Amending method for content of built-in program code of ROM

A read-only memory and program code technology, applied in program control devices, program loading/starting, etc., can solve problems such as costing a lot of time and money, inconvenient users, unable to change stored content or re-store data, etc.

Inactive Publication Date: 2007-05-30
MEDIATEK INC
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The general read-only memory can only read the stored data, but cannot change the stored content or re-store the data. When the user wants to modify the stored content, he can only replace the new read-only memory.
For example, when wanting to modify the stored content of the mask type ROM, the mask (mask) used to manufacture the ROM must be re-modified, and re-modifying the mask requires a lot of time and money, which is also quite expensive for the user. inconvenient

Method used

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  • Amending method for content of built-in program code of ROM
  • Amending method for content of built-in program code of ROM

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Embodiment Construction

[0019] In an embedded system, its architecture mainly includes hardware such as a microprocessor, read-only memory, random access memory, and input / output, and its software (program code) is stored in the read-only memory. With continuous progress, the embedded system has been integrated into a single chip. However, when the program code stored in the read-only memory needs to be changed or updated, it is faced with the dilemma of remanufacturing the entire single chip. The present invention proposes method can effectively solve this problem.

[0020] Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an embedded system part plus an external storage device. In the embodiment of the present invention, it can be applied to the architecture shown in FIG. 1 , and an external storage device is used to change or update the program code in the read-only memory.

[0021] As shown in Figure 1, the internal 01 of this system includes a read-only memory 02, a random ac...

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Abstract

The invention relates to a updating method of the ROM internal procedure code, the modification address and contents which are stored in a external memory are separately loaded to a delayed memory and a random access RAM, when the code program of the ROM is executed to modification address, it turns to the random access RAM to execute modification contents, the other program will be executed continuously after the modification contents are executed. With the method in the invention, part of the program can be updated without replacing the ROM.

Description

technical field [0001] The present invention relates to a modification method for modifying the built-in program code content (Code) of a read-only memory (ROM / Read Only Memory). Through the technical method disclosed in the present invention, when the content of the built-in program code of the read-only memory needs to be modified, There is no need to replace the read-only memory, and the purpose of modifying the content of the read-only memory is achieved by using an external storage device with a random access memory and a register. Background technique [0002] "System-on-chip" (System-on-chip, SOC), also known as "system chip" is the main trend of electronic technology. In the past, electronic components in complex circuits can be integrated into a single chip. Generally, this A system with a single integrated chip is called an embedded microprocessor system (EmbeddedMicroprocessor System). Usually this kind of embedded microprocessor system will use a read-only memor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/445
Inventor 苏肇平萧景瀚
Owner MEDIATEK INC
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