GMSL2 Dual CSI-2 Serializer with GMSL1 Compatibility

The MAX9295D converts single- or dual-port MIPI CSI-2 data streams to GMSL2™ or GMSL1™ while sending and receiving control-channel data, enabling full-duplex single-wire transmission of forward video and bidirectional control data over cables in excess of 15m in length. In GMSL2 mode, the device operates at a fixed rate of 3Gbps or 6Gbps in the forward direction and 187.5Mbps in the reverse direction. In GMSL1 mode, the MAX9295D can be paired with first-generation 3.12Gbps or 1.5Gbps GMSL1 deserializers or operate up to 4.5Gbps with GMSL2 deserializers configured for GMSL1 mode. Operation is specified over the automotive temperature range of -40°C to +105°C and the device is AEC-Q100 Grade 2 qualified. Cable can be coaxial or shielded twisted pair (STP).

Table 1. Typical Maximum Cable Length vs. Attenuation

3.2mm Ø 50Ω Coax, Foam Dielectric

2.7mm Ø 50Ω Coax, Solid Dielectric

100Ω Shielded-Twisted Pair, AWG26

Attenuation at 3GHz (Typ, Room Temp)

0.9dB/m

1.6dB/m

1.8dB/m

Attenuation at 3GHz (Max, Aged, +105°C)

1.1dB/m

2.0dB/m

2.2dB/m

GMSL Fwd/Rev Data Rate

Typical Maximum Cable Length at +105°C

3Gbps/187.5Mbps

20m

10m

11m

6Gbps/187.5Mbps

15m

9m

8m

Applications

* Co-located sensors

* Stereo camera

* Side mirror

* Radar

* Lidar

* Dual 4-Lane MIPI CSI-2 v1.3 Ports

* MIPI D-PHY v1.2 at 80Mbps

* 2.5Gbps per Lane

* 4-Channel CSI-2 Virtual-Channel Support

* Support for RAW8/10/12/14/16/20, RGB565/666/888 and YUV8-/10-Bit Data types

* CSI-2 Inputs in GMSL2 Mode Accept Cameras with Different Video Timing and Resolution

* CSI-2 ECC and Checksum Error Detection and Flagging

* CSI-2 Lane Reassignment and Polarity Flip

* Selectable GMSL2 at 3/6Gbps or Backward-Compatible GMSL1 Mode

* Operates up to 4.5Gbps with GMSL2 Deserializers in GMSL1 Mode

* 187.5Mbps Reverse Link for Reduced-Size Power-over-Cable (PoC) Filter

* Forward- and Reverse-Channel PRBS for BER Testing of Serial Link

* Reverse-Channel Eye-Opening Monitor for Continuous Link-Margin Diagnosis

* Reverse-Channel Adaptive Equalization Allows Coax Cable Longer than 15m with Multiple Inline Connectors

* Crosspoint Switch Remaps Input to Any Desired Deserializer Output Order

* ASIL-Relevant Functional Safety Features (GMSL2)

* ASIL-B Compliant

* 16-Bit CRC Protection of Side-Channel Data (I2C, UART, SPI, GPIO) with Retransmission upon Error Detection

* Optional 32-Bit CRC Protection of Video-Line Data

* Video Watermark Insertion and Detection