ARM Cortex-M3 Jtag question

Status
Not open for further replies.
M

muzzamil8

Newbie level 6
Joined
Sep 1, 2011
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,377
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?
 

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

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

What is the purpose of RTCK signal?
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…