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A kind of access method and device of nand Flash interface

An access method and interface technology, applied in the direction of input/output to record carrier, etc., can solve the problems of complex circuit design, adding logic circuits, unfavorable maintenance, etc., and achieve the effect of saving time and cost

Active Publication Date: 2016-03-16
HUNAN GOKE MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the existing practice, every time a new NAND Flash interface feature needs to be adapted, a logic circuit must be added to the controller chip, making the circuit design more and more complicated, which is not conducive to maintenance
There may also be a risk that logic circuits cannot be added to the original design to support new functions
These shortcomings will bring huge overhead in time and cost to product development

Method used

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  • A kind of access method and device of nand Flash interface
  • A kind of access method and device of nand Flash interface
  • A kind of access method and device of nand Flash interface

Examples

Experimental program
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Embodiment Construction

[0027] First, a series of instructions need to be defined to operate the interface of NAND particles.

[0028] The following is an example of an instruction with a width of 32 bits, and the meanings of each bit are listed in the table.

[0029] Item Width Description ALE [1:0] ALE command: 00-clear; 01-set; 10-reverse; 11-no operation CLE [3:2] CLE command, same as ALE REN [5:4] REN command, same as ALE Wen [7:6] WEN command, same as ALE DQS [9:8] DQS command, same as ALE CEN [13:10] Data sent to CE REV [15:14] Reserved, not used DQ [23:16] Data sent to DQ wait [31:24] After executing this command, the time to keep (number of cycles)

[0030] In the application layer, prepare the instruction set according to the NAND particle operation to be realized. For example, if you want to perform the data writing operation of the asynchronous interface of NAND particles, the instruction set can be:...

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Abstract

The invention discloses an access method and device of a NAND Flash interface. The access method comprises the steps that 1 a series of orders, to operate the interfaces of NAND granules, are defined; in an application layer, according to the NAND granule operations to be achieved, order sets are prepared according to the agreement of the NAND granules; 3 the order sets are analyzed in a physical layer, the interfaces of the NAND granules are driven, the time sequence of the interfaces is controlled, the order sets in the step 2 is executed, and access of the interfaces of the NAND granules is achieved. According to the access method and device of the NAND Flash interface, design of a logic circuit is not needed, and the change of the interfaces is controlled through the defined orders to achieve the access to the NAND granule interface. The defined order can support the access to existing NAND granules, by the combinations of the orders, new conditions occurred in the future development of the NAND Flash can be replayed, adding hardware anew to achieve is not needed, and both time and cost are greatly saved.

Description

technical field [0001] The invention relates to a method and device for accessing a NAND Flash interface. Background technique [0002] NAND flash memory (ie, NAND) has the advantages of large capacity and fast rewriting speed, and is suitable for storing a large amount of data, so it has been more and more widely used in the industry. If you want to read and write NAND in a system, you need a hardware controller to convert the reading and writing of the system into reading and writing under the interface defined by the NAND particles. figure 1 It is a schematic diagram of the interface of NAND particles, where RE and DQS are differential signals. figure 2 It is a schematic diagram of the structure of the system for reading and writing NAND particles. [0003] With the continuous development of major NANDflash manufacturers, there are many types of NANDflash. From the interface point of view, there are five types of interface definitions: asynchronous interface, toggle1,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/06
Inventor 祝博马翼田达海
Owner HUNAN GOKE MICROELECTRONICS