F28M36P63C2: JTAG is banned after clear OTPSECLOCK[3:0](JTAGLOCK)

Yale Li 李耀先

Part Number: F28M36P63C2

Hi Team,

Here're some issues from the customer may need your help:

I am looking at the part of CSM. I have the following questions to ask:

1. Whether the code protection mechanism is divided into the following types: password lock, Execute-only protection and JTAG lock

2. Password lock may be unlocked in some cases

3. The JTAG lock is permanent. Once the bits 0-3 of the OTPSECLOCK register (ie JTAGLOCK) are set to 0, the JTAG port cannot be used again.

Thanks & Regards

Yale Li

over 1 year ago

0 Hareesh Janakiraman over 1 year ago

TI__Guru* 94015 points

Yale Li 李耀先 said:
1. Whether the code protection mechanism is divided into the following types: password lock, Execute-only protection and JTAG lock

Not sure I understand the essence of the question. Any such division is notional, since the CSM is a unified module.

Yale Li 李耀先 said:
2. Password lock may be unlocked in some cases

Please clarify the question. Are you saying the device gets unlocked accidentally?

Yale Li 李耀先 said:
3. The JTAG lock is permanent. Once the bits 0-3 of the OTPSECLOCK register (ie JTAGLOCK) are set to 0, the JTAG port cannot be used again.

Yes.

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F28M36P63C2: JTAG is banned after clear OTPSECLOCK[3:0](JTAGLOCK)