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Mahmood Elnasser
06/06/13 08:54
Read: 1291 times
Sacramento
USA


 
#189878 - Serial Wire Debug SWD
Responding to: Erik Malund's previous message
The Serial Wire (SW) mode is a different operating mode for the JTAG port where only two pins, TCLK and TMS, are used for the communication. A third pin can be use optionally to trace data. JTAG pins and SW pins are shared.

TCLK is SWCLK (Serial Wire Clock)
TMS is SWDIO (Serial Wire debug Data Input/Output)
TDO is SWO (Serial Wire trace Output)

Quote from keil ULINK2 user's guide.
I think that reset pin of ARM should be also used because program on chip might stop the JTAG from communicating with the debugger and this might be the case with my LPC810 demo board.
Mahmood

List of 10 messages in thread
TopicAuthorDate
LPC810 demo board      Mahmood Elnasser      05/11/13 15:18      
   quick start video tutorial      Mahmood Elnasser      05/24/13 14:26      
   ULINK2 and J-link      Mahmood Elnasser      06/05/13 14:29      
      What's wrong with SWD?      Oliver Sedlacek      06/06/13 04:45      
         what is SWD?      Erik Malund      06/06/13 07:04      
            Serial Wire Debug SWD      Mahmood Elnasser      06/06/13 08:54      
               SWD capabilities      Oliver Sedlacek      06/06/13 10:13      
      Problem solved      Mahmood Elnasser      06/06/13 14:14      
         So how did you fix it?      Andy Neil      06/10/13 15:50      
            modified the board        Mahmood Elnasser      06/11/13 02:33      

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