Nonvolatile Memory Write Interruption and Resumption
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Solution Overview
Problem
Existing nonvolatile semiconductor memory devices face inefficiencies in interrupting and resuming write operations due to the need to wait for completion of write operations, which can lead to data destruction and reduced read throughput when read operations are initiated during writing.
Innovation Solution
A memory system with a controller that issues interrupt and resumption commands, allowing the write operation to be paused and resumed from the point of interruption, using a register to hold write data and voltage, enabling read operations without waiting for write completion and maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the write operation is interrupted and a read operation is performed, then the read throughput is improved, but the write data may be destroyed and the write operation cannot be resumed from the interruption point
Solution Approach 1:
The patent applies preliminary action by saving the write data and write voltage to the sense amplifier before the write operation is interrupted. This ensures that when the write operation is resumed, the data and voltage information are already prepared and preserved, allowing the write operation to continue from the exact interruption point without data loss or need to restart.
2Productivity
If the write operation is interrupted to perform read operations, then the system efficiency is improved, but the write operation must wait for completion which reduces overall throughput
Solution Approach 1:
The sense amplifier saves the write data and write voltage in advance before interruption occurs. This preliminary saving action eliminates the need to wait for write completion when resuming, as all necessary data is already preserved. The write operation can be immediately resumed from the interruption point, significantly reducing wait time and improving overall system throughput.
3Speed
If the write operation is interrupted, then the read operation can proceed immediately, but the write voltage and data are lost without proper holding mechanism
Solution Approach 1:
The sense amplifier serves as an intermediary storage mechanism that captures and holds both the write data and write voltage when the write operation is interrupted. This intermediary function ensures that no information is lost during the interruption, as the sense amplifier temporarily stores all necessary write parameters, allowing for accurate resumption of the write operation.
Data Source
AI summary
A semiconductor memory device includes a memory cell array, a sense amplifier, a register, a controller. The memory cell array includes a memory cell. The sense amplifier connects to the bit line. The register holds write data, and a write voltage. The controller outputs a busy signal. The controller causes the register to hold the write data and the write voltage upon receiving the first command, and resumes the write operation based on the write data and the write voltage held in the register upon receiving the resumption command.