Any problems leaving JTAG_MOD float?

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Any problems leaving JTAG_MOD float?

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carymednick
Contributor I

It is desired for the production version of a board to allow for boundary scan JTAG operation by default. If needed for software debugging the JTAG_MOD pin will be tied low. This requires leaving the JTAG_MOD pin floating or tying it high. The hardware manual states for normal operation tie the JTAG_MOD pin low. However, it doesn't define what is normal operation. If the JTAG_MOD pin is left floating, will the chip boot and run correctly?

This is a MCIMX6D6AVT10A. However, I think the question is fairly model agnostic.

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igorpadykov
NXP Employee
NXP Employee

Hi Cary

according to Table 2-5. JTAG recommendations i.MX6 User Guide IMX6DQ6SDLHDG

JTAG_MOD should be externally connected to GND for

normal operation in a system.

I believe it affects only TAP configuration, no chip behavior on boot or running codes.

Best regards

igor

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carymednick
Contributor I

Hi Igor,

Thank you for your response. If it only affects TAP configuration than it should not be an issue.

Regards,

Cary

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