Nonvolatile Memory Redundancy Block Layout Optimization
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Solution Overview
Problem
The existing nonvolatile memory devices using phase change materials face inefficiencies in memory cell repair due to the complex layout and increased block area required for providing repair information between separated write and read circuit blocks, which complicates the repair process.
Innovation Solution
A nonvolatile memory device with a redundancy block positioned closer to the read circuit block than the write circuit block, which compares the repair address of a faulty memory cell with the input address to generate and supply redundancy control signals to both blocks, reducing the number of signals needed for repair operations and simplifying the layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the write circuit block and read circuit block are spaced apart, then the repair information transmission path becomes longer and more complex, but separating the circuit blocks is necessary for functional organization
Solution Approach 1:
The patent introduces a redundancy block as an intermediary component positioned between the write circuit block and read circuit block. This redundancy block receives repair information from the write circuit block, processes it, and provides it to the read circuit block, thereby simplifying the direct transmission path and reducing layout complexity while maintaining repair reliability
Solution Approach 2:
The patent positions the redundancy block in a specific spatial arrangement - closer to the read circuit block than the write circuit block. This spatial reconfiguration creates a more efficient signal transmission path geometry, reducing the overall complexity of the repair information transmission network
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances repair efficiency by reducing the complexity of signal transmission and layout, allowing for more streamlined repair operations within the memory device.
Implementation Method 1
when a phase change material is heated and then cooled, its state rapidly changes into a crystalline state or an amorphous state
Data Source
AI summary
A nonvolatile memory device that employs a variable resistive element includes: a memory cell array having a plurality of memory cells; a first circuit block that is disposed at one side of the memory cell array and performs a first operation on the memory cells; a second circuit block that is disposed at the other side of the memory cell array and performs a second operation on the memory cells, wherein the second operation is different from the first operation; and a redundancy block that is disposed closer to the second circuit block than the first circuit block, and which compares a repair address of a repaired memory cell among the plurality of memory cells with an input address to then generate a redundancy control signal, and to supply the redundancy control signal to the first circuit block and the second circuit block.