Control Signal Generation Circuit for Nonvolatile Memory Timing
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Solution Overview
Problem
In highly integrated 3D semiconductor memory devices, timing mismatches between signal transmission lines due to line loading can negatively affect the operation of the memory device, particularly in nonvolatile memory devices where signal control is critical for data retention and access.
Innovation Solution
A control signal generation circuit that activates and deactivates control signals through two steps, using a counting unit to generate timing information and adjust the activation or deactivation points of control signals, thereby minimizing timing mismatches and optimizing signal transmission in nonvolatile memory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cells are reduced in size to increase data storage capacity, then storage density is improved, but timing mismatch between signals increases due to increased line loading
Solution Approach 1:
The control signal is activated in advance (pre-charged) to a first level before the actual write operation begins. This preliminary action ensures that the control signal is ready and stable before data writing starts, compensating for the timing delays caused by increased line loading in high-density memory configurations.
Solution Approach 2:
The control signal activation is divided into two dynamic stages: a first level activation that occurs before data writing, and a second level activation that occurs during data writing. This dynamic, multi-level approach allows the system to adapt to varying timing requirements and maintain signal integrity despite increased line loading from higher memory density.
2Device complexity
If control signal activation timing is fixed, then circuit simplicity is maintained, but timing mismatch between control signals and data signals increases
Solution Approach 1:
The control signal activation process is segmented into two distinct timing phases: a first activation level that occurs before data writing, and a second activation level that occurs during data writing. This segmentation allows each phase to be optimized independently for its specific timing requirements while maintaining overall system reliability.
Solution Approach 2:
The first level of control signal activation is performed as a preliminary action before the actual data writing operation. This advance activation ensures that the control signal is established early, providing a timing margin that compensates for line loading delays without requiring complex real-time adjustment mechanisms.
Data Source
AI summary
A control signal generation circuit may include: a counting unit suitable for generating counting information; a first signal generation unit suitable for activating/deactivating a first signal based on the counting information, first rising information, and first falling information; a second signal generation unit suitable for activating/deactivating a second signal based on the counting information, second rising information, second falling information, and the first falling information; and a control signal driving unit suitable for driving a control signal in response to the first and second signals.