Edge Section Memory Cell Utilization via Universal Sense Amplifiers
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Solution Overview
Problem
In memory devices, the edge section of a memory cell array is not fully utilized due to the lack of a reference sense line for 1T1C sense amplifiers, leading to inefficiencies in data storage and processing.
Innovation Solution
A memory device with first and second sensing circuitry, including 2T2C and 1T1C sense amplifiers respectively, is positioned at the edges of the array, allowing for the utilization of edge section memory cells for error correction code and microcode operations, enabling efficient data processing and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 1T1C sense amplifiers are used in the edge section of the memory array, then device complexity is reduced and manufacturing is simplified, but the edge section cannot be fully utilized due to lack of reference sense line
Solution Approach 1:
The patent makes the sense amplifiers universal by enabling them to perform multiple functions: storing data bits and storing reference voltages. The sense amplifier can operate in different modes depending on whether it needs to sense data or hold reference voltage, allowing the same hardware structure to serve dual purposes and eliminate the need for separate reference sense lines.
Solution Approach 2:
The patent changes the operational parameters of the sense amplifier by introducing control signals that switch between different operating modes. The sense amplifier can be configured to either sense data from memory cells or maintain reference voltage levels, with the ability to transition between these states through parameter changes in its operational configuration.
2Device complexity
If edge section memory cells are left unused, then sensing circuitry design is simplified, but data storage capacity and processing efficiency are reduced
Solution Approach 1:
The sense amplifiers in the edge section are designed to be multi-functional, capable of both data storage and reference voltage maintenance. This universality allows the same circuitry to serve multiple purposes, increasing effective storage capacity without proportionally increasing circuit complexity.
Solution Approach 2:
The sense amplifiers serve themselves by maintaining their own reference voltage levels internally without requiring external reference sense lines. This self-service capability eliminates the need for additional dedicated reference lines while enabling full utilization of edge section memory cells.
3Reliability
If edge section is utilized for error correction code and microcode operations, then data processing efficiency and reliability are improved, but sensing circuitry complexity increases
Solution Approach 1:
The sense amplifiers are designed as universal units that can handle multiple types of operations including data sensing, error correction code storage, and microcode operations. This multi-functionality allows the same sensing circuitry to support enhanced reliability features without requiring separate dedicated circuits for each function.
Solution Approach 2:
The patent merges the functions of data storage, error correction, and microcode operations into a single integrated memory array structure. By combining these functions and using the same sense amplifiers for multiple purposes, the overall system achieves improved reliability while avoiding the complexity of separate dedicated circuits for each function.
4Measurement precision
If reference sense line is provided for each sense amplifier in the edge section, then sensing accuracy is improved, but manufacturing complexity and device area increase
Solution Approach 1:
The sense amplifiers in the edge section are self-sufficient, maintaining their own reference voltage levels without requiring external reference sense lines. This self-service approach preserves sensing accuracy while eliminating the need for additional reference lines that would increase device area and manufacturing complexity.
Solution Approach 2:
The patent extracts the reference voltage maintenance function from the external reference sense line infrastructure and incorporates it directly into the sense amplifier units themselves. This extraction eliminates the need for separate reference lines while maintaining the necessary sensing accuracy.
Data Source
AI summary
An example apparatus includes a memory device having first sensing circuitry positioned adjacent an edge of an edge array section and selectably coupled to a row memory cells, the first sensing circuitry including a first sense amplifier selectably coupled via a first sense line to a first memory cell in the row and via a second sense line to the first memory cell. The example apparatus includes second sensing circuitry positioned at an opposite edge of the edge array section and selectably coupled to the row via a third sense line, the second sensing circuitry including a second sense amplifier selectably coupled via the third sense line to a second memory cell in the row. The example apparatus further includes a component positioned outside the edge array section and proximate the first sensing circuitry, the component configured to perform an operation based on data sensed by the first sensing circuitry.