MCIMX6Q-SDB/nSRST of JTAG

[soichiyamamoto]

Hi,

There is a question about JTAG circuit of MCIMX6Q-SDB.

Follows are nSRST specifications.

　　nSRST（Input/output）

　　　　　Active Low output from RealView ICE to the target system reset, with a 4.7kΩ pull-up resistor for de-asserted state.

　　　　　This is also an input to RealView ICE so that a reset initiated on the target can be reported to the debugger.

　　　　　This pin must be pulled HIGH on the target to avoid　unintentional resets when there is no connection.

However, in MCIMX6Q-SDB, it does not support the following specifications.

　　　　・This is also an input to RealView ICE so that a reset initiated on the target can be reported to the debugger.

Q1)What is the reason?

Best Regards,

soichi

[igorpadykov]

Hi Soichi

reason is that there is no reset button on board. Also according to arm faq

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka3895.html

"It is not strictly necessary to connect nSRST..".

If necessary one can add this using Figure 2-3 Example reset circuit logic

arm document DAI0072A_multiicedesign_notes.pdf

Best regards

igor

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