TMS570LS1227 Datasheet, PDF (116/184 Pages) Texas Instruments – TMS570LS1227 16- and 32-Bit RISC Flash Microcontroller

TMS570LS1227
SPNS192B – OCTOBER 2012 – REVISED FEBRUARY 2015
www.ti.com
6.21.6 Advanced JTAG Security Module
This device includes a an Advanced JTAG Security Module (AJSM). which provides maximum security to
the device’s memory content by allowing users to secure the device after programming.
Flash Module Output
OTP Contents
(example)
Unlock By Scan
Register
HL HL
... _{H L L H}
...
Internal Tie-Offs
(example only)
L L HH
HHL L
128-bit comparator
UNLOCK
Internal Tie-Offs
(example only)
H LLH
HL LH
Figure 6-22. AJSM Unlock
The device is unsecure by default by virtue of a 128-bit visible unlock code programmed in the OTP
address 0xF0000000.The OTP contents are XOR-ed with the "Unlock By Scan" register contents. The
outputs of these XOR gates are again combined with a set of secret internal tie-offs. The output of this
combinational logic is compared against a secret hard-wired 128-bit value. A match results in the
UNLOCK signal being asserted, so that the device is now unsecure.
A user can secure the device by changing at least one bit in the visible unlock code from 1 to 0. Changing
a 0 to 1 is not possible since the visible unlock code is stored in the One Time Programmable (OTP) flash
region. Also, changing all the 128 bits to zeros is not a valid condition and will permanently secure the
device.
Once secured, a user can unsecure the device by scanning an appropriate value into the "Unlock By
Scan" register of the AJSM module. This register is accessible by configuring an IR value of 0b1011 on
the AJSM TAP. The value to be scanned is such that the XOR of the OTP contents and the Unlock-By-
Scan register contents results in the original visible unlock code.
The Unlock-By-Scan register is reset only upon asserting power-on reset (nPORRST).
A secure device only permits JTAG accesses to the AJSM scan chain through the Secondary Tap # 2 of
the ICEPick module. All other secondary taps, test taps and the boundary scan interface are not
accessible in this state.
116 System Information and Electrical Specifications
Copyright © 2012–2015, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: TMS570LS1227