Supercharge Your Innovation With Domain-Expert AI Agents!

DSP programming anti-password locking circuit based on logic chip

A logic chip and circuit technology, which is applied in the field of DSP programming anti-password lockout circuit, can solve the problems of security module password lockout, etc., and achieve the effect of strong versatility, simple logic and high reliability

Pending Publication Date: 2019-11-19
TIANJIN JINHANG COMP TECH RES INST
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In engineering applications of DSP2812, the CPU external reset circuit is often designed to enhance the reliability and safety of the product. However, when the Flash is programming the program code, if the DSP reset pin (Pin 160) Receiving a low-level reset input signal will cause the CSM code security module password to be locked, and the password is set randomly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • DSP programming anti-password locking circuit based on logic chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 1 As shown, a DSP programming anti-password lockout circuit applied to the peripheral circuit of the lubricating oil temperature controller CPU provided by the embodiment of the present invention is a program-programming anti-password lockout circuit applied to a DSP2812 as a CPU. It includes jumper circuit and logic processing circuit. External jumper switching (external ground / high level (logic 0 / 1) input switching) is realized through a three-position pin, the middle pin is connected to the logic processing circuit, and the pins on both sides are respectively connected to high / low level, Realize switching of the high / low effective bit of the middle pin through a jumper; then connect the reset ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a DSP programming anti-password locking circuit based on a logic chip, and relates to the field of aviation electrical technology. According to the invention, three pins are adopted, the logic value of a third pin is changed through an external jumper wire, a CPU external reset signal input to a DSP reset pin is controlled by a logic chip to be effective or shielded, and when a circuit is in a debugging stage or program code programming is carried out, the reset signal is shielded; and after programming of the program code is completed, the jumper terminal is changed,and the external reset signal is enabled to be valid again. According to the circuit, effective / shielded quick switching of CPU reset signals is achieved in a three-position pin jumper mode, and afterproduct software upgrading is completed, product state solidification can be achieved in a soldering tin short circuit mode.

Description

technical field [0001] The invention relates to the field of aviation electrical technology, in particular to a logic chip-based DSP programming anti-password locking circuit. Background technique [0002] At present, DSP2812 is widely used as the CPU of airborne controller equipment, and DSP2812 is designed with a CSM code security module to protect program code security. The module is composed of 8 16-bit units, and the modules protected by CSM include Flash, OTP, L0 and L1. Programmers can set the CSM module password in the Code Security Password area of ​​the menu bar on the Flash programming tool interface. In engineering applications of DSP2812, the CPU external reset circuit is often designed to enhance the reliability and safety of the product. However, when the Flash is programming the program code, if the DSP reset pin (Pin 160) Receiving a low-level reset input signal will cause the password of the CSM code security module to be locked, and the password is set r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F8/61G06F8/65G06F11/07G06F21/72
CPCG06F8/63G06F8/65G06F11/0757G06F21/72
Inventor 王清泉仝步升刘强
Owner TIANJIN JINHANG COMP TECH RES INST
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com