Semiconductor Memory Control Signal Synchronization
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Solution Overview
Problem
In semiconductor memory devices, particularly DRAM, the synchronization between the multiplexing unit and sense amplifiers, as well as the latch unit, is mismatched due to different source signals controlling these units, leading to timing discrepancies and waveform differences in data transmission.
Innovation Solution
A semiconductor memory device is designed with a control signal generating unit that synchronizes the column select signal with the column address signal, ensuring that the multiplexing unit and latch unit operate in sync, using both signals to control data transfer and prevent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different source signals are used to control the multiplexing unit and sense amplifiers, then the data transmission path can be simplified, but synchronization mismatch and timing discrepancies occur between units
Solution Approach 1:
A synchronization signal generating unit is introduced as an intermediary component that receives the column select signal and generates a synchronized column address signal. This mediator ensures that both the multiplexing unit and sense amplifiers operate based on the same timing reference, eliminating synchronization mismatch while maintaining a simplified control structure.
Solution Approach 2:
The control functions for the multiplexing unit and sense amplifiers are merged into a unified synchronization system. By deriving both control signals from the same column select signal through the synchronization signal generating unit, the patent combines previously separate control paths into a single coherent timing reference system.
2Adaptability or versatility
If the multiplexing unit and latch unit operate with different timing signals, then independent control is achieved, but waveform distortions and timing errors occur in data transmission
Solution Approach 1:
The synchronization signal generating unit acts as a mediator that preserves control independence while ensuring timing coherence. It takes the column select signal and distributes synchronized timing information to both the multiplexing unit and latch unit, allowing them to operate independently yet in perfect synchronization.
Solution Approach 2:
The synchronization signal is generated in advance from the column select signal before being distributed to control the multiplexing and latching operations. This preliminary generation of the synchronized timing signal ensures that both units are pre-coordinated to operate with identical timing references, preventing waveform distortions.
3Reliability
If additional control signals are introduced to synchronize units, then synchronization reliability improves, but device complexity increases
Solution Approach 1:
The synchronization signal generating unit performs multiple functions: it receives the column select signal, generates the synchronized column address signal, and distributes timing information to multiple units. This multi-functional approach achieves reliable synchronization without requiring separate dedicated control circuits for each unit.
Solution Approach 2:
The patent changes the timing parameter of the control signals by deriving them from a common source. Instead of using independent timing parameters for each unit, the synchronization signal generating unit transforms the column select signal into a unified timing reference that coordinates all operations, reducing complexity while improving reliability.
Data Source
AI summary
A semiconductor memory device includes data transmission devices for transmit data in synchronization with each other. The semiconductor memory device includes a plurality of data transferring unit, a first control unit, a multiplexing unit, and a second control unit. The plurality of data transferring unit transfers data to a plurality of global lines. The first control unit controls the plurality of data transferring unit in response to a column select signal to select a column of a memory cell. The multiplexing unit multiplexes the data transferred to the plurality of global lines. The second control unit controls the multiplexing unit, wherein the second control unit synchronizes the column select signal with a column address signal having a column address information of the memory cell.