Pixel_clk_hz calc issue

[550399056]

    Using PLL multiplier and PLL pre/post dividers:

    MCLK multiplier = PLL multiplier / PLL pre-divider / PLL post-divider

    pixel_clk_hz = MCLK × MCLK multiplier

    For example:

        MCLK = 24MHz

        PLL multiplier = 30

        PLL pre-divider = 3

        PLL post-divider = 3

    Then:

        MCLK multiplier = 30 / 3 / 3 = 6.67

        pixel_clk_hz = 24000000 × 6.67 = 160000000

    Using sensor CSI lane output rate:

    pixel_clk_hz = sensor data rate per lane (Mbps) * number of lanes / bits per pixel

    For example:

        Sensor data rate = 891 Mbps (per lane)

        Number of lanes = 4

        Bits per pixel = 10

    Then pixel_clk_hz = 891 Mbps × 4 / 10 = 356400000

    Using frame size and frame rate

    pixel_clk_hz = sensor output size × frame rate

The above is the method for calculating pix frequency. I have a few questions:

1. pixel_clk_hz = sensor data rate per lane (Mbps) * number of lanes / bits per pixel
   

   Does the sensor data rate per lane represent the speed of the channel?
   Depending on the version, the maximum speed of the standard CSI lane channel is 1.5Gbps or 2.5Gbps/lane.

   Where can I obtain the sensor data rate per lane (Mbps) value if I want to calculate pixel_clk_hz?

    Sensor output size = 2200 × 1125

    (actual output size 1920 × 1080)

    Frame rate = 30 frames/second

    pixel_clk_hz = 2200 × 1125 × 30 = 74250000

My camera resolution is 960 * 960 now, how should I confirm the sensor output size of the camera？

[ShaneCCC]

Check below doc.

https://docs.nvidia.com/jetson/archives/r35.1/DeveloperGuide/text/SD/CameraDevelopment/SensorSoftwareDriverProgramming.html?highlight=pix_clk_hz#sensor-pixel-clock

[550399056]

The above is the content in the doc. Can you reply to my question? thank you

[ShaneCCC]

If you want to know exactly the sensor output clock you need to check the sensor data sheet. Each sensor may have different calculation.

Thanks