Command Signal Delay Adjustment for Memory Timing Synchronization
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Solution Overview
Problem
In semiconductor memory, accurate timing of internal command and clock signals is crucial for proper operation, but high-frequency memory clock signals and multi-data rate memories complicate synchronization, leading to potential misinterpretation or incorrect data transfer if timing is not precisely managed.
Innovation Solution
A control circuit with a clock path and command path that includes a timing circuit and a delay-locked loop (DLL) circuit, which adjusts delays in clock and command signals to ensure synchronization, using latency values to synchronize internal clock and command signals with external clock signals, thereby maintaining proper timing for read and write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If memory clock signals operate at high frequencies (1 GHz or higher), then productivity increases, but timing synchronization between command signals and clock signals becomes more difficult to maintain
Solution Approach 1:
The patent implements dynamic delay adjustment mechanisms where delay values for command signals are continuously adapted based on detected timing relationships between clock signals and command signals. The system dynamically modifies delay parameters to maintain synchronization as operating conditions change, allowing the memory system to operate accurately at high frequencies without fixed timing constraints.
Solution Approach 2:
The patent employs feedback mechanisms where the timing relationship between clock signals and command signals is continuously detected and measured. This feedback information is then used to adjust delay values in subsequent operations, creating a closed-loop control system that maintains precise timing synchronization even at high clock frequencies where traditional fixed-timing approaches fail.
2Productivity
If multi-data rate memories output data at rates higher than clock frequency, then productivity increases, but timing synchronization between command signals and internal clock signals becomes more complex
Solution Approach 1:
The patent implements dynamic delay adjustment mechanisms where delay values for command signals are continuously adapted based on detected timing relationships between clock signals and command signals. The system dynamically modifies delay parameters to maintain synchronization as operating conditions change, allowing the memory system to operate accurately at high frequencies without fixed timing constraints.
Solution Approach 2:
The patent applies preliminary delay adjustments to command signals based on predicted timing requirements for multi-data rate operations. By pre-adjusting delay values before data output operations occur, the system prepares the timing synchronization in advance, reducing the complexity of real-time coordination when operating at data rates higher than the clock frequency.
3Adaptability or versatility
If latency values are adjusted to accommodate different clock frequencies, then adaptability increases, but device complexity increases due to additional timing control mechanisms
Solution Approach 1:
The patent implements adjustable delay parameters that can be modified based on the detected clock frequency and timing relationships. By changing delay parameters dynamically rather than requiring separate hardware paths for different frequencies, the system achieves broad adaptability while minimizing the increase in device complexity. The delay values are adjusted as control parameters rather than requiring structural changes.
Solution Approach 2:
The patent designs a universal timing control mechanism that handles multiple clock frequencies and data rates through a single integrated delay adjustment system. This multi-functional approach allows the same hardware structure to adapt to various operating conditions, reducing overall device complexity compared to having separate dedicated circuits for each frequency or mode.
Data Source
AI summary
Apparatuses and methods related to adjusting a delay of a command signal path are disclosed. An example apparatus includes: a timing circuit that includes a divider circuit that receives a first clock signal having a first frequency and provides a complementary pair of second and third clock signals having a second frequency that is half the first frequency; a first delay circuit that receives the second clock signal and provides a delayed second clock signal responsive to the second clock signal; and a second delay circuit that receives the third clock signal and provides a delayed third clock signal responsive to the third clock signal. The timing circuit receives a first signal, latches the first signal responsive to the delayed second clock signal to provide a second signal and latches the second signal responsive to either the second clock signal or the third clock signal responsive to latency information.