Dual-Function I/O Buffer for Flexible Analog-Digital SoC Test Pins
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Solution Overview
Problem
The complexity and cost of manufacturing test coverage for Systems on a Chip (SoC) are increased due to the need for numerous analog test pins, which limit the number of digital test pins and result in longer test times for digital logic, as existing technologies require separate analog and digital input/output connections.
Innovation Solution
Implementing dual function input/output buffers that can operate as both analog and digital connections, allowing automated test equipment to dynamically allocate testing functions and optimize parallel testing without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate analog and digital input/output connections are used, then analog test coverage is improved, but the number of available digital test pins is reduced and test time increases
Solution Approach 1:
The patent implements I/O buffers that can dynamically switch between analog and digital modes, allowing the same physical pin to serve multiple functions. The buffer circuit includes switching mechanisms that configure the I/O path according to the selected mode, enabling a single pin to be universally used for either analog or digital testing without requiring separate dedicated pins for each type.
2Productivity
If more analog test pins are added, then analog module parallel testing is improved, but package cost increases and digital test pin availability decreases
Solution Approach 1:
The patent creates universal I/O pins that can be configured as either analog or digital test pins through mode selection circuitry. This allows the same physical pins to be reused for different test types, increasing the effective number of available test pins without physically adding more pins to the package, thereby reducing package complexity while maintaining high parallel testing capability.
Solution Approach 2:
The patent employs dynamic mode switching within the I/O buffers, allowing the system to adaptively change between analog and digital modes based on testing requirements. This dynamic reconfiguration enables flexible allocation of test resources, maximizing the utilization of available pins for parallel testing of both analog and digital modules without requiring a fixed, complex package layout.
3Reliability
If dedicated analog test pins are used, then analog testing performance is maintained, but the overall I/O flexibility is reduced
Solution Approach 1:
The patent implements I/O buffers with dual-mode capability that can operate as either analog or digital interfaces. The buffer circuit includes switching mechanisms that preserve analog signal integrity when in analog mode while maintaining full digital functionality when switched to digital mode, thereby providing both dedicated performance and flexible adaptability from a single unified interface.
Data Source
AI summary
A method and circuitry that enables an input/output pin (I/O) on a System on a Chip to function either as an analog or as a digital input/output without compromising the overall performance of the system, thus giving the automated test equipment full flexibility to maximize parallel testing for both analog and digital modules.