Secure JTAG for i.MXRT10xx Application Note
■This document describes how the Secure JTAG on the i.MX RT10xx MCU family can be used.
■The i.MX RT series System JTAG Controller (SJC) 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 SJC.
■Moreover, you can also fully disable the SJC 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. On the HW side, JTAG signals must be routed out and accessible in the application.
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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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November 2019 |
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Rev. 1 |
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AN12419 |
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450 KB |
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