SOM-9X20 User Manual
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A.3. SOMDB2 Onboard I/O
A.3.1. USB 2.0 Port
The SOMDB2 carrier board has two onboard USB 2.0 ports which feature a USB Type A receptacle connector
and they are labeled as "USB2_R" and "USB2_L". The pinouts of the USB 2.0 ports are shown below.
Table 1: USB 2.0 ports pinouts
A.3.2. JTAG Connector
The SOMDB2 carrier board comes with a set of JTAG signals that allow JTAG debugging equipment to be used.
The connector is labeled as “J2”. The pinouts of the JTAG connector are shown below.
Table 2: JTAG connector pinouts
USB2_R
Pin
Signal
1
USB2_R
2
HUB_USBDN_DM4_C
3
HUB_USBDN_DP4_C
4
GND
Figure 14: USB 2.0 ports diagram
BR203
2
+
USB2_R
1
1
1
USB2_L
1
Pin
Signal
1
VREG_S4A_1P8
2
N/A
3
JTAG_TRST_N
4
GND
5
JTAG_TDI
6
GND
7
JTAG_TMS
8
JTAG_TCK
9
JTAG_TDO
10 JTAG_SRTS_N
11 JTAG_PD_1
12 JTAG_PD_2
13 NC
14 JTAG_CONN_DET_N
BR203
2
+
1
J2
1
Figure 15: JTAG connector diagram
USB2_L
Pin
Signal
1
USB2_L
2
HUB_USBDN_DM3_C
3
HUB_USBDN_DP3_C
4
GND
