4 Overview of CSI-2

The CSI-2 Specification defines standard data transmission and control interfaces between transmitter and receiver. Two high-speed serial data transmission interface options are defined.
The first option, referred to in this specification as the “D-PHY physical layer option,” is a unidirectional differential interface with one 2-wire clock Lane and one or more 2-wire data Lanes. The physical layer of this interface is defined by the MIPI Alliance Specification for D-PHY [MIPI01]. Figure 1 illustrates the connections for this option between a CSI-2 transmitter and receiver, which typically are a camera module and a receiver module, part of the mobile phone engine.
CSI-2规范定义了transmitter 和receiver之间的标准数据传输和控制接口。定义了两个高速串行数据传输接口选项。
第一种选择，在本规范中称为“D-PHY physical layer option”，是一个单向差分接口，具有一个2线时钟Lane和一个或多个2线数据Lane。该接口的物理层由MIPI D-PHY联盟规范[MIPI01]定义。图1说明了该选项在CSI-2 transmitter 和 receiver之间的连接，它们通常是相机模块和接收器模块，是手机引擎的一部分。

The second high-speed data transmission interface option, referred to in this specification as the “C-PHY physical layer option,” consists of one or more unidirectional 3-wire serial data Lanes, each of which has its own embedded clock. The physical layer of this interface is defined by the MIPI Alliance Specification for C-PHY [MIPI02]. Figure 2 illustrates the CSI transmitter and receiver connections for this option.
第二个高速数据传输接口选项，在本规范中称为“C-PHY physical layer option”，由一个或多个单向3线串行数据通道组成，每个通道都有自己的嵌入式时钟。该接口的物理层由MIPI联盟规范C-PHY [MIPI02]定义。图2说明了该选项的CSI发射器和接收器连接。

The Camera Control Interface (CCI) for both physical layer options is a bi-directional control interface compatible with the I2C standard [NXP01].
两个物理层(c-phy/D-phy)选项的CCI (Camera Control Interface)是一个双向控制接口，兼容I2C标准[NXP01]。