Mipi protocol in RFFE

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MIPI Official website

https://www.mipi.org

MIPI union

Mobile industry processor interface （Mobile Industry Processor Interface abbreviation MIPI） union .

MIPI （Mobile Industry Processor Interface） Agreement is MIPI union （MIPI Alliance） A communication protocol for standardizing the communication between devices of mobile terminal system is proposed .2003 year ,ARM,Nokia,ST( Italian French semiconductor ),TI( Texas Instruments ) Four companies formed an alliance , be called MIPI union . The purpose of this alliance is to integrate the internal interfaces of mobile phones, such as cameras 、 Display interface 、 radio frequency / Baseband interface standardization , So as to reduce the complexity of mobile phone design and increase design flexibility .

After years of development , end 2019 year 12 month ,MIPI The alliance has released 48 Standards , The application field is also extended to automobile 、 Industry and AR/VR Other fields .MIPI The alliance owns, including terminal manufacturers 、 Device manufacturer 、 Platform manufacturers and test manufacturers 339 A member unit .MIPI The protocol has become the mainstream standard protocol for the communication of devices in mobile terminals .

MIPI Not a single interface or protocol , It contains a set of protocols and standards , To meet the requirements of each subsystem （ Image subsystem [ Cameras and monitors ]、 Storage subsystem 、 Wireless subsystem 、 Power management subsystem 、 Low bandwidth subsystem [ Audio 、 keyboard 、 mouse 、 bluetooth ]） Unique requirements .

MIPI RFFE（MIPI RF Front-end,MIPI RF front end ） yes MIPI union RFFE The working group is in 2010 Control interface standard for RF front-end control of mobile terminals launched in . stay MIPI RFFE Prior to the launch , The control solution of RF front-end is complex , If you use parallel GPIO Mouth control , Too many interfaces are required , The system cost cannot be carried .2010 year ,MIPI The alliance has launched a system for RF front-end control MIPI RFFE agreement .MIPI RFFE The protocol bus consists of a power cord （VIO） And two control lines （SCLK and SDATA） constitute , Implement a simple , Easy to deploy , It can realize near real-time control within the time sequence range .

in the past 10 For many years , Wireless terminal communication protocol from 3G Evolved to 4G、5G,MIPI The agreement is also evolving . at present ,MIPI The agreement has evolved to V3.0 edition , Support for multiple Trigger Pattern , To adapt to 5G More devices and more stringent timing control requirements in communication system .

MIPI RFFE System architecture

As shown below MIPI RFFE System architecture ：

One MIPI RFFE Your architecture usually includes ：

• Signal Bus： contain SCLK and SDATA Two signal lines
• RFFE Master Device： Control system MIPI signal bus The device , Generally, it refers to the... In the mobile phone system RFIC（transceiver）, Single MIPI The system can support up to 4 individual Master device
• BOM：Bus Own Master, There can only be one... At any one time BOM To be activated
• RFFE Slave Device：MIPI Controlled devices , Generally RF front-end module , for example PA、LNA、Switch etc. , Single MIPI The system can support up to 15 individual device

One Slave The device has three states , Respectively Active、Shutdown and Startup.

• VIO control MIPI Does the system Shutdown
• When VIO=high when ,MIPI Get into Startup state , Then automatically enter active state

MIPI RFFE Of ID To configure

MIPI RFFE There are many definitions of ID,ID As MIPI in Slave Device identification code plays a very important role .

MIPI RFFE Contains relevant ID And the corresponding register address 、 The explanation is as follows ：

• MID（Manufacturer ID）： Every manufacturer is joining MIPI Alliance After that, they will be assigned a special MID, From the official website （https://mid.mipi.org/） Query to
• PID（Product ID）： It is managed by the manufacturer to configure different products PID, stay MIPI RFFE V2.1 Introduced Extend-PID, such PID It includes 16bits For configuration
• USID（Unique Slave ID）：MIPI bus Mainly through USID Yes Slave Device addressing ,USID common 4bits 16 Group status , But a MIPI bus It's the most 15 individual Slave device ,MIPI RFFE Definition SID=0b0000 When it is broadcast ID, namely BSID（Broadcast Slave ID）

MID and PID The corresponding registers are read-only, and USID There is usually a default value , At the same time, it can support programmable . as a result of MIPI The order is based on USID Addressing , When one MIPI bus All the Slave The device has two or more USID At the same time , It will make it impossible to distinguish , So programmable USID crucial .

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