JTAG can't communicate with IMX6UL

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JTAG can't communicate with IMX6UL

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bryant_chou
Contributor I

Hi Sir:

  I want to use JTAG to communicate with IMX6UL for debug purpose, but now the JTAG can't communicate with IMX6UL.

  I find the signals, TMS, TDI, TCK, NTRST and POR_B, from JTAG are correct, but we can't receive the TDO output from IMX6UL.

  

    My question is how do i check status about ”JTAG_SMODE[1:0]” and the register 0x460 of Boot Fusemap ??? Are there have any hardware pin can check it???

 

 The description  about JTAG_SMODE at IMX6ULHDG

    HWGUIDE.jpg

  The description  about r 0x460 of Boot Fusemap at IMX6ULRM

   RM.jpg

    

    Thanks and  Regards,

    Bryant Chou

2 Replies

498 Views
bryant_chou
Contributor I

Hi Yuri:

   The IMX6UL can work and bring up.

   Thank for your replay.

   Thanks and  Regards,

    Bryant Chou

498 Views
Yuri
NXP Employee
NXP Employee

Hello,

  i.MX 6UL devices by default are in JTAG enabled mode. I do not think 

this is root of the issue. Is the i.MX 6UL working? Please verify the scheme,

using the design checklist and  chapter "Avoiding board bring-up problems"

in  the Hardware Development Guide.

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf

  The following may be helpful.

i.MX6UL Hardware design checklist 


Have a great day,
Yuri

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