Embedded system for correcting programs in read only memory and realization method thereof
An embedded system and embedded technology, applied in the direction of program control device, program loading/starting, etc., can solve the problems of increasing the cost of embedded products, the risks brought by embedded products, and high risks, and achieve the effect of important practical value
Inactive Publication Date: 2012-09-26
HAIER BEIJING IC DESIGN
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Problems solved by technology
However, the traditional ROM storage method has already solidified the program in the ROM during the production process of embedded products, and the program cannot be flexibly modified
Therefore, if only ROM is used for storage, once a problem occurs in the program, it may lead to re-shooting, and the risk is very high
[0007] In summary, only using ROM storage in embedded systems will bring risks to embedded products, and only using OTP storage will increase the cost of embedded products. Therefore, an embedded system with low cost and capable of modifying ROM programs The system and its implementation method have important practical value
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[0016] After the production of the embedded chip is completed, the system program has been completely solidified into the ROM and cannot be modified in any way. At this time, if an error is found in some programs in the ROM, the embedded chip is likely to be scrapped, and then the embedded product will be damaged. production poses great risks. In order to make up for this defect, the present invention burns the correction program of the ROM error program into the OTP in the last link of embedded product production, so as to correct the system function error caused by the ROM error program. The embedded chip is, for example, an MP3 chip, and the embedded product is, for example, an MP3.
[0017] figure 1 It is a block diagram of an embedded system for modifying a ROM program, and the embedded system includes a processor 110 , a ROM 120 , an OTP 130 , a monitoring circuit 140 , and a controller 150 for selecting one of two. Wherein, the processor 110 is an MPU, MCU or EDSP, et...
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The invention relates to an embedded system, in particular to an embedded system for correcting programs in a read only memory and a realization method thereof. The embedded system comprises a processor, the ROM, an OTP, a monitoring circuit, an either-or controller and the like. A main body of the embedded system adopts the ROM for storage and adopts the OTP to correct faulty programs in the ROM; the OTP and the ROM share an address wire; an address on the address wire is monitored through the monitoring circuit; and the either-or controller controls the selection of the programs in the ROM or selects an instruction of jumping to the OTP according to the monitored address. The system and the method solve the problem that the ROM of a chip of the embedded system cannot be modified, and save the cost when the risk of the chip of the embedded system is reduced, so the system and the method have important application value.
Description
technical field [0001] The invention relates to an embedded system, in particular to a read-only memory in the embedded system. Background technique [0002] Embedded system is a special computer system embedded in the controlled device and designed for specific applications. It is characterized by small system core, strong specificity, and software solid-state storage. Traffic management, industrial control, POS network and e-commerce and other fields. [0003] The core component of an embedded system is an embedded microprocessor (Micro Processor Unit, MPU) or an embedded microcontroller (Microcontroller Unit, MCU) or an embedded DSP processor (Embedded Digital Signal Processor, EDSP). MPU, MCU, and EDSP work in a system designed for a specific user group. It integrates many tasks completed by the board in the general-purpose CPU inside the chip, so that the system design tends to be miniaturized and has high efficiency and reliability. sex. [0004] At present, there a...
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IPC IPC(8): G06F9/445
Inventor 史岩
Owner HAIER BEIJING IC DESIGN