Configurable Word Line Driver Circuit for Flash Memory Bias Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for testing and adjusting word line bias patterns in flash memory devices require hardware changes, which are costly and time-consuming, as the patterns are 'hard-wired' into metal masks, necessitating new prototypes for each pattern change.
Innovation Solution
A word line driver circuit with a register that can be loaded with different bias patterns, allowing test engineers to adjust and test various bias patterns without hardware changes, using a decoder and multiplexer to configure the driver circuit to apply specific voltages to word lines during programming, read, or erase operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If word line bias patterns are hard-wired into metal masks, then manufacturing precision is maintained, but device complexity increases and adaptability decreases
Solution Approach 1:
The patent transforms static hard-wired bias patterns into dynamic configurable patterns by introducing a register that can be loaded with different bias pattern data. This allows the word line driver circuit to adaptively apply different bias patterns during testing without hardware changes, resolving the contradiction between manufacturing precision and adaptability.
Solution Approach 2:
The patent enables changing the bias pattern parameters through software configuration rather than hardware modification. By loading different values into the register, various bias patterns can be tested while maintaining manufacturing precision through controlled application of voltages to word lines.
2Adaptability or versatility
If hardware changes are made to test different bias patterns, then adaptability improves, but loss of time and productivity decrease
Solution Approach 1:
The patent creates a software-based copy mechanism where bias patterns are stored as data in a register rather than being physically hard-wired. This allows rapid copying and switching between different bias patterns through data loading, eliminating the time-consuming process of creating new hardware prototypes for each pattern variation.
3Adaptability or versatility
If hardware changes are made for each bias pattern, then adaptability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a universal word line driver circuit that can handle multiple bias patterns through a single configurable register. This multi-functional approach allows the same hardware to perform various testing configurations, reducing overall device complexity while maintaining high adaptability for different testing scenarios.
Data Source
AI summary
Memory devices including an array of memory cells, a plurality of access lines selectively coupled to respective pluralities of memory cells of the array of memory cells, a plurality of first registers, a second register, a first multiplexer, a second multiplexer, and a decoder configured to selectively connect a corresponding access line to a selected voltage source of a plurality of voltage sources in response to the output of the second multiplexer, wherein the second multiplexer is configured to pass a selected one of the output of the second register and the output of the first multiplexer to its output, and wherein the first multiplexer is configured to pass a selected one of the outputs of the plurality of first registers to its output.