JTAG J17 terminal connection.

[takashitakahash]

Hi community.

IMX6 SABRE AI CPU Card, at the Revision B, when  look at the circuit around JTAG CONNECTR of J17, JTAG_nTRST has not been connected to the J17.

(TRSTB terminal of iMX6 has H level is always input)

TRSTB terminal is the H level fixed, there is no problem?

[sinanakman]

Hi Takahashi

In addition to Yuri's explanations please also

note that JTAG_nTRST is an optional pin

for JTAG debugging and most JTAG debuggers

can work without this pin (and reset the TAP

with a different sequence).

Hope this helps

Regards

Sinan Akman

[Yuri · Accepted solution]

   According to Table 2-19 (JTAG interface summary) of “Hardware Development
Guide for i.MX 6 …” :
JTAG_TRSTB input of i.MX6 has internal 47 kOhm pull up and

external pull up is not required; nevertheless it is possible to

apply external 10 kOhm pull up.

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

Have a great day,
Yuri

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