Appendix B:
Jumper Settings
JB1
Boot0 Source Selection
Jumper
Position
Setting
Pins 2 & 3
A
Serial Boot Loader Download (EBI)
Pins 1 & 2* B
Normal Boot from Flash (DBI)
* Default setting
JB2
Boot1 Option Selection
Jumper
Position
Setting
Pins 2 & 3* A
Flash Enable (FE)
Pins 1 & 2
B
Flash Disable (FD)
* Default Setting
JB3
Flash Write Protect (Software Pollable via GPIO_62)
Jumper
Position
Setting
Pins 2 & 3
A
Logic 0
Pins 1 & 2* B
Logic 1
* Default setting
Note: the SoM used in the PPC does not have any hardware lock for the accessing the
flash however a software scheme can be utilized by reading GPIO_62.
JB4
RTC Battery Enable
Jumper
Position
Setting
Pins 1 & 2
ON
Enable Battery Backup
Pins 2 & 3* OFF
Disable Battery Backup
* Default setting
JB5
RS485/RS422 Select
Jumper
Position
Setting
Pins 1 & 2
485
Select RS485
Pins 2 & 3* 422
Select RS422
* Default setting
JB6
RS232/RS4xx Select
Jumper
Position
Setting
Pins 1 & 2* 232
Select RS232
Pins 2 & 3
4xx
Select either RS422 or RS485 depending on JB5
* Default setting
