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MIPI CSI-2 specification v1.3

19.02.2015

Industry organization MIPI Alliance has released a new version of the Camera Serial Interface (CSI) specification. The CSI-2 v1.3 specification adds the ability to work over one of two physical layer interfaces: D-PHY or C-PHY.

Previously, CSI-2 used the D-PHY physical layer interface. The C-PHY v1.0 physical layer interface specification was adopted by the MIPI Alliance last September. CSI-2-enabled products can use either physical layer interface or both.

The MIPI C-PHY interface uses three-phase character encoding and transmission over three-wire lines ("trios"). The synchronization signal is integrated into the data so that the transmission of one symbol corresponds to the transmission of approximately 2,28 bits. Compared to D-PHY, longer link lengths and higher speeds are possible. The throughput of MIPI CSI-2 v1.3 with C-PHY reaches 22,7 Gb / s over four lines or 2,5 billion symbols per second. This allows you to increase the resolution, color depth, frame rate with pin compatibility with MIPI D-PHY. As a result, all popular video formats, including 4K at 30 fps and 12 bits per pixel color depth, can be transmitted over a single MIPI C-PHY line.

For comparison: in the case of CSI-2 D-PHY v1.2, the peak throughput is 2,5 Gb / s on one line or 10 Gb / s on four. Two lines are required to transmit 4K video at 30 fps and 12-bit color depth.

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