Post Package Repair Fuse Resource Detection
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Solution Overview
Problem
In semiconductor memory devices, the post package repair method faces challenges in efficiently utilizing and managing fuse resources, leading to reduced production yield due to defective cells and inadequate recognition of available fuses, resulting in repeated rupture operations without maximizing fuse usage.
Innovation Solution
A post package repair device with a resource detection unit and Array Rupture Electrical (ARE) fuse array unit that scans and outputs fuse resource information, allowing for controlled rupture operations and preventing repeated ruptures by determining the availability of fuses across bank groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuse resources are shared across bank groups during post package repair, then the number of available fuses is reduced, but device complexity is reduced
Solution Approach 1:
The fuse array is segmented into multiple bank groups, where each bank group has its own dedicated fuses. This segmentation allows independent management and tracking of fuse resources in each bank group, preventing the complexity reduction from fuse sharing while maintaining full availability of fuses across all banks.
Solution Approach 2:
The fuse resource detection mechanism is designed to universally detect and manage fuses across all bank groups. The system can identify available fuses in any bank group and coordinate rupture operations across multiple banks, allowing a single fuse to serve multiple repair purposes without reducing the total number of available fuses.
2Measurement precision
If fuse availability is not properly tracked, then rupture operations can be repeated, but measurement precision of fuse resources is improved
Solution Approach 1:
The system implements a feedback mechanism where the fuse resource detection unit continuously monitors the state of fuses in each bank group and provides real-time information to the control logic. This feedback prevents repeated rupture operations by alerting the system when fuses have already been ruptured or are unavailable, while maintaining precise tracking of fuse resource status.
Solution Approach 2:
The fuse resource detection unit performs preliminary detection of fuse availability before rupture operations are executed. By identifying and recording the state of fuses in advance, the system prevents repeated rupture attempts on already ruptured fuses, ensuring both accurate measurement of fuse resources and reliable repair operations.
3Productivity
If independent bank fuse allocation is used, then each bank can maximize fuse usage, but device complexity increases
Solution Approach 1:
The fuse array is segmented into multiple bank groups, where each bank group has its own dedicated fuses. This segmentation allows independent management and tracking of fuse resources in each bank group, preventing the complexity reduction from fuse sharing while maintaining full availability of fuses across all banks.
Solution Approach 2:
Each bank group independently manages its own fuse resources through the detection unit, which automatically identifies available fuses and coordinates rupture operations within that bank group. This self-service approach allows each bank to maximize its fuse usage without requiring complex centralized management, as each bank group autonomously tracks and utilizes its allocated fuses.
Data Source
AI summary
A post package repair device may include a plurality of bank groups, each of the plurality of bank groups including fuses indicating repair information, configured to share a predetermined number of fuses. The post package repair device may include a resource detection unit configured to determine the availability of the fuses from among the plurality of bank groups.