Data processing method of solid-state hard disk and solid-state hard disk

Abstract

The embodiment of the present application discloses a data processing method for a solid-state hard disk and a solid-state hard disk, which are used to apply for a buffer RAM address through a back-end management unit, and use the buffer RAM storage space corresponding to the buffer RAM address to improve the performance of the solid-state hard disk read operation. The method of the embodiment of the present application includes: the front-end management unit receives a read operation request sent by the host; the front-end management unit sends the read operation request to the back-end management unit, and the read operation request includes the setting information of the RAM address of the random access memory that the read operation needs to use, The read operation request is used to instruct the back-end management unit to read the user data in the computer flash memory module NAND into the buffer RAM storage space corresponding to the buffer RAM address, and the front-end management unit sends the user data in the buffer RAM storage space to the host; the front-end The management unit receives the message that the read operation has been completed sent by the back-end management unit, the buffer RAM address in the RAM address in the message; the front-end management unit sends the user data in the buffer RAM storage space to the host.

Description

technical field [0001] The present application relates to the field of data processing, in particular to a data processing method of a solid-state hard disk and the solid-state hard disk. Background technique [0002] Solid state drives (SSD) are composed of a control unit and a storage unit. Solid-state drives usually read user data stored in computer flash memory (NAND flash memory, NAND for short) into random access memory (RAM). When the host sends a request to the solid-state drive, the solid-state drive will store the user data Read out from the NAND, and then transfer the data to the host through a group data transfer (direct memory access, DMA) method that does not require a central processing unit (CPU) to perform a transfer operation. In the case that the operation time of reading user data into NAND and the time of transferring user data through DMA are fixed, the access rate of transferring user data stored in NAND to RAM after reading out will determine the rea...

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Problems solved by technology

[0004] However, due to the limited cache RAM space, usually only 1MB capacity, and the space capacity of DDR SDRAM can reach 2GB or 4GB, after the front-end management unit receives the read operation request, it will apply for the RAM address including the buffer RAM address, and the front-end After the management unit applies for the buffer RAM address, it needs to send the applied buffer RAM address to the back-end management unit, and the back-end management unit executes the read operation, which causes the front-end management unit to send the buffer RAM address to the back-end management unit During the process, the RAM storage space corresponding to the RAM address has been occupied, so the cache RAM storage space is not fully utilized, which reduces the time for the cache RAM storage space to store data and reduces the turnover rate of the cache RAM storage space, resulting in SSD read performance is poor

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