TMS320F28035: Debug a locked Tms320f28035

Hi,

In my understanding, If TRST pin is 1 and the device is locked, then it is in emulation boot mode, the user should be able to connect the target, however any access to Flash, OTP, Lx memory will trip the JTAG connection by ECSL.

I understand that,but why i cant connect when I  just use uniflash to unlock my locked device. Do you think unlock device by uniflash will acess secure memory?
I can connect and unlock the chip only when Gpio34 is 0, and GPIO37 is 1 ?

Hi Phan,

If your device is not in wait-boot mode, then probably the device is executing instruction which is accessing protected area (Flash, or Lx memory). In that case any JTAG connection will be tripped by ECSL logic. So the correct way will be to use the Wait boot mode (GPIO34 0, GPIO37 1), and then connect.

In the datasheet, section 8.1.10, the security flow is explained in details. Please go through the flow. If you have further question, please let us know.

Hi Jha,

Can you give me a link to datasheet you mentioned. My document dont have any section 8.1.10.