Resistive Memory Selective Write With Adaptive Reference Resistance
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Solution Overview
Problem
MRAM memory devices require large currents and high voltages for writing, leading to high power consumption, and the reliability of selective write methods is compromised due to unreliable read-before-write operations.
Innovation Solution
A resistive memory device with a reference resistance circuit, sense amplifier, write driver, and selective write controller that adjusts the reference resistance value based on write data during a read-before-write operation to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a read-before-write operation is performed to enable selective write method, then power consumption is reduced, but reliability deteriorates due to unreliable read operation
Solution Approach 1:
The sense amplifier compares the resistance value of the memory cell with an adjusted reference resistance value to accurately determine the existing data. This improved comparison accuracy ensures reliable read-before-write operation, enabling trustworthy selective write method that can reduce power consumption by skipping unnecessary writes
2Reliability
If large current and high voltage are applied for write operation, then data writing is achieved, but power consumption increases
Solution Approach 1:
A read-before-write operation is performed before the write operation to check the existing data in the memory cell. This preliminary action enables the selective write method, which only performs actual write operation when necessary, thereby reducing overall power consumption while maintaining data writing capability
Solution Approach 2:
The sense amplifier compares the resistance value of the memory cell with an adjusted reference resistance value to accurately determine the existing data. This improved comparison accuracy ensures reliable read-before-write operation, enabling trustworthy selective write method that can reduce power consumption by skipping unnecessary writes
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
The solution enhances the reliability of selective write operations by accurately determining whether to write data, reducing power consumption and improving data integrity.
Implementation Method 1
a sense amplifier configured to read existing data stored in the at least one memory cell by comparing a resistance value of the at least one memory cell with the reference resistance value of the reference resistance circuit
Implementation Method 2
The write operation of MRAM is performed by activating the access transistor through the word line and applying a large current so that the data of the MTJ element can change
Data Source
AI summary
A resistive memory device performs a selective write operation. Included in the resistive memory device are at least one memory cell, a reference resistance circuit whose resistance value is adjusted, a sense amplifier configured to read data stored in the at least one memory cell by comparing a resistance value of the at least one memory cell with a resistance value of the reference resistance circuit, a write driver configured to program write requested data into the at least one memory cell, and a selective write controller. The selective write controller performs a read-before-write operation by adjusting the resistance value of the reference resistor circuit according to the write data during the selective write operation.