Secure JTAG for i.MX RT1170
●This document describes how the Secure JTAG on the i.MX RT1170 MCU family can be used.
●The i.MX RT series JTAG Controller (JTAGC) provides a possibility to regulate the JTAG access. The three JTAG security modes are available in the i.MX RT series:
■No Debug mode—Maximum security is provided in this mode. All security-sensitive JTAG features are permanently blocked, preventing any debug.
■Secure JTAG mode—High security is provided in this mode. Secret key-based challenge/response authentication mechanism is used for JTAG access
■JTAG Enabled mode—Low security is provided in this mode. It is the default mode of operation for the JTAGC.
●Moreover, you can also fully disable the JTAGC functionality. For configuration of these JTAG modes, One Time Programmable (OTP) eFuses are used and burned after packaging. The fuse burning process is irreversible. It is impossible to revert the fuse back to the unburned state. To explain, Secure JTAG mode is used in this document. The aim is to allow return/field testing. Authorized reactivation of the JTAG port is allowed in this mode.
●There are several hardware modifications that must be made to fully enable the JTAG on an RT1170-EVK. The resistors R37, R41, R42, R43, and R44 must to be soldered on. The resistors R78, R187, R195, and R208 must be removed. See the hardware design manual and the EVKB schematic for more details.
●Before the Secure JTAG can be enabled, enable also the HAB and set it to the HAB Closed mode. You can find the step-by-step guide for enabling HAB in the i.MX RT1170 security application note.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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02/2021 |
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Rev. 0 |
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AN13133 |
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288 KB |
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