Response Completion Pacing With Ready Queue Latency Control
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Solution Overview
Problem
Memory devices face challenges in maintaining efficient performance and reducing latency due to varying access times and bus traffic loads, leading to degraded signal quality and increased noise, which affect quality of service measures.
Innovation Solution
Implementing response completion pacing through a ready response queue with a cadence period and logic timer to control the timing of output communications, adjusting the storage capacity and number of responses in the queue to maintain targeted latency and quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If memory devices operate at higher speeds to meet market demand, then productivity is improved, but signal quality degrades and noise increases
Solution Approach 1:
The patent implements periodic action by using a cadence period to pace the output of completion responses from the memory device. The logic timer generates periodic signals that control when responses are sent to the host device, creating a regular rhythm of data transmission. This periodic pacing stabilizes signal transitions and reduces noise by preventing erratic or overly frequent response outputs, thereby resolving the contradiction between high operating speed and signal quality degradation.
2Productivity
If memory devices operate at higher speeds, then productivity is improved, but reliability decreases due to increased noise and degraded signal quality
Solution Approach 1:
The patent implements feedback by monitoring the cadence period and logic timer status to dynamically control the pacing of completion responses. The system uses feedback from the timer expiration events and queue depth to regulate the output rate, ensuring that responses are sent at optimal intervals. This feedback mechanism maintains reliable performance by adjusting the response pacing based on actual system conditions, preventing signal degradation and noise issues even at high operating speeds.
3Reliability
If response completion pacing is implemented with a ready response queue and cadence period, then reliability is improved through predictable output timing, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the ready response queue with a predetermined target depth and establishing the cadence period before actual data transmission begins. The logic timer is pre-set with the cadence period value, and the queue is prepared to hold the target number of completion responses. This preliminary setup simplifies the overall device complexity by establishing fixed parameters in advance, reducing the need for complex real-time decision-making logic during operation.
Data Source
AI summary
Methods, apparatuses and systems related to response completion pacing for latency control are described. The apparatus may utilize response completion pacing to dynamically control timing of output communications to the host. In some embodiments, the memory device can include a ready response queue that temporarily stores the data retrieved from a backend portion or a storage portion of the memory device. The apparatus can include logic coupled to the ready response queue and configured to communicate/send the data in the ready response queue according to a cadence period. In some embodiments, the logic can further dynamically adjust a storage capacity of the ready response queue and/or the cadence period.