The PHY Working Group is chartered to specify high-speed physical layer designs to support multiple application requirements. The first specification developed by the PHY WG was targeted primarily to support the requirements of camera and display applications. The resulting standard, D-PHY, is a low-power, differential signaling solution with a dedicated clock lane and one or more (scalable) data lanes. To support longer term requirements for more advanced applications, the PHY WG has released and continues to develop a higher speed, embedded clock design called M-PHY® that supports several industry specifications, developed by MIPI as well as other partner organizations.
Click here for more information on UniPort-M. — www.mipi.org/mphyunipro
The physical layer, or PHY, is the heart of any advanced, serial interconnect standard. Very different peripherals often share similar requirements at the PHY level. Recognizing this, MIPI® developed a single D-PHY specification as a re-usable physical layer solution upon which MIPI camera interfaces, display panel interfaces, and general-purpose high-speed/low-power interfaces could be based. This helped streamline the development of multiple standards in MIPI, but also benefits the companies implementing these interfaces in semiconductor products, since much of the PHY engineering investment can be re-used on subsequent designs.
MIPI D-PHY delivers up to 1.5 Gbps per lane via an advanced source-synchronous, differential SLVS design which is scalable to the number of lanes required by the application. It meets the demanding requirements of low-power, low-noise-generation, and high-noise immunity which mobile phone designs demand.
The PHY Working Group has successfully launched M-PHY v3.0, the next step in the multiple high-speed GEAR roadmap, with bandwidth speeds reaching ~5.8 Gigabits per second per lane. The group continues its work on M-PHY to increase high speed bandwidth.
MIPI M-PHY is a high-frequency, low-power physical layer defined by MIPI Alliance Specification for M-PHYSM. The M-PHY can be used as a physical layer for many applications, including interfaces for display, camera, audio, video, memory and storage, power management and communication between Baseband and RFIC. By using efficient BURST mode operation with scalable speeds, significant power savings can be obtained. Selection of signal slew rate and amplitude allows reduction of EMI/RFI, while maintaining low bit error rates.
It currently supports or will support the following MIPI Specifications: DigRF v4, CSI-3, UniPro, and LLI. By special agreement with JEDEC, JC-64.1 Universal Flash Storage (UFS) will use UniPort-M, the combination of the M-PHY physical layer and MIPI UniPro Specifications. On June 20th, 2012, MIPI and the USB 3.0 Promoter Group announced the availability of the SuperSpeed Inter-Chip (SSIC) specification. SSIC utilizes the MIPI M-PHY physical layer with the SuperSpeed USB protocol and software layers to achieve high speeds and low power.
Please refer to the evolution graph for more information about the status.
Ken Drottar, Intel
Andrew Baldman, UNH-IOL
Henrik Icking, Intel Corporation
Raj Kumar Nagpal, STMicroelectronics