mipi protocol part 2

In the MIPI CSI-2 ecosystem, the CCI (Camera Control Interface) is an I²C-compatible protocol used by the host processor (master) to configure and control the camera sensor (slave) through register read and write transactions. CCI supports 4 types of read transactions and 2 types of write transactions to efficiently access sensor registers and multi-byte configuration data. The four read transactions are: (1) Single Read from Random Location, where the master first writes the target register address (sub-address), issues a repeated START, and then reads one byte from that location; (2) Sequential Read from Random Location, where the master first provides a starting register address and then reads multiple consecutive bytes sequentially while the internal register pointer auto-increments; (3) Single Read from Current Location, where the slave returns one byte from the current internal register pointer without needing a sub-address write; and (4) Sequential Read from Current Location, where multiple bytes are read continuously from the current register pointer location with automatic address incrementing. The two write transactions are: (1) Single Write to Random Location, where the master sends the slave address, register index, and a single data byte to update one register; and (2) Sequential Write Starting from Random Location, where multiple data bytes are written continuously starting from a specified register address, allowing configuration of multi-byte registers or consecutive registers efficiently. During multi-byte transactions, data is generally transferred MSB first and LSB last, with ACK/NACK handshaking after every byte. For large registers such as 16-bit, 32-bit, or 64-bit sensor configuration registers, internal buffering mechanisms ensure atomic updates and coherent reads so that partial writes or concurrent internal updates do not corrupt the register contents. These CCI transaction types provide flexible, reliable, and bandwidth-efficient communication between the CSI-2 receiver and the camera sensor for initialization, exposure control, gain programming, frame configuration, and other imaging operations.

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