Latency Offset for Frame-Based Memory Communications
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In frame-based communications, the misalignment between the read return clock (RCK) and the frame clock in memory devices leads to data contention on bidirectional buses, affecting communication reliability between host devices and memory devices, especially when high data rates are required.
Innovation Solution
Determining and applying a latency offset to the write latency, corresponding to an integer quantity of clock periods, to align data transmission and avoid bus contention, which can be stored in a mode register and determined during initialization and training procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame-based communications are used to achieve high data rates, then productivity is improved, but data contention on bidirectional buses occurs due to clock misalignment
Solution Approach 1:
The patent applies parameter changes by adjusting the write latency parameter to include a latency offset that compensates for the clock misalignment between RCK and frame clock. This offset is determined during training procedures and stored in mode registers, allowing the system to maintain high data rates while eliminating bus contention through precise timing parameter adjustment.
2Productivity
If read latency and write latency are optimized for speed, then productivity is improved, but bus contention occurs due to misaligned timing
Solution Approach 1:
The patent implements preliminary action by determining the latency offset during initialization and training procedures before normal data transfer begins. The offset is calculated based on the specific hardware configuration and stored in mode registers, so that when high-speed data transfer starts, the timing alignment is already established and bus contention is prevented.
3Reliability
If clock alignment is implemented to avoid bus contention, then reliability is improved, but device complexity increases due to additional latency offset determination
Solution Approach 1:
The patent uses feedback mechanisms where the latency offset is determined during training procedures by monitoring and analyzing the timing relationship between RCK and frame clock. The determined offset is then stored in mode registers and applied automatically during normal operation, creating a closed-loop system that ensures reliable timing without requiring complex real-time adjustment mechanisms.
Data Source
AI summary
Methods, systems, and devices for latency offset for frame-based communications are described. A memory system may include a host device and a memory device that communicate using frames based on a frame period of a frame clock. The memory device may receive a read command and a write command from the host device, and determine a read latency and a write latency corresponding to the received commands. The memory device may also determine an additional offset latency to add to the write latency to avoid bus contention between read data and write data associated with the read command and the write command, respectively. The offset latency may correspond to an integer quantity of clock periods, which may be less than the frame period.