MRAM-integrated memory card control chip and memory card

Abstract

The invention provides a memory card control chip. The memory card control chip comprises a CPU, a host interface, an NAND controller and an MRAM, wherein the host interface is used for being connected with a host; the NAND controller is used for being connected with one NAND chip or a group of NAND chips; and the CPU is connected with the NAND controller and the MRAM. The invention furthermore provides a memory card and a reading / writing method. According to the memory card control chip, the memory card and the reading / writing method, the MRAM is used for replacing an SRAM to be integrated in the memory card control chip, and the MRAM is capable of reading / writing rapidly and randomly, so that the writing performance can be ensured; NAND management software which is reliable, can be modified in the development process and even can be upgraded after the sale is stored in the MRAM, so that flexibility is provided; due to the use of the MRAM, writing cache or reading / writing cache can be provided to improve the reading / writing performance of the memory card; and meanwhile, the frequency of writing the NAND chip is decreased and the service life of the memory card is prolonged.

Description

technical field [0001] The invention relates to a memory card, in particular to a memory card control chip integrated with MRAM and a memory card. Background technique [0002] Memory card is a data storage device commonly used in electronic devices such as mobile phones, tablet computers, and digital cameras. It has various forms, such as SD card, Mini-SD card, micro-SD card (also known as T-Flash card) and MMC card, etc. etc. Most of them can be inserted into the device through the card slot. [0003] There are also some devices, such as eMMC, Movi-NAND of some manufacturers, etc., which are pasted on the motherboard by means of patches, but use the same interface as the memory card, and also have a very close internal structure, and they are also included here. for the memory card. [0004] The memory card is generally connected to the device through 4-8 data lines, and this type of interface is usually called SDIO. The storage medium of the memory card is NAND flash m...

AI Technical Summary

Problems solved by technology

[0010] (1) Poor performance:

[0011] SRAM is a kind of memory with high cost. The memory card used in consumer electronics is limited by the cost. It is impossible to use SRAM with large capacity, so it cannot provide write cache; and the writing speed of NAND is very slow, which seriously affects system performance;

[0012] 2. Poor reliability and short service life

Modern smart phones and other consumer electronics products are constantly writing operations at any time, often causing premature damage to the memory card, product scrapping, and data loss;

[0014] 3. Several methods of storing NAND management programs also have different problems

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