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Method for realizing closing internal function of integrated circuit

A technology of integrated circuits and implementation methods, applied in the fields of electrical digital data processing, static memory, read-only memory, etc., can solve the problems of PAD package damage, insufficient security, and inability to apply permanent closure of integrated circuits, and achieve enhanced security. Effect

Active Publication Date: 2007-03-28
BEIJING SINOSUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the Probe Pad is not packaged, the programming function of the EEPROM cannot be reopened
[0006] However, this solution requires an additional PAD to support the realization of this function; and the security of this solution is only based on the premise that the PAD is not encapsulated. In the case of sufficient technical guarantee, the PAD package may be destroyed, so it is safe Insufficient in performance; this solution also has no general application significance, and is only applicable to occasions where the operation of non-volatile memory is prohibited, and cannot be applied to all occasions where the internal functions of integrated circuits need to be permanently closed

Method used

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  • Method for realizing closing internal function of integrated circuit
  • Method for realizing closing internal function of integrated circuit
  • Method for realizing closing internal function of integrated circuit

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specific Embodiment

[0049] A1. When the chip is powered on and reset, it is detected that the data in the predetermined unit address Addr_mode of the non-volatile memory is the first characteristic value Data_A of the first mode Mode_A, and Mode_A_enable is set to be valid. After the chip is powered on and reset (in Mode_A working mode) , writing the second characteristic value Data_B of the second data mode Mode_B into the predetermined unit address Addr_mode of the non-volatile memory.

[0050] B1. When the chip is powered on and reset again, it is detected that the data in the address Addr_x of the non-volatile memory is the second characteristic value Data_B, and the chip works in the Mode_B mode.

[0051] It should be noted that the above-mentioned Mode_A and Mode_B refer to the fact that in order to adapt to different requirements, the chip makes a choice between different functions during power-on reset, closing or opening, so as to adapt to the working requirements of different environment...

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Abstract

The method includes following steps: (1) under working mode of IC chip, writing in a predefined characteristic value to prearranged unit in non-volatile memory; (2) resetting relevant functional circuits inside IC in stages; in resetting procedure in stages, the method validates whether there are predefined characteristic values in the non-volatile memory one by one forcibly in order to open / close corresponding function / mode. In power on and reset, the invention closes different function in selectivity so as to enhance security of chip, as well as realize permanent settings for IC based on different condition.

Description

technical field [0001] The invention relates to a method for shutting down internal functions of an integrated circuit containing a nonvolatile memory, in particular to a method for realizing permanent failure of a specific function inside the integrated circuit. Background technique [0002] As the functions of integrated circuits become more and more complex, some functions are only used in specific occasions, and need to be prohibited in other occasions, for example: after the integrated circuit has been fully tested, in order to prevent illegal users from stealing Or to modify confidential data, it is necessary to close the originally available test mode or certain test functions; as another example: sometimes based on a certain sales strategy, the same version of the chip needs to open different functions for different users, thus becoming a different chip. Therefore, It is necessary to selectively and permanently shut down different functions inside the integrated circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C16/22G06F21/00
CPCG11C16/22
Inventor 仇建
Owner BEIJING SINOSUN TECH