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Saving Power in a UFS Implementation Leveraging MIPI M-PHY and UniPro

The JEDEC Universal Flash Storage (UFS) has become the mobile storage standard of choice for today’s high-end smartphones and tablets mainly due to the specification’s performance and power advantages over other existing solutions. These advantages become critical to meet end users’ requirements for higher responsiveness and increased capabilities. For example, end users expect to transmit and receive high-resolution photos and videos in seconds amid the high volume of files and other operations.

UFS is designed to help overcome this challenge as it uses the MIPI M-PHY specification for its physical interconnect layer and MIPI UniPro specification for its data transmission (or link) layer. To save additional power, the JEDEC UFS standard leverages reference clock gating in low-speed (LS-MODE) and hibernate (hibern8) modes. This white paper describes how UFS leverages MIPI M-PHY and UniPro specifications to save power by determining the safest time to gate the reference clock in a UFS implementation.

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