== 时钟 sensor clock

sensor的输入时钟 MCLK

输出时钟：
1. VTPixelClock：会影响sensor内部的帧率、曝光

VTPixelClock(vt_clk)Video Timing Clock, From sensor PLL

VTPixelClock = Framelengthlines x LinelengthPixelClock x FPS

Framelengthlines LinelengthPixelClock 对应sensor的内部寄存器

2. OutputPixelClock：给mipi传输使用的，影响sensor传输的速率

OutputPixelClock = DataratePerLane x Lane number / BitWidth
DataratePerLane：每条lane的速率

Example:

1920x1080_30fps_10bit_4lane_1.6992Gbps

OutputPixelClock = 1.6992Gbps x 4 / 10 = 679680000

MIPI Clock = DataratePerLane / 2 = 1.6992Gbps / 2 = 849.6Mbps
::为什么除以二，因为mipi是双采样

== Sensor 帧率

FPS(Framerate): Sensor每秒输出多少帧图像

FPS = VTPixelClock/frameLengthLines/lineLengthPixelClock

VTPixelClock(vt_clk):Video Timing Clock, From sensor PLL

frameLengthLines(vts):对应sensor实际寄存器值，height + VBlank

lineLengthPixelClock(hts):对应sensor实际寄存器值, width + HBlank

== Sensor 曝光

LineReadoutTime：sensor是行曝光，即一行数据读完的时间

LineReadoutTime = LinelengthPixelClock / VTPixelClock

ExposureTime: Sensor 曝光时间
LineCount = ExposureTime / LineReadoutTime

LineCount <= FramelengthLines – Offset(4, 6, 8)