Advantech ROM-3420CD-MDA1E User Manual page 16

SW1001 (Boot selection)
Jumper Mode
1-ON
SPI-ROM (Default)
2-OFF
CN1101 (MCU programming port)
Pin Signal
1 +3.3 V
3 MCU_RXD
5 GND
CN1201 (JTAG connector)
Pin Signal
1 +3.3 V
3 JTAG_TMS
5 JTAG_TDI
7 -
9 -
CN1202 (Debug connector)
Pin Signal
1 +3.3 V
3 UART1_RX
Jumper Mode
1-OFF
SD (Reserved for recovery)
2-ON
Pin Signal
2 MCU_TXD
4 MCU_PROGRAM#
Pin Signal
2 JTAG_TRST#
4 JTAG_TDO
6 JTAG_TCK
8 GND
10 GND
Pin Signal
2 UART1_TX
4 GND
7 ROM-3420 User Manual