UFS Hibernate Exit Timing Using Reference Clock Monitoring
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Solution Overview
Problem
Current UFS devices experience delays in exiting the hibernate state due to reliance on squelch detection, which prolongs the time required to respond to host requests for data bursts.
Innovation Solution
The method involves monitoring the reference clock signal to initiate the exit from hibernation state without waiting for squelch detection, allowing the device to power up components earlier and reduce the hibernation exit time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device waits for squelch detection to exit hibernation state, then the device can ensure stable signal detection, but the hibernation exit time is prolonged
Solution Approach 1:
The device performs preliminary actions by detecting the reference clock signal activation and initiating the exit from hibernation state before squelch detection is complete. The controller starts the T-Activate timer and begins activating data storage device blocks as soon as the reference clock is detected, rather than waiting for squelch detection to finish, thereby reducing overall exit time while maintaining signal stability through the established activation sequence.
2Measurement precision
If the device uses squelch detection to monitor hibernation exit request, then the device can accurately detect the exit request, but the device complexity increases
Solution Approach 1:
The invention extracts and eliminates the squelch detection logic from the hibernation exit monitoring process. Instead of using squelch detection to monitor for exit requests, the device now relies on the reference clock signal activation as the trigger for exiting hibernation state. This removal of the squelch detection component simplifies the device architecture while maintaining accurate detection of exit requests through the reference clock signal.
3Stability of the object's composition
If the device activates data storage device blocks after squelch detection, then the device can ensure proper signal stabilization, but the activation time is increased
Solution Approach 1:
The device performs preliminary activation of data storage device blocks by initiating the T-Activate timer immediately upon detecting reference clock signal activation, before squelch detection completes. This preliminary action allows the blocks to start activating earlier in the process, reducing the overall activation time while the signal stabilization is maintained through the controlled activation sequence defined by the T-Activate timer duration.
Data Source
AI summary
Rather than waiting on a squelch to detect the difference in the state from steady to floating, this disclosure suggests using the time from when a reference clock is turned on to begin the process to exit the hibernation state. The reference clock is turned off while a data storage device is in the hibernation state to save power. Once the host is ready for the device to exit the hibernation state, the reference clock is turned on. The reference clock is monitored for the change. Once the reference clock is on, the data storage device returns to a steady state. In the ready state, the data storage device has a shortened ready time. Once the ready time is complete, the data storage device may now exit the hibernation state without waiting on squelch detection or a hibernation exit request from the host.