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ARM Cortex-M3 Jtag question

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muzzamil8

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Hi,

I am using LM3S6965 microcontroller which uses JTAG standard for programming. It is an ARM core and uses standard 20-pin connector for programming the controller. My question is, can I use 20-pin to 6-pin cable with 20-pin connector on external debugger (JLINK) and 6-pin connector on target board? 6 pins on target board will include signals TDI,TDO,TMS,TCK,GND,VCC. Is it correct design?

Secondly, What is the purpose of 9 ground pins (4,6,8,10,12,14,16,18,20 pins) on standard 20-pin JTAG connector?
 

cionst

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Yes, you can use 6PINS. But normally I use TDI,TDO,TMS,TCK,TRST,RTCK,GND,VCC.
 

FvM

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Some debug/trace adapters are relying on the RTCK signal to achieve higher speed. You should check with your tools.
 

muzzamil8

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What is the purpose of RTCK signal?
 

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