Half-Word Memory Device Shared Redundant Column
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Solution Overview
Problem
Conventional memory devices with a half-word architecture require multiple redundant columns and wordline gating, increasing circuit area, complexity, and manufacturing costs.
Innovation Solution
A memory device with a half-word architecture that uses a single redundant column for column redundancy, eliminating the need for wordline gating and reducing circuit area and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple redundant columns and wordline gating are used in conventional half-word architecture memory devices, then column redundancy repair capability is improved, but circuit area and complexity increase
Solution Approach 1:
The patent merges the redundant column resources of left and right segments into a single shared redundant column. The shift control circuitry dynamically redirects bitlines from either segment to this unified redundant column, eliminating the need for separate redundant columns in each segment and reducing overall circuit area while maintaining repair capability for both halves of the memory device
Solution Approach 2:
The single redundant column is designed to serve multiple functions: it can repair faults in both the left and right segments of the memory array. The shift control circuitry enables this universal repair capability by dynamically connecting bitlines from either segment to the shared redundant column based on where faults are detected, making the redundant column a multi-functional resource
2Reliability
If separate redundant columns are added to each segment (left and right), then fault coverage is improved, but manufacturing costs increase
Solution Approach 1:
The patent combines what would traditionally be two separate redundant columns (one for left segment, one for right segment) into a single shared redundant column. This merging reduces the total number of transistors and circuit elements required, directly lowering manufacturing costs while the shift control circuitry ensures both segments remain covered for fault repair
3Ease of operation
If wordline gating is implemented to control segments, then segment isolation is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the wordline gating mechanism from the system. Instead of using wordline gating to control segment access, the design relies on shift control circuitry that redirects bitlines to appropriate segments or the shared redundant column. This extraction eliminates the complexity of wordline gating while maintaining the ability to isolate and control segments through the shift control mechanism
Data Source
AI summary
A memory device includes a memory device and control circuitry. The memory array includes bitcells and bitlines connected to the bitcells. The bitcells are grouped into bitcell groups. The control circuitry is connected to the bitcell groups via the bitlines. The control circuitry adjusts connections with the bitcell groups to include a first bitcell group of the bitcell groups in memory operations and exclude a second bitcell group of the bitcell groups from the memory operations based on a half-word control signal being enabled.