Nonvolatile Memory Page Buffer Circuit Copyback Randomization

Solution Overview

Problem

Existing nonvolatile memory devices face inefficiencies in data transfer and computational overhead during copy back operations due to the lack of effective methods for simultaneous randomization and de-randomization of data in multi-level and three-dimensional memory cell arrays.

Innovation Solution

A method involving a page buffer circuit and randomization interface that performs bit-wise XOR operations on random sequence data generated from source and target area addresses, allowing for simultaneous randomization and de-randomization of data during copy back programming operations, reducing data transfer and computational overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If traditional copy back operations are performed without simultaneous randomization, then data transfer overhead increases, but computational overhead also increases due to separate randomization steps

Engineering Contradiction:

Improvedata transfer overheadVSAvoidcomputational overhead

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent combines the randomization operation with the copy back operation into a single integrated process. The page buffer circuit performs bitwise XOR operations between the first random data and generated third random sequence data simultaneously while copying data from source to target area, eliminating the need for separate randomization steps and reducing both data transfer and computational overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent generates the third random sequence data in advance by performing bitwise XOR operations on the first random sequence data and second random sequence data before the actual copy back operation. This preliminary generation of randomized sequence data enables efficient simultaneous randomization during the copy back process without adding computational overhead during data transfer.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If separate randomization operations are performed before and after copy back, then data integrity is maintained, but operation time increases

Engineering Contradiction:

Improvedata integrityVSAvoidoperation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent merges the randomization operation with the copy back operation into a single integrated process. The page buffer circuit performs bitwise XOR operations between the first random data and generated third random sequence data simultaneously while copying data from source to target area, eliminating the need for separate randomization steps and reducing both data transfer and computational overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent enables continuous data processing by performing randomization operations continuously during the copy back process rather than in separate discrete steps. The bitwise XOR operations are executed continuously as data is being copied, maintaining data integrity while eliminating idle time between randomization and copy back operations.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If randomization is performed using separate processes, then data security is improved, but productivity decreases due to multiple operation steps

Engineering Contradiction:

Improvedata securityVSAvoidoperation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent combines the randomization operation with the copy back operation into a single integrated process. The page buffer circuit performs bitwise XOR operations between the first random data and generated third random sequence data simultaneously while copying data from source to target area, eliminating the need for separate randomization steps and reducing both data transfer and computational overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent enables continuous data processing by performing randomization operations continuously during the copy back process rather than in separate discrete steps. The bitwise XOR operations are executed continuously as data is being copied, maintaining data integrity while eliminating idle time between randomization and copy back operations.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS8990481B2Method of operating nonvolatile memory devices storing randomized data generated by copyback operation

Publication Date: 2015.03.24 SAMSUNG ELECTRONICS CO LTD

AI summary

In an operating method for a nonvolatile memory device, first random data is sensed from a source area of the memory cell array, the first random data having been generated using first random sequence data. While sensing the first random data, third random sequence data is loaded to a page buffer circuit, the third random sequence data being generated from the first random sequence data and second random sequence data. A logical operation is performed on the sensed first random data and the third random sequence data in the page buffer circuit to generate second random data, and the second random data is programmed to a target area in the memory cell array different from the source area.