Vector Memory Test Device for Universal Semiconductor Memory Testing
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Solution Overview
Problem
The development of memory test devices is complex and time-consuming due to the need to set specific conditions for each semiconductor memory device, including the type of memory, standard specifications, test operations, memory cell ranges, and communication protocols.
Innovation Solution
A test device comprising a vector memory, a test control circuit, and a physical layer, which communicates with external memory devices through data lines and a command/address line. The test device uses vector data to transmit memory requests, addresses, and data, and compares read data with expected data to generate test results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional test devices are used to test different types of semiconductor memory devices, then comprehensive testing capability is achieved, but device complexity and development time increase significantly
Solution Approach 1:
The test device is designed with a universal interface that can test multiple types of semiconductor memory devices (DRAM, SRAM, Flash, PRAM, MRAM, RRAM, FRAM) through a single integrated architecture. The test control circuit and physical layer are configured to support various memory types without requiring separate test devices for each memory type, thereby achieving comprehensive testing capability while reducing device complexity.
Solution Approach 2:
The test device employs configurable parameters including test operation types (read, write, erase), memory cell ranges, and communication protocols that can be dynamically adjusted. The vector memory stores test data and control signals that can be modified to adapt to different memory device specifications, allowing the same physical hardware to accommodate various memory types by changing operational parameters rather than hardware configuration.
2Reliability
If comprehensive test conditions are set for each memory device type, then test coverage is improved, but development time and manufacturing effort increase
Solution Approach 1:
The vector memory pre-stores test data, control signals, and operation sequences before actual testing begins. This preliminary preparation allows the test device to quickly adapt to different memory device types without requiring time-consuming configuration during development. The test control circuit can directly access and execute pre-loaded test vectors, significantly reducing the time needed to set up comprehensive test conditions for various memory types.
Solution Approach 2:
The test device uses vector data representations that copy and store test operation sequences, control signals, and expected results in a standardized format. These vector representations can be replicated and reused across different memory device types, allowing comprehensive test coverage to be achieved through software/firmware configuration rather than hardware redesign, thereby reducing development time while maintaining thorough testing.
3Measurement precision
If specific test conditions are configured for each memory device, then testing accuracy is improved, but ease of manufacture and development deteriorates
Solution Approach 1:
The test device is divided into distinct functional modules: a test control circuit, a physical layer for communication, and a vector memory for data storage. Each module can be independently designed, manufactured, and configured. The test control circuit handles high-level control logic, the physical layer manages signal transmission, and the vector memory stores test parameters. This segmentation allows for easier manufacturing and development while maintaining the precision needed for accurate testing, as each module can be optimized independently.
Solution Approach 2:
The vector memory acts as an intermediary between the test control circuit and the external memory device under test. It stores and manages test data, control signals, and expected results in a standardized format, mediating the interaction between the test device and various memory device types. This intermediary layer abstracts the complexity of different memory specifications, allowing the test control circuit to maintain simple, unified control logic while achieving accurate testing across diverse memory types through the vector data intermediary.
Data Source
AI summary
A test device includes a vector memory configured to store a plurality of vector data, a test control circuit configured to test an external memory device by receiving a first vector data, transmitting a memory request, a memory address, and memory data included in the first vector data, and comparing read data from the external memory device with expected data, and a physical layer configured to communicate with the external memory device through data lines and a command/address line, output a command corresponding to the memory request and an address corresponding to the memory address through the command/address line, output write data corresponding to the memory data through the data lines, receive the memory request, the memory address, and the memory data from the test control circuit, and receive the read data from the external memory device through the data lines.