Safety JTAG module and method for protecting safety of information inside chip
A safe and secure configuration technology, applied in computer security devices, internal/peripheral computer component protection, instruments, etc., can solve the problem of not being able to access the content that user B can access, inconvenient for personalized distribution and multi-party development, and JTAG port protection measures failure and other problems, to achieve personalized management, avoid the risk of failure, and ensure the effect of safety
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[0045] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0046] figure 1 It is a schematic diagram of the internal structure of the system chip disclosed in the present invention. A system on chip (System on Chip, SOC) 2 includes: a security JTAG (Join Test Action Group) module 21 , a processor JTAG circuit 22 , a full scan chain test circuit 23 and a memory test circuit 24 . Processor JTAG circuit 22, full scan chain test circuit 23 and memory test circuit 24 are the object (abbreviation protection object) that system chip 2 is protected by safety JTAG module 21, only through the safety permission of safety JTAG module 21, the user just can pass through JTAG port 1 accessing or starting the protection object, and realizing the test or debugging of the system chip 2 . Therefore, the present invention focuses on describing how the security JTAG module 21 implements security control on the processor JTAG circ...
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