Writing control device and method

Abstract

The invention relates to a writing control device. The device is arranged between a system bus and a memory and comprises a caching module, a detection module, a first writing-in module and a second writing-in module, wherein the detection module is used for detecting the status of the system bus; the first writing-in module is used for writing content continuously written by the system bus in the caching module when the status of the system bus is continuous writing-in status; the second writing-in module is used for suspending reading operation of the system bus when the status of the system bus is reading status and writing content cached in the caching module in the memory. The device is used for reducing the writing-in frequency of the memory and improving the writing-in efficiency of the memory.

Description

technical field [0001] The invention relates to the field of embedded systems, in particular to a writing control device and method. Background technique [0002] Today, with the development of electronic information, embedded systems are widely used, including home appliances, automotive electronics, aerospace, finance, personal consumer products and other fields. Embedded systems usually include a microcontroller and a non-volatile memory (Non Volatile Memory, NVM for short) used to store instructions and data. Programmable Read-Only Memory, referred to as: EEPROM) and EFLASH to achieve. Microcontrollers need to access these NVMs to complete instruction reading and data storage operations, and the reading speed of these NVMs is generally relatively fast, while the writing speed is relatively slow, so how to improve the writing speed of NVM Efficiency is an important issue. [0003] At present, the memory generally adopts the method of page writing to improve the writing...

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Problems solved by technology

[0003] At present, the memory generally adopts the method of page writing to improve the writing efficiency. For the case of writing a large amount of data, the data is written in pages. In this way, performing an erase operation on the content of the same page can solve the problem caused by repeated erasing and writing. The problem of reduced efficiency

But for the case of randomly writing a small amount of data, the small amount of data will be written on one page. If the memory adopts the page writing method, the entire page still needs to be written, which will cause a waste of time and reduce the storage capacity. write efficiency

[0004] In the prior art, when the bit width of the system bus is smaller than the bit width of the memory, the system bus sometimes issues half-word write and full-word write instructions in order to improve the execution efficiency. Width, so the system bus needs to perform more than two write operations to complete a half-word or full-word write operation instruction, that is, the system bus sends an instruction representing several consecutive write operations, for example: perform 4 consecutive write operations Operation instructions or instructions for two consecutive write operations, and at this time the memory will also perform a corresponding number of write operations, which increases the number of memory writes, and because each write to the memory takes a lot of time , thus reducing the write efficiency of the memory

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