Memory access controller and method of accessing memory

Abstract

A memory access controller and a method of accessing a memory are provided. According to the invention, the program and the data address are decoupled through the address table. According to the storage access controller and the storage control method, wrong data access is avoided through the permission table, access conflicts are avoided through the state table, wrong data reading is avoided through verification, data reliability is improved through backup, and various technical means are comprehensively applied to perfect the storage access controller and the storage control method. The storage access controller comprises an address table, a permission table, a state table and a reader-writer, the address table records data block addresses, the permission table records the access permission of the threads to the data blocks, and the state table records the states of the data blocks. The reader-writer receives the access request and executes the received access request according to the configuration information of the address table, the authority table and the state table.

Description

Technical field [0001] The invention relates to the field of satellites, in particular to a satellite storage access controller and a method for accessing storage. Background technique [0002] Non-Volatile Memory (NVM, Non-Volatile Memory) is a kind of memory whose data will not disappear even when its power is turned off. Commonly used NVM includes read-only memory (ROM), programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), or non-type flash memory (NOR FLASH), and non-type flash memory (NAND FLASH) ). [0003] Satellite computers often use non-volatile memory to store application programs and important data. In order to avoid conflicts during the NVM access process, in the prior art, the NVM management method in the satellite computer system is usually as follows: [0004] 1. In the system design stage, the system engineer specifies the storage address and read-write time window for various data, and writes the assigned value into ...

AI Technical Summary

Problems solved by technology

The program directly accesses the memory, so the contents of the memory may be incorrectly modified

[0009] 2. Difficult to maintain; strong coupling between programs and data addresses

In addition, it is necessary to keep the addresses in the program, the actual data address, and the address of the data in the interface file consistent in multiple places, resulting in complicated maintenance

[0010] 3. The design is complex: when the program is running, multiple threads may have simultaneous read and write access conflicts for the same data block. In order to avoid access conflicts, it is necessary to allocate read and write time windows for threads during program design

Under complex tasks, it is difficult to comprehensively plan the time window

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