Other Parts Discussed in Thread: AM623,
I'm designing the system based on the AM625 / AM623 SoCs.
I noticed that the TRSTn signal (pin B10) is pulled down with a 4.7k resistor.
I understand it was done to properly initialize the JTAG controller integrated into SoC during the system's power-up.
But according to the following document https://www.jtag.com/wp-content/uploads/2019/04/0020-Board-DFT-E-1.pdf
It is recommended to pull up the TRSTn signal
Also, in the IEEE Std 1149.1-2001, section 4.6.2
the pull-up resistor on the TRST pin is recommended
Many JTAG debuggers have the TRST signal pins configured as an open drain and they can't initialize the AM625 JTAG interface
Is there any workaround that will allow me to do the following?
- Properly initialize the JTAG interface during the power-up stage
- Make the TRST pulled up after the power-up stage (JTAG interface will be enabled by default)
Should I expect any issues if the JTAG interface will be enabled by default?
That is the recommendation that I found in the JTAG specification and a few other places
How I can implement it on the AM625 SoC?