embeded/ARM2015. 12. 14. 10:30

음.. JTAG없이 SWD만으로 하는데

SWD로 안되면.. 머가 문제일려나..

TCK/TMS 인식인가..?


How do I switch the debugger connection between JTAG and SWD (Serial Wire Debug) protocol?

Applies to: Debug Access Port (DAP)

Answer

The SWJ-DP component supports both protocols - Serial Wire and JTAG. The selector is part of the SWJ-DP.

The default protocol at power-up is JTAG, so if you want to use Serial Wire, you need to use the TCK and TMS pins to scan in a special 'key', which is a sequence of TMS values which has no effect for a pure JTAG TAP but is recognized by a SWJ-DP TAP as a request to switch into Serial Wire mode. Similarly, there is another another TMS sequence to switch back from SWD to JTAG protocol.


[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka11775.html]

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