A data cache transmission method based on nand Flash chip and its controller

Abstract

The invention discloses a data cache transmission method based on a Nand flash chip and a controller of the method. The design and method that a master control cache is flexibly connected with ECC modules and flash memory controllers of channels are adopted. The method is mainly characterized in that caches are divided and grouped to carry out control and therefore can be flexibly in connected one or more ECC modules and the channels. Whether one or more ECC modules are adopted in the system, as long as cache sets are free, the system can perform data transmission with the ECC modules, and a target channel can be selected to complete caching and data transmission between the channels. Parallel data transmission can be carried out between different cache sets, parallel data transmission also can be carried out between the caches inside the same cache set, parallel transmission of Nand Flash data of the same page between the ECC modules and the caches and parallel transmission between the caches and the channels can be achieved, and the data transmission efficiency is improved.

Description

technical field [0001] The invention relates to the design field of a Nand Flash controller, in particular to a Nand Flash chip-based data buffer transmission method and a controller thereof. Background technique [0002] The structure of the existing Nand Flash controller generally includes an ECC generation and verification module, a data cache and a channel control module: wherein, the ECC generation and verification module is used to generate an ECC verification code when writing data, and write it into the NandFlash , verify the read ECC code when reading data; the data cache is used to store the data read from Nand Flash or to be written into Nand Flash; the channel control module controls each internal module to coordinate the use of the data cache and the interface of Nand Flash . [0003] The organization method of the Nand Flash controller in the prior art is that each channel has a fixed cache corresponding to itself, and other channels cannot be used. The organi...

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Problems solved by technology

[0004] 1. Use one cache to connect all channels, and use one ECC module, such as figure 1 As shown, this organization method has the following disadvantages: it needs to wait during the data transmission process, and the various resources of the ECC module and its front end are in an inefficient use state; the transmission efficiency of the entire data transmission path is not high

[0005] 2. Use multiple caches to connect multiple channels, and each cache corresponds to a channel, using an ECC module, such as figure 2 As shown, this organization method, compared with method 1: data transmission adopts a simple pipeline method. Although the efficiency is improved, multiple caches will significantly increase the area and cost of the main control chip.

[0006] 3. Use multiple caches to connect multiple channels, and each cache corresponds to a channel, using multiple ECC modules, such as image 3 As shown, this organization method, compared with methods 1 and 2, adds multiple ECC modules, so that the output of the ECC modules can work in parallel, but if only one page of data is transmitted, the defects of the above two methods also exist, and The same number of ECC modules and channels leads to waste of resources and increases the area and cost of the main control chip

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