MIPI Specifications and Testing

Elevate Semiconductor, San Diego, California, Release: June 24, 2020. 

The mobile industry processor interface (MIPI®) standard defines industry specifications for the design of mobile devices such as smartphones, tablets, laptops and hybrid devices. MIPI interfaces play a strategic role in 5G mobile devices, connected car and Internet of Things (IoT) solutions. The MIPI standard defines three unique physical (PHY) layer specifications: MIPI D-PHY®, M-PHY® and C-PHY®. MIPI D-PHY and C-PHY physical layers support camera and display applications, while the high-performance camera, memory and chip-to-chip applications are supported on top of the M-PHY layer.

MIPI is managed by MIPI Alliance which is a collaboration of mobile industry leaders which include Intel, Nokia, Samsung, Motorola, TI, ST etc. The objective of MIPI Alliance is to promote open standards for interfaces to mobile application processors. This will help in having new services to mobile users at faster rate.

In the mobile market, MIPI Alliance specifications are targeted to mobile devices that operate on mobile networks. Typical devices are smartphones, tablets, laptops and hybrid devices. MIPI Alliance provides specifications that serve manufacturers’ various needs for physical layer, multimedia, chip-to-chip or interprocessor communications (IPC), control/data, debug/trace, and software integration applications.

All of the specifications are designed to address three characteristics essential to successful mobile designs: 1) low power to preserve battery life; 2) high-bandwidth to enable feature-rich, data-intensive applications, and 3) low electromagnetic interference (EMI) to minimize interference between radios and other subsystems in a device.

Smartphones

The smartphone industry is the largest single market for MIPI specifications. All major chip vendors use MIPI Alliance specifications and all smartphones on the market include at least one MIPI specification. MIPI specifications are used in hundreds of millions of smartphones.

MIPI Alliance specifications cover the full range of interface needs in a device. The specifications can be applied to integrate the modem, application processor, camera, display, audio, storage, antennas, tuner, power amplifier, filter, switch, battery, sensors, and other components.

Component vendors and device manufacturers use MIPI Alliance specifications because the technologies simplify designs, reduce design costs and shorten time-to-market for efficient, high-performing products. And fundamentally, each specification is optimized to ensure three performance characteristics needed in a mobile device: low power to preserve battery life, high-bandwidth to enable feature-rich applications, and low electromagnetic interference (EMI) to optimize performance of radios and subsystems.

Tablets, laptops and hybrid devices

Devices that converge mobile and computing capabilities are important markets for MIPI Alliance specifications. MIPI specifications helped establish and advance the tablet market and many organizations in the PC industry use MIPI specifications in mobile-connected laptops, tablet/laptop hybrids and other devices. Typical use cases for MIPI specifications in these devices include connecting and managing power consumption for high-definition displays and minimizing the number of wires deployed through hinges to connect cameras or displays.

 Specifications

MIPI specifications address only the interface technology, such as signaling characteristics and protocols; they do not standardize entire application processors or peripherals. Products which utilize MIPI specs will retain many differentiating features. By enabling products which share common MIPI interfaces, system integration is likely to be less burdensome than in the past.[8]

MIPI is agnostic to air interface or wireless telecommunication standards. Because MIPI specifications address only the interface requirements of application processor and peripherals, MIPI compliant products are applicable to all network technologies, including GSM, CDMA2000, WCDMA, PHS, TD-SCDMA, and others.

Some of the specifications by MIPI include:

  • Camera Serial InterfaceDisplay Serial Interface
  • Display pixel interface
  • System Power Management Interface (SPMI)
  • SoundWire, introduced in 2014[12]

MIPI CSI Interface

CSI stands for Camera Serial Interface. It specifies high speed serial interface between a host processor and camera module. Figure-2 depicts MIPI CSI-2 Interface.

Following are the features of MIPI CSI-2 Interface.

  • It is high performance serial interface between image sensor and application processor.
  • It uses D-PHY physical layer with upto 4 data lines which provides data throughput of about 4Gbps.
  • Separate I2C compliant interface used for camera control functions as shown.
  • MIPI CSI interface offers following benefits.
  • Scalability • Lower power • improved reliability • lower system cost

MIPI DSI Interface

 DSI stands for Display Serial Interface. It is High speed and high performance serial interface. The DSI interface offers efficient, low power and low pin count connectivity between application processor and display module (or display bridge IC). It uses MIPI D-PHY as physical layer. Following are the features of MIPI D-PHY.

  • It uses 4 data lines with 1 common differential line
  • Throughput upto 1Gbps can be achieved.
  • Both pixel and data commands are serialized into single physical stream between processor and display IC. The status is conveyed from display IC to application processor.

MIPI Testing

MIPI DESIGN AND SIMULATION

You need to design mobile devices that address the evolving data storage, data transfer, display, camera, memory, power, and other requirements defined by MIPI specifications. Customers demand higher performance, real time streaming of multimedia content and feature-rich applications.

MIPI TRANSMITTER TEST

You need to test the performance of your MIPI transmitter device to ensure it is not the root cause of signal impurities at the receiving end of the transmission line. MIPI D-PHY, M-PHY and C-PHY all have unique transmitter test challenges. With hundreds of tests to be performed, you can save significant test time by using automated compliance test software.

MIPI RECEIVER TEST

You need to test your MIPI receiver device to ensure it can properly detect the digital signal content of an input signal. It is important to test it against a worst-case stress condition to account for signal degradation in the transmission channel. You need an accurate high-speed signal stimulus, as well as bit error detection capabilities, to test the performance of your MIPI receiver. Automated compliance test software enables you to quickly test all key parameters of your designs.

MIPI PROTOCOL TEST

Protocol validation occurs predominately at the interface layer. There are many different protocols supported on the PHY layer of the MIPI specifications, including CSI-2, DSI-1, DigRF, CSI-3, UFS, UniPro, SSIC, and MPCIe. Each protocol has its own unique requirements and tests. For both MIPI D-PHY and M-PHY protocols, there is a stack between the physical and link layer, as well as between the transport and high-level application layer. To truly identify where an error exists, it is ideal to be able to “see into” that stack.

How MIPI Interfaces Enable 5G Smartphones

The first wave (phase 1) of high-end 5G smartphones is expected to be an enhancement of the high-end 4G devices currently on the market. Major enhancements will include the addition of the new 5G NR RF subsystem, and the evolution of other subsystems to enable better user experiences and richer multimedia capabilities. For example, these 5G smartphones may have three to four high-resolution rear cameras with high-frame-rate/slow-motion video capture capability, an enhanced microphone array, multi-channel audio and stereo speakers.

The 5G modem and application processor use MIPI specifications such as CSI-2 for cameras and DSI-2 for the display, as well as either the low-power, high-bandwidth, pin-efficient MIPI D-PHY or C-PHY physical layers. MIPI RFFE for RF front-end devices control, and MIPI UniPro with M-PHY for high-performance flash storage are all becoming ubiquitous in 5G designs. MIPI I3C, SoundWire, SLIMbus and upcoming VGI specifications are expected to be adopted in many upcoming 5G smartphone platforms as well.

MIPI CSI-2

MIPI CSI-2 is the most widely used camera interface in mobile and other markets. It has achieved widespread adoption for its ease of use and ability to support a broad range of high-performance applications, including 1080p, 4K, 8K and beyond video, and high-resolution photography.

Designers should feel comfortable using MIPI CSI-2 for any single- or multi-camera implementation in mobile devices. The interface can also be used to interconnect cameras in head-mounted virtual reality devices; automotive smart-car applications for infotainment, safety, or gesture-based controls; imaging applications for client content creation and consumption products; camera drones; IoT appliances; wearables; and 3D facial recognition security or surveillance systems.

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