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SPRZ439H January 2017 – February 2024 TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

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TMS320F28004x Real-Time MCUs Silicon Errata (Silicon Revisions B, A, 0)
1Usage Notes and Advisories Matrices
1. 1.1 Usage Notes Matrix
2. 1.2 Advisories Matrix
2Nomenclature, Package Symbolization, and Revision Identification
3Silicon Revision B Usage Notes and Advisories
1. 3.1 Silicon Revision B Usage Notes
2. 3.2 Silicon Revision B Advisories
  1. Advisory
  2. Advisory
  3. Advisory
  4. Advisory
  5. Advisory
  6. Advisory
  7. Advisory
  8. Advisory
  9. Advisory
  10. Advisory
  11. Advisory
  12. Advisory
  13. Advisory
  14. Advisory
  15. Advisory
  16. Advisory
  17. 3.2.1 Advisory
  18. Advisory
  19. Advisory
  20. Advisory
  21. Advisory
  22. 3.2.2 Advisory
  23. Advisory
  24. Advisory
  25. Advisory
  26. Advisory
  27. Advisory
  28. 3.2.3 Advisory
  29. Advisory
  30. Advisory
  31. 3.2.4 Advisory
4Silicon Revision A Usage Notes and Advisories
1. 4.1 Silicon Revision A Usage Notes
2. 4.2 Silicon Revision A Advisories
  1. Advisory
  2. Advisory
  3. Advisory
  4. Advisory
  5. Advisory
  6. Advisory
5Silicon Revision 0 Usage Notes and Advisories
1. 5.1 Silicon Revision 0 Usage Notes
2. 5.2 Silicon Revision 0 Advisories
  1. Advisory
  2. Advisory
  3. Advisory
6Documentation Support
7Trademarks
8Revision History

3.1.4 Security: The primary layer of defense is securing the boundary of the chip, which begins with enabling JTAGLOCK and Zero-pin Boot to Flash feature

Revisions Affected: 0, A, B

Device security relies on the premise that unauthorized code is not allowed to enter the device and execute under any circumstances. To that end, the device provides two features that a user concerned about security should always enable.

JTAGLOCK
When enabled in the USER OTP area of flash, the JTAGLOCK feature disables JTAG access (for example, debugger connection) to resources on the device, blocking an unauthorized party from using the JTAG interface to download any code into the device. When JTAGLOCK is enabled, the user can still allow an authorized party to unlock it by entering a password, or they can lock it permanently by programming a password value of all all-zeros.
Zero-pin Boot to Flash
The external bootloaders built into the TI ROM do not perform any authentication of the downloaded code. Enabling the Zero-pin boot option along with a flash boot mode in the USER OTP blocks all pin-based external bootloader options (for example, SCI, CAN, Parallel) from running at boot by forcing the boot process to jump immediately to internal flash after the base boot ROM execution concludes. For highest security, the Secure Flash boot mode can be chosen. This enables a pre-check of the flash code by the base boot ROM before jumping to it.

If JTAG is locked permanently and the Zero-pin Boot to Flash option is enabled, programming tools that communicate with the device through JTAG or the built-in bootloaders will not work. If the ability to perform firmware upgrades is desired, the user must pre-store code in flash to securely manage and perform the update.