5.7.5 Functional Description

As shown in the following figure, the CSI2DC is connected to a CSI-2 protocol host side. The host side receives data from a CSI-2-compliant camera. The supported host protocol, Image Data Interface (IDI), uses a 32-bit data bus, vertical and horizontal timing accurate video synchronization signals, data type and virtual channel.

The CSI2DC receives a packet-based data stream, and outputs a pixel stream through its video pipeline connected to the Image Sensor Controller.

When a packet is received, a snoop controller can be used to monitor CSI-2 traffic and identify that the desired information is successfully transmitted and received in the CSI2DC.

Once configured, the video pipe filters packets and transmits a predefined image data type. Only relevant packets are forwarded to the ISC clock domain. A buffer is used to adjust clock domain crossing between the CSI-2 host domain and the ISC clock domain. The video pipe must be enabled to route data from the camera to the ISC.

A system bus client port is also available to retrieve non-image data that are locally saved into buffers. The dual buffer operation can be used with centralized DMA assistance or by using CPU accesses. A simple queue is used to pass data packets from the CSI-2 host clock domain to the system bus clock domain. The packet is routed based on its data type.The data pipe must be enabled to route data from the camera to the system bus client interface.