Semiconductor Memory Initialization via Pre-Charge Voltage Control
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Solution Overview
Problem
Semiconductor devices require efficient initialization operations to set initial conditions for normal operation, but existing methods lack effective mechanisms for driving pre-charge voltages to memory cells to store data correctly, especially in scenarios involving multiple word lines and bit lines.
Innovation Solution
A semiconductor device comprising a power supply circuit, a word line control circuit, and a memory circuit that generates and applies pre-charge voltages to bit lines based on a write initialization signal, allowing sequential selection of word lines and storage of data into memory cells, enabling correct initialization and data storage across multiple memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an initialization operation is performed to set initial conditions for memory cells, then correct logic levels are established for normal operation, but the device requires complex control mechanisms to manage multiple word lines and bit lines sequentially
Solution Approach 1:
The patent applies preliminary action by pre-charging all bit lines to a predetermined voltage level before the actual data writing operation begins. The initialization operation sequentially selects each word line and pre-charges its associated bit lines in advance, ensuring that when data is written, the memory cells are already in the correct initial state. This preliminary pre-charging action eliminates the need for complex real-time control during data writing.
Solution Approach 2:
The initialization operation is segmented into discrete sequential steps, with each word line being selected and initialized independently through dedicated control signals. The word line control circuit generates individual selection signals for each word line, allowing the system to break down the complex initialization task into manageable, systematic segments that can be processed in order.
2Manufacturing precision
If pre-charge voltages are driven to memory cells during initialization, then data storage accuracy is improved, but the initialization operation time increases due to sequential processing of multiple word lines
Solution Approach 1:
The patent maintains continuity of useful action by overlapping the pre-charge operation with the initialization sequence. While one word line is being pre-charged, the control circuit is already preparing the next word line selection, ensuring that the initialization process flows continuously without idle gaps. The sequential selection of word lines combined with continuous pre-charging operations maximizes efficiency while maintaining accuracy.
Solution Approach 2:
By performing the pre-charge action preliminarily during the initialization phase rather than during actual data operations, the system ensures data storage accuracy is established upfront. This preliminary pre-charging of bit lines to specific voltage levels guarantees that subsequent data writes occur under optimal conditions, improving storage accuracy without requiring re-operations.
3Reliability
If sequential word line selection is used during initialization, then all memory cells can be initialized systematically, but the initialization speed is reduced compared to parallel operations
Solution Approach 1:
The memory array is segmented by word lines, with each word line being systematically selected and initialized in sequence. The word line control circuit divides the initialization task into discrete segments corresponding to individual word lines, ensuring that every memory cell is covered without omission. This segmentation approach guarantees initialization completeness while maintaining systematic control.
Solution Approach 2:
The initialization operation employs periodic action through repetitive cycles of word line selection and pre-charging. Each word line undergoes the same initialization sequence in a periodic manner, creating a rhythmic, systematic process that ensures all memory cells are initialized uniformly. This periodic repetition of the selection and pre-charge cycle guarantees completeness across the entire memory array.
Data Source
AI summary
A semiconductor device may include a power supply circuit, a word line control circuit, and a memory circuit. The power supply circuit may drive a pre-charge voltage to a level of an external voltage based on a write initialization signal which is enabled if a command has a predetermined level combination. The word line control circuit may generates two or more word line selection signals that are sequentially counted based on the write initialization signal. The memory circuit may sequentially select a plurality of word lines based on the word line selection signals. The memory circuit may drive bit lines of memory cells connected to the selected word line to the pre-charge voltage. The memory circuit may store data, which are loaded on the bit lines to have a level of the pre-charge voltage, into the memory cells connected to the selected word line.