Interface Die Data-Transfer Test Mode for Early Debugging
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Solution Overview
Problem
The challenge lies in efficiently testing and debugging interconnected die architectures in memory systems before integration, as identifying issues at a later stage can be costly and time-consuming, particularly in low-power and energy-efficient memory designs where rapid prototyping and validation are crucial.
Innovation Solution
A data-transfer test mode is introduced, allowing the interface die to perform write operations and test data transfer independently before integration, enabling early-stage testing and debugging of interconnected die architectures, such as those in low-power memory devices, by utilizing data-transfer test-mode circuitry to reroute and evaluate data intended for linked dies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If interconnected die architectures are tested only after integration, then device complexity is reduced, but manufacturing precision and time consumption worsen due to costly and time-consuming debugging at later stages
Solution Approach 1:
The patent implements preliminary testing of interface dies before they are integrated into interconnected die architectures. The data-transfer test mode allows interface dies to be tested independently in advance, enabling early detection of manufacturing defects and reducing debugging time and costs associated with post-integration testing.
2Manufacturing precision
If interface dies are tested independently before integration, then manufacturing precision improves, but device complexity increases due to additional test-mode circuitry
Solution Approach 1:
The patent designs test-mode circuitry that can operate in multiple modes: normal operational mode for standard memory operations and data-transfer test mode for independent interface die testing. This multi-functionality allows the same circuitry to serve both testing and operational purposes, reducing the need for separate dedicated test equipment and minimizing the increase in device complexity.
Solution Approach 2:
The patent introduces an intermediary data-transfer test mode that acts as a bridge between independent interface die testing and integrated architecture operation. This intermediary mode enables controlled data transfer testing without requiring full integration, allowing manufacturers to test interface dies in isolation while using standardized test protocols that simplify the testing process.
3Productivity
If data transfer testing is enabled before integration, then productivity improves through early issue identification, but energy consumption increases due to additional testing operations
Solution Approach 1:
The patent implements periodic testing of interface dies at strategic points during the manufacturing process using the data-transfer test mode, rather than continuous testing. This periodic approach allows for early identification of manufacturing defects and process adjustments, improving productivity while minimizing energy consumption by activating test operations only when needed during manufacturing cycles.
Data Source
AI summary
Apparatuses and techniques for implementing a data-transfer test mode are described. The data-transfer test mode refers to a mode in which the transfer of data from an interface die to a linked die can be tested prior to connecting the interface die to the linked die. In particular, the data-transfer test mode enables the interface die to perform aspects of a write operation and output a portion of write data that is intended for the linked die. With the data-transfer test mode, testing (or debugging) of the interface die can be performed during an earlier stage in the manufacturing process before integrating the interface die into an interconnected die architecture. For example, this type of testing can be performed at a wafer level or at a single-die-package (SDP) level. In general, the data-transfer test mode can be executed independent of whether the interface die is connected to the linked die.