Memory Clock Offset Control for Command Signal Alignment
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Solution Overview
Problem
Conventional methods for aligning clock and command/address signals in memory devices struggle to maintain adequate alignment as clock rates and data rates increase, particularly in memory modules operating at different speeds and data rates, and trace routing optimization is inadequate for optimizing signal alignment across a wide range of operating conditions.
Innovation Solution
Implementing a clock offset at each memory device corresponding to its current operating speed, using predetermined clock offset values stored in a mode register, to ensure improved alignment of clock and command/address signals, regardless of varying operating speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If trace routing optimization is used to align clock and command/address signals, then signal alignment is improved at specific operating conditions, but alignment deteriorates across varying operating speeds and data rates
Solution Approach 1:
The patent implements dynamic clock offset adjustment by introducing a clock offset circuit that can modify the clock signal phase based on detected operating conditions. The system dynamically selects from multiple predetermined offset values stored in a mode register, allowing the clock signal to adapt its timing relationship with command/address signals across different operating speeds and data rates, thereby maintaining alignment versatility.
Solution Approach 2:
The patent changes the timing parameter of the clock signal by introducing adjustable offset values. The mode register stores multiple predetermined offset values that correspond to different operating conditions. By selecting and applying appropriate offset values based on detected operating speed and data rate, the system adjusts the clock signal phase parameter to maintain proper alignment across varying conditions.
2Ease of manufacture
If conventional trace routing optimization is used, then manufacturing is simplified, but signal alignment precision deteriorates at high clock rates and data rates
Solution Approach 1:
The patent introduces a clock offset circuit as an intermediary component between the clock signal source and the memory device logic. This intermediary actively adjusts the clock signal timing by applying selected offset values, thereby compensating for alignment issues that cannot be resolved by trace routing alone. This adds precision adjustment capability without requiring complex trace routing modifications.
Solution Approach 2:
The system performs self-adjustment by detecting its own operating conditions (speed and data rate) and automatically selecting appropriate clock offset values from the mode register. This self-service mechanism maintains signal alignment without requiring external manual calibration or complex manufacturing processes, preserving ease of manufacture while improving alignment precision.
Data Source
AI summary
Methods, systems, and apparatuses for managing clock signals at a memory device are described. A memory device or other component of a memory module or electronic system may offset a received clock signal. For example, the memory device may receive a clock signal that has a nominal speed or frequency of operation for a system, and the memory device may adjust or offset the clock signal based on other operating factors, such as the speed or frequency of other signals, physical constraints, indications received from a host device, or the like. A clock offset value may be based on propagation of, for example, command/address signaling. In some examples, a memory module may include a registering clock driver (RCD), hub, or local controller that may manage or coordinate clock offsets among or between various memory devices on the module. Clock offset values may be programmed to a mode register or registers.