A kind of nand Flash controller and terminal and the method for controlling Nand Flash

Abstract

The invention discloses an NAND Flash controller and a terminal and a method and device for controlling an NAND Flash. The NAND Flash controller comprises a first register, a third register, an NAND Flash status machine circuit, a DPRAM (dual-port random access memory) signal input / output circuit, and a coding sub-module, wherein the NAND Flash status machine circuit is used for analyzing a command in the first register, writing the data needing to be written into the NAND Flash in the third register into a DPRAM signal input / output circuit when the analyzed command is a write-in command, and writing into the NAND Flash; the NAND Flash status machine circuit is used for reading a redundant code in a register block in an ECC production module after writing the data with the second preset length into the NAND Flash; the DPRAM signal input / output circuit is used for storing the data written by the NAND Flash status machine circuit; the ECC production module comprises the coding sub-module and the register block; the coding sub-module is used for performing coding operation on the data needing to be written into the NAND Flash according to the preconfigured error correcting ability to obtain the redundant code in the process that the NAND Flash status machine circuit writes the data needing to be written into the NAND Flash in the DPRAN signal input / output circuit into the NAND Flash, and then stores the redundant in the register block.

Description

technical field [0001] This article involves but is not limited to storage technology, especially a flash memory (Nand Flash) controller and terminal and a method for controlling Nand Flash. Background technique [0002] Flash memory (Nand Flash) has been widely used in large-capacity storage devices such as mobile phones and mobile memory cards. like figure 1 As shown, in order to ensure that error detection and correction can be performed when data is read, it is usually necessary to write a part of redundant data according to certain rules when data is written into NandFlash, and use error correction codec circuit to perform error detection and correction ( ECC, Error Code Correction) control. [0003] Related technical solutions: [0004] The error correction codec circuit used in the Nand Flash controller is not configurable for the error correction capability of ECC, and the adaptability will be affected. As the error correction capability increases, the area of ​​t...

AI Technical Summary

Problems solved by technology

[0007] First, the scalability is poor, because most of the error correction codec circuits in Nand Flash controllers are designed based on a specific application system or a specific Nand Flash

[0008] Second, the adaptability is poor. Some Nand Flash controllers have no data verification function, or the ECC verification ability is low, which cannot meet the error correction requirements of larger-capacity Nand Flash.

[0009] Third, the power consumption is high, which is mainly because many ECC designs use a large number of registers in pursuit of functions, and at the same time do not pay attention to reducing power consumption

[0010] Fourth, the transmission speed is slow

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