J-LinkOBisanon-boarddebugprobeaspartofYOURevalboard.ThemicrocontrollerhasaUSB-interfaceononesideandaJTAG/SWD+SWOetc.interfaceonthedeviceside.Itallowsdebuggingthetargetdeviceontheboarditcomeswith,withouttheneedforanadditionaldebugprobe.J-LinkOBisusedonvariousevalboardsbysev