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Help needed to understand stm32F3 discovery board  schematics

Question asked by Channamallesh Hiremath on May 11, 2018
Latest reply on May 11, 2018 by Clive One

On the stm32F3 discovery boards, where do pins on CN3 get connected when CN4 jumpers are on and off. 


Schematics says, CN4 jumpers on, will select discovery. Off means ST-LINK is selected. 


If I take CN4 off, then CN3 pin2 is not connected to PA14 of st32f303 device. 


I have to have CN4 on for PA14 to get connected to pin2 of CN3.


Please help me.