Method for expanding low-capacity NAND flash chips into high-capacity module

Abstract

The invention provides a method for expanding low-capacity NAND flash chips into a high-capacity module. In the method, a CPLD chip and 2 to 16 low-capacity NAND flash chips are combined to form a high-capacity NAND flash expansion module; after being programmed by a user, the CPLD chip can be automatically switched among different flash chips; the type of the CPLD chip is LC4128V from Lattice company, and the CPLD chip is used for switching the control signals of the NAND flash chips, decoding addresses and improving drive capability at the same time; and under the module, blocks of all the chips are uniformly addressed, a program sends a command about the selection of one of the flash chips to the CPLD chip, the CPLD chip determines to switch the control signal of an NAND flash chip controller to a specific flash chip according to an input address wire, and a CPU performs read-write operation on the flash chip. The high-capacity NAND flash expansion module can be widely applied to intelligent devices, data acquisition terminals, and the field of data storage which has strict requirements on module space and power consumption.

Description

technical field [0001] The invention relates to a technical field applied to intelligent equipment and large-capacity data storage, in particular to a method for expanding a small-capacity NAND FLASH chip into a large-capacity module. Background technique [0002] With the development of technology, more and more electronic products need more intelligence, which also puts forward higher requirements for the storage of data and programs of these products. NAND FLASH chips are increasingly developing in the need for large-capacity data storage. NAND FLASH chips can be seen in almost all digital products, but for occasions that require large capacities, such as more than 20GB, single-chip NAND FLASH chips It cannot be done, or even if it can be done, it is either inconvenient for ordinary users to purchase, or the supply is unstable. However, for NAND FLASH chips below 4GB, it is relatively easy to purchase and the supply is relatively stable, so it is considered to expand the...

AI Technical Summary

Problems solved by technology

NAND FLASH chips are increasingly developing in the need for large-capacity data storage. NAND FLASH chips can be seen in almost all digital products, but for occasions that require large capacities, such as more than 20GB, single-chip NAND FLASH chips It cannot be done, or even if it can be done, it is either inconvenient for ordinary users to purchase, or the supply is unstable

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