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Data access control device and method

A control device and data access technology, which are applied in electrical digital data processing, memory systems, memory address/allocation/relocation, etc., and can solve problems such as time-consuming table lookup.

Active Publication Date: 2020-01-17
SILICON MOTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to access data, NAND flash storage devices need to spend a lot of time looking up the table

Method used

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  • Data access control device and method
  • Data access control device and method

Examples

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Embodiment Construction

[0059] Embodiments of the present invention will be described below in conjunction with related drawings. In these drawings, the same reference numerals represent the same or similar components or method flows.

[0060]It must be understood that words such as "comprising" and "comprising" used in this specification are used to indicate the existence of specific technical features, values, method steps, job processing, components and / or components, but do not exclude possible Plus more technical features, values, method steps, job processes, components, components, or any combination of the above.

[0061] Words such as "first", "second", and "third" used in the present invention are used to modify the components in the claims, and are not used to indicate that there is a priority order, a prior relationship, or a component is prior relative to another component, or the chronological order in which method steps are performed, is only used to distinguish components with the sam...

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Abstract

An embodiment of the present invention provides a data access control device including at least a processing unit for searching for logical-physical (L2P) comparison information corresponding to a write operation and obtaining a first logical address associated with user data stored in a space of each physical address and a second logical address associated with the user data stored in a space ofa next physical address; generating content of multiple entries in a linked L2P comparison subtable, wherein each entry records a physical address of a corresponding first logical address and a secondlogical address; and storing the linked L2P comparison subtable. The linked L2P comparison sub-table can be used to generate the physical-logical (P2L) comparison table to be used; a defect that as the physical-logical (P2L) comparison table is generated and stored after data write-in operation, content incorrectness is generated after data updating can be overcome.

Description

technical field [0001] The invention relates to a flash storage device, in particular to a data access control device and method. Background technique [0002] Flash storage devices are generally classified into NOR (or not) flash storage devices and NAND (nand not) flash storage devices. The NOR flash storage device is a random access device. The host (Host) can provide any address to access the NOR flash storage device on the address pin, and obtain the data stored at the address from the data pin of the NOR flash storage device in time. on the data. In contrast, NAND flash storage devices do not have random access, but sequential access. The NAND flash storage device cannot access any random address like the NOR flash storage device. Instead, the host side needs to write the value of the sequence of bytes (Bytes) into the NAND flash storage device to define the request command (Command). Type (eg, read, write, erase, etc.), and the address used on this command. The ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/02
CPCG06F12/0246
Inventor 邱慎廷
Owner SILICON MOTION TECH CORP
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