Semiconductor Memory Device Operation Mode Determination
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Solution Overview
Problem
Conventional semiconductor memory device manufacturing processes lack efficiency in determining operation modes, as they typically differentiate between x4 and x8 organizations only during packaging, leading to separate testing and assembly steps, which can be inefficient and not aligned with modern manufacturing trends where memory devices are produced as modules.
Innovation Solution
A semiconductor memory device and method that utilize an MRS signal and data pin signals to determine operation modes, allowing for simultaneous testing and assembly of x4 and x8 configurations, enabling common manufacturing processes and flexible module assembly by connecting data pins to power or ground voltages based on specific signal combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If operation mode determination is performed during packaging process, then manufacturing efficiency is improved, but device complexity increases due to additional control circuits
Solution Approach 1:
The semiconductor memory device determines its own operation mode automatically by detecting the connection state of data pins during module assembly, eliminating the need for external mode setting equipment or complex control circuits. The device self-configures based on physical pin connections, improving manufacturing efficiency while maintaining simple circuitry.
Solution Approach 2:
The operation mode is determined during module assembly before final product completion, allowing subsequent manufacturing steps to be optimized for the specific mode. This preliminary determination enables efficient production planning and reduces rework, achieving high productivity without adding complexity to the memory device itself.
2Manufacturing precision
If separate testing and assembly steps are used for x4 and x8 organizations, then manufacturing precision is maintained, but productivity decreases due to process fragmentation
Solution Approach 1:
A single module assembly process can accommodate both x4 and x8 organization devices by using the data pin connection states to automatically determine the operation mode. This universal approach eliminates the need for separate testing and assembly lines for different organizations, maintaining precision through accurate pin-state detection while significantly improving productivity through process consolidation.
3Stability of the object's composition
If data pins are connected to power or ground voltages for mode determination, then operation mode switching stability is improved, but noise susceptibility increases
Solution Approach 1:
The operation mode determining circuit continuously monitors the data pin connection states and uses feedback to confirm the detected mode. By verifying the connection state multiple times and comparing against expected patterns, the circuit can distinguish valid mode indications from noise, achieving stable mode switching while rejecting interference.
Solution Approach 2:
The determining circuit is designed with noise filtering and validation logic that anticipates potential interference. By preparing threshold comparisons and validation checks before mode switching occurs, the system cushions against noise effects, ensuring that transient interference does not cause erroneous mode changes while maintaining stable operation.
Data Source
AI summary
A semiconductor memory device capable of determining an operation mode by using states of data pins, and an operation mode determining method for the same are disclosed. The semiconductor memory device includes at least one MRS input pad, at least one data input pad, and an operation mode determining circuit. The operation mode determining circuit generates an operation mode determining signal, when an MRS command input through the MRS input pad corresponds to a predetermined MRS command and data signals input through the data input pad or pads include a predetermined combination. Accordingly, the efficiency in the manufacturing and producing processes may be improved by determining the operation mode of the semiconductor memory device in a module assembly process.