Memory Power-Down Using Hardware Reset Signal Detection
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Solution Overview
Problem
Existing memory devices face issues with dirty power downs due to the inability of host devices to provide timely software notifications for powering off, leading to incomplete memory operations and subsequent bootup delays.
Innovation Solution
Implementing a hardware reset signal mechanism that allows memory devices to detect a predefined threshold in the reset signal, enabling them to complete ongoing operations before power down, thus ensuring a clean shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software notification is used to notify memory device of upcoming power down, then memory device can complete operations cleanly, but host device may not provide timely notification leading to dirty power down
Solution Approach 1:
The patent introduces a hardware reset signal as an intermediary mechanism between the host device and memory device. This hardware signal serves as a mediator that can reliably convey power down intent without depending on software notification timing, thus resolving the contradiction between achieving clean power down and avoiding bootup delays.
Solution Approach 2:
The patent replaces the software-based notification mechanism with a hardware-based reset signal mechanism. This substitution transitions from a software-controlled system to a hardware-controlled system, ensuring more reliable and timely communication of power down intent, thereby preventing dirty power downs and subsequent bootup delays.
2Reliability
If hardware reset signal is monitored to detect power down intent, then memory device can complete operations in time, but requires additional signal monitoring capability
Solution Approach 1:
The patent makes the hardware reset signal serve multiple functions: its traditional function of initiating a reset operation and a new function of notifying the memory device of upcoming power down. This multi-functionality allows the memory device to detect power down intent using existing hardware infrastructure, avoiding the need for entirely new monitoring capabilities while improving operation completion reliability.
3Reliability
If memory device waits for software notification before powering down, then operations can be completed cleanly, but system performance decreases due to waiting time
Solution Approach 1:
The patent enables the memory device to take preliminary action by detecting the hardware reset signal that indicates upcoming power down. Upon detecting this signal, the memory device proactively completes pending operations and prepares for shutdown in advance, ensuring data integrity while minimizing waiting time and maintaining system performance.
Data Source
AI summary
In some implementations, a memory device may receive, from a host device, a hardware reset signal. The memory device may determine that a level associated with the hardware reset signal satisfies a threshold for a period of time. The memory device may determine, based on the hardware reset signal satisfying the threshold for the period of time, that the host device is expected to power down the memory device. The memory device may complete an ongoing memory operation within a remaining time period based on the determination that the host device is expected to power down the memory device.