Disguised Test Pads in Semiconductor Packages
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Solution Overview
Problem
The existing semiconductor memory devices face challenges in protecting the internal memory content from unauthorized access through test pads, as users are concerned about the visibility of these pads, leading to inefficiencies in testing methods.
Innovation Solution
The semiconductor package incorporates test pads shaped as letters or objects to disguise their function, and a cover with markings to conceal their purpose, allowing for effective testing without revealing their accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If test pads are made visible and accessible for testing, then testing efficiency is improved, but security against unauthorized access deteriorates
Solution Approach 1:
The test pads are disguised by changing their visual appearance through markings, patterns, or color codes that make them indistinguishable from regular circuit patterns. This allows the test pads to remain accessible for authorized testing while preventing unauthorized users from identifying and accessing them, thus resolving the contradiction between testing efficiency and security.
2Object-affected harmful factors
If test pads are concealed completely, then security is improved, but testing capability deteriorates
Solution Approach 1:
An intermediary coding system is introduced between the test pad and the user. The test pads are marked with specific codes, patterns, or colors that serve as a secret language known only to authorized testers. This intermediary layer maintains security by concealing the test pads from unauthorized users while preserving full testing capability for those who know the coding system.
3Ease of manufacture
If standard test pad patterns are used, then manufacturing simplicity is maintained, but recognizability and security deteriorate
Solution Approach 1:
The visual parameters of the test pads are changed by applying markings, patterns, or color codes during the manufacturing process. These changes can be integrated into existing photolithography or printing processes, maintaining manufacturing simplicity while significantly reducing the recognizability of test pads. The coding system can be applied as a thin layer or pattern that does not add substantial manufacturing complexity.
Data Source
AI summary
A method of forming a semiconductor package is disclosed including disguising the test pads. Test pads are defined in the conductive pattern of the semiconductor package for allowing electrical test of the completed package. The test pads are formed in shapes such as letters or objects so that they are less recognizable as test pads.