Replacing Flash Sense Circuitry with Non-Volatile Memory
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Solution Overview
Problem
Conventional flash memory devices face data loss during power failures due to the volatile nature of sense circuitry, which requires constant power to maintain stored information, and also have complex circuitry that can be improved for reduced size and increased speed.
Innovation Solution
The integration of emerging non-volatile memory elements, such as phase change random access memory (PCRAM), magnetoresistive random access memory (MRAM), or resistive random access memory (RRAM), replaces conventional cross-coupled inverters in the sense circuitry, allowing data to be retained without power and reducing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cross-coupled inverters are used in sense circuitry, then data can be stored temporarily during operation, but data is lost during power failures and standby power consumption is high
Solution Approach 1:
The patent changes the fundamental parameter of memory element volatility by replacing volatile inverter-based latches with non-volatile memory elements (PCRAM, MRAM, RRAM). This parameter change allows data to be retained without power, eliminating the contradiction between data retention reliability and standby power consumption.
Solution Approach 2:
The patent substitutes the mechanical/electrical inverter-based storage mechanism with emerging non-volatile memory mechanisms (phase change, magnetoresistive, or resistive effects). This substitution fundamentally changes how data is maintained, enabling persistence without continuous power while reducing standby consumption.
2Productivity
If conventional flash memory circuitry is used, then data storage function is achieved, but device footprint is large and processing speed is limited
Solution Approach 1:
The patent changes the operational parameters of the sense circuitry by using non-volatile memory elements with different electrical characteristics (resistive switching, phase change, magnetoresistive effects) compared to conventional CMOS inverters. These parameter changes enable faster write operations and reduced circuit complexity.
Solution Approach 2:
The patent substitutes conventional CMOS inverter-based logic with emerging non-volatile memory elements that inherently provide both storage and logic functions. This substitution reduces the number of components needed and simplifies the overall circuit architecture, leading to smaller device footprint and improved speed.
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 solution prevents data loss during power interruptions, reduces standby power consumption, and enables a smaller device footprint while potentially increasing the speed and efficiency of data processing in flash memory devices.
Implementation Method 1
phase change random access memory (PCRAM)
Implementation Method 2
magnetoresistive random access memory (MRAM)
Implementation Method 3
resistive random access memory (RRAM)
Data Source
AI summary
Memory devices and methods of operating memory devices are provided, such as those that involve a memory architecture that replaces typical static and/or dynamic components with emerging non-volatile memory (NV) elements. The emerging NV memory elements can replace conventional latches, can serve as a high speed interface between a flash memory array and external devices and can also be used as high performance cache memory for a flash memory array.