Does FPD Link protocol allows Camera and Serializer to be 4-lane and Deserializer to be 2-lane?

Prasad Pallapu

Hello TI team,

I am trying to interface a 4-lane Camera through TI Serializer DS90UB953 and Deserializer DS90UB954 to a TI Board DRA71x based. This camera module is off the shelf and I am trying to configure it to 2-lane(since DRA71x supports only 2-lane MIPI CSI2). But meanwhile, I wanted to check if there is a possibility and FPD Link protocol allows Camera and Serializer to be 4-lane and Deserializer to be 2-lane(may be configure the Deserializer to 1.2 Gbps or 800Mbps, if say the Serializer/Camera is 800Mbps speed?) and still receive the data. Do you see the possibility of such a configuration? Of course I will make sure that Sensor resolution and fps is within 1.6Gbps. Just asking this question on the assumption that Camera MIPI lane configuration change is not in my hand, whereas resolution and fps of Camera is in my hand. Please let me know if you need any more clarifications

over 4 years ago

0 Jiashow Ho over 4 years ago

TI__Genius 11340 points

Hi Prasad,

Yes, as long as the deserializer output speed is high enough to output at 2-lane.

Serializer reg 0x02 configures the input lane number, and deserializer reg 0x33 configures the output lane number.

Best,

Jiashow

0 Prasad Pallapu over 4 years ago in reply to Jiashow Ho

Intellectual 510 points

Hello Jiashow,

Thanks for the rely.

In your response you said, "high enough to output at 2-lane"

"high enough" in terms of sensor frame data or high enough to meet the 4-lane and it's per lane speed ?

0 Steven(Shenzhen) Shi over 4 years ago in reply to Prasad Pallapu

TI__Mastermind 30515 points

Pallapu,

do you use one 953 camera input?

the "high enough to output at 2-lane" means the 954 total CSI2 output bandwidth should be >=953's total CSI2 input bandwidth.

regards,

Steven

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Does FPD Link protocol allows Camera and Serializer to be 4-lane and Deserializer to be 2-lane?