Getting the best out of available battery technologies continues to be a challenge for mobile design companies. When phones were used for voice only, the battery lasted a few days compared to less than a day in case of smartphones with high resolution screens, cameras, powerful processors, gigabytes of memories and running power hungry software. Consumers continuously demand more features and functions from their mobile electronics and with more functions converged into a single device, it’s becoming extremely challenging for SoC designs to keep up with the exploding bandwidth, advanced integration functionality and low power constraints.
MIPI Alliance has been leading the effort in designing energy efficient interfaces with low and ultra-low power features as cornerstones of its specifications. One of the primary focus in all of the MIPI specifications is to lower power consumption and making the interfaces energy efficient. This blog reviews M-PHY and D-PHY specifications for their energy efficient features.
MIPI M-PHY  is a serial interface technology with high bandwidth capabilities used for mobile applications requiring low pin count and demanding power efficiency. The MIPI M-PHY Specification features the following aspects for energy efficiency:
MIPI D-PHY is a flexible, low-cost, High-Speed serial interface solution for communication interconnection between components inside a mobile device. Traditionally, these interfaces are CMOS parallel busses at low bit rates with slow edges for EMI reasons. The MIPI D-PHY solution enables significant extension of the interface bandwidth for more advanced applications. The MIPI D-PHY solution can be realized with very low power consumption.
Operating Modes: Control, High-Speed, and Escape
During normal operation a Data Lane will be either in Control or High-Speed mode. High-Speed Data transmission happens in bursts.
Protocols such as Camera Serial Interface, Display Serial Interface, UniPro and Low Latency Interface utilize these and their own features to help create energy efficient designs. We will cover some of these protocols in the upcoming blogs.
Synopsys provides a complete set of MIPI VIP; more details can be found at http://synopsys.com/vip
Authored by Apoorva Mathur.
 MIPI Alliance Specification for M-PHY, Version 4.0, 27 April 2015
 MIPI Alliance Specification for D-PHY, Version 2.0, 23 November 2015