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Hello i am trying to interface a board with J-ling EDU Segger debugger shown in the attached photo. The board has 8pin connection but the jlink device has 20 pin connection. I have tried to look in the manual bellow to find out what each output pin one that device represents https://www.segger.com/downloads/jlink/UM08001 i have attached a photo of the schematics of the board connection. how do i connect between the board and the JLINK EDU device? Thanks.

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Frant
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rocko445
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  • On https://www.segger.com/products/debug-probes/j-link/technology/interface-description/ there is a description of the pinout of the j-link. – steviethecat Jun 23 '20 at 07:43
  • Hello Steve on my board i have the 8pin connection where each pin is described as followes: VSS GND RST TX DIO CLK SWO RX but on the jlink device in the link you advised i have Vtref nTRST TDI TMS TCK RTCK TDO RESET DBGRQ 5V-suplly NC GND Where should i connect DIO SWO RX TX CLK to the JLINK device they dont have the same name? Thanks – rocko445 Jun 23 '20 at 08:58
  • If you scroll a bit further down on the link (to https://www.segger.com/products/debug-probes/j-link/technology/interface-description/#swd-and-swo-also-called-swv-compatibility) it shows the _SWD and SWO (also called SWV) Compatibility_ pinout. Not sure about the TX and RX connections though. I've never used those for jtag connections. – steviethecat Jun 23 '20 at 09:58
  • Hello Steve, on my Jlink device what is the pin order, i cant see on the actual device . there is the bulge but its not helping much Thanks – rocko445 Jun 23 '20 at 12:38
  • The bulge on the connector should be sufficient to determine the pinout of the segger. I haven't got one around me right now, but you can always measure between pin 19 and 20 (which ought to give 5v) with the segger plugged into USB. Between pin 1 and 2 there should not be 5v. – steviethecat Jun 24 '20 at 07:13

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