SSD master control Buffer, SSD master control and SSD unaligned write data transmission control method

Abstract

The invention discloses an SSD master control Buffer, SSD master control and an SSD unaligned write data transmission control method. In a whole read filling process, a CPU only participates in one step, and buffer application, data synchronization and buffer release are completed automatically by logics according to data transmission control rules, so that the ability of the CPU to process other events is improved. In the method, once Read DMA completes write of data of part 2 and part 3, RD flags where the part 2 and the part 3 are located are set, and even if data of part 1 are not ready, the Read DMA still executes read operation on part 1+ part 2 + part 3 immediately, so that Read DMA waiting time is shortened greatly, and DMA intertransmission efficiency is improved effectively.

Description

technical field [0001] The invention relates to the field of SSD data reading and writing, in particular to a SSD master control buffer, SSD master control and SSD non-aligned write data transmission control method. Background technique [0002] In the mainstream SSD master control, the front end must read and write data according to the sector (512Byte) length data alignment, while the SSD often uses the unit (unit size is 4KByte or 8KByte) alignment to flush data and check table entries for convenient management. Unaligned write refers to the write behavior that the range of read and write data is not aligned according to the unit, such as figure 1 shown. exist figure 1 In the scenario, it is necessary to fill in the unaligned part (yellow area) through a read operation. This filling operation is called read filling. After completing the filling, the data is downloaded to the flash and the table is changed. [0003] to combine figure 1 , figure 2 The existing methods...

AI Technical Summary

Problems solved by technology

[0021] The technical problem to be solved by the present invention is to provide a SSD master control Buffer, SSD master control and SSD non-aligned write data transmission control method to solve the problem that the existing non-aligned write method takes up more CPU time resources. , The problem of low transmission efficiency between DMAs, improve the efficiency of data transmission between DMAs, reduce invalid waiting, and finally improve SSD data throughput

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