor pin#
1
FMINL
Y20
2
TVIN2
AA17
3
FMINR
Y21
4
TVIN3
Y17
5
VMIC_OUT
USED FOR MIC
6
AXP_BACKUP
GOES TO AXP209
7
IPSOUT
COMES FROM AXP209
8
AXP_RST
GOES TO AXP209
9
UBOOT_SEL
W8
10
AXP_PWRON
GOES TO AXP209
11
VDD_RTC
COMES FROM AXP209
12
GND
-POWER CIRCUIT-
13
TP1
FREE
14
TP2
FREE
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