SPRACS4 June   2020 TMS320F2800132 , TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800152-Q1 , TMS320F2800153-Q1 , TMS320F2800154-Q1 , TMS320F2800155 , TMS320F2800155-Q1 , TMS320F2800156-Q1 , TMS320F2800157 , TMS320F2800157-Q1 , TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S , TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DK-Q1

 

  1.   Enhancing Device Security by Using JTAGLOCK Feature
    1.     Trademarks
    2. 1 Security Feature on C2000 Device
    3. 2 JTAGLOCK Feature
      1. 2.1 Z1OTP_JLM_ENABLE
      2. 2.2 JTAG Password
        1. 2.2.1 Z1OTP_JTAGPSWDHx
        2. 2.2.2 Z1OTP_JTAGPSWDLx
    4. 3 Enabling JTAGLOCK
      1. 3.1 CCS Flash Plug-in GUI
      2. 3.2 Security Configuration Embedded in .out File
    5. 4 Disabling JTAGLOCK
      1. 4.1 Target Configuration (.ccxml) File
    6. 5 Permanent JTAGLOCK
    7. 6 References

4 Disabling JTAGLOCK

Occasionally, a need may arise to debug the device in which JTAGLOCK is enabled (JTAG interface disabled). For example, a device may be returned to Texas Instruments for failure analysis (FA). Code Composer Studio (CCS) is the most convenient tool to debug the C2000 device and for that, the JTAG interface need to be accessible. For this reason, a hardware mechanism has been provided to disable the JTAGLOCK by providing 128-bit JTAG password. This hardware mechanism uses the JTAG pin to enter the password, therefore, access to JTAG pins on the circuit board must be available for this.

Section 4.1 explains how to disable the JTAGLOCK using 128-bit JTAG password.