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A Quick Method to Evaluate Optimal Read Voltage

A read voltage, optimal technology, applied in the storage field, can solve problems affecting efficiency, etc., to achieve the effect of improving accuracy, increasing position difference, and improving evaluation efficiency

Active Publication Date: 2019-05-21
RAMAXEL TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Assuming that m levels need to be scanned, Vref Calibration for a word line needs to read 7*m pages of data, usually m is greater than 10, which will seriously affect the efficiency

Method used

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  • A Quick Method to Evaluate Optimal Read Voltage
  • A Quick Method to Evaluate Optimal Read Voltage
  • A Quick Method to Evaluate Optimal Read Voltage

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] figure 2 It is a schematic diagram of the theoretical value of the optimal read voltage. The abscissa indicates the voltage value of the cell, and the ordinate indicates the number of cells. The curve W1 indicates the voltage distribution of the cell whose write data is 1, and the curve W0 indicates the cell whose write data is 0. The voltage distribution diagram of the cell, Vref1, Vref2 and Vref3 are three kinds of read voltage Vref respectively, the cell...

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Abstract

The invention discloses a method for quickly assessing an optimal reading voltage. The method is characterized by comprising a statistics stage and a calibration stage; in the statistics stage, a difference value between a valley position of a voltage distribution curve of a storage unit of samples and an actual optimal reading voltage, an interpolation function and a sampling interval are obtained through sample statistics; and in the calibration stage, the optimal reading voltage of a to-be-operated data block of an actual FLASH is quickly assessed according to the difference value dv, the interpolation function and the sampling interval obtained in the statistics stage. According to the method, the data is assessed by adopting interval sampling, a combination method and an interpolation function, so that the data amount of assessment is greatly reduced, and the assessment efficiency is improved; and meanwhile, the position difference between an optimal voltage subjected to statistics assessment and the actual optimal voltage is increased, and the assessed voltage is further corrected, so that the accuracy is improved.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a method for quickly evaluating the optimal read voltage. Background technique [0002] Obtaining the optimal read voltage Optimal Vref is the basis for NFC to read Nand Flash. Optimal Vref directly affects the efficiency of NFC reading Nand and the effect of decoding. The traditional voltage calibration method Vref Calibration is currently the most widely used technology. By setting different reading voltages, the data on the entire word_line is read, including the low page, mid page, and up page. Therefore, it is necessary to read There are a lot of raw data to be taken. Taking TLC as an example, TLC has 7 levels of reading voltage. If each level is divided into 10 levels of statistics, the application needs to read 7*10 pages of data to complete the statistics of the entire word line. Therefore, there is a problem of too much statistical data; it is not accurate to actually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C13/00
CPCG11C13/004
Inventor 伦建坤郭超
Owner RAMAXEL TECH SHENZHEN