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i.MX6DQ CSI performance.

Question asked by Keita Nagashima on Apr 2, 2014
Latest reply on Apr 3, 2014 by Yuri Muhin

Hi.

 

I'd like to know the CSI performance.

Is it possible to input dual 1080p@60 video into CSI?

I think it is impossible.

 

Because, there is below limitation.

F = FH * FW * FPS * BI * DF

Where

   FH = frame height (in pixels)

   FW = Frame width (in pixels)

   fps = frame rate (frames per second) ? BI = typically 35% overhead, should be assumed as 1.35. The actual blanking intervals are a parameter of the attached device.

   DF = data format, defines the number of cycles needed to send a single pixel.

 

If one use a 1080p@60 camera;

167.96MHz = 1080 * 1920 * 60 * 1.35 * 1 < 240MHz --> OK

In case of Dual camera;

335.92MHz = 1080 * 1920 * 60 * 1.35 * 1 * 2 > 240MHz --> NG


If one use a 1080p@60 and a 720p@60 camera;

242.6MHz = (1080 * 1920 * 60 * 1.35 * 1) + (1280 * 720 *60 *1.35 * 1) > 240MHz --> NG


Is my understanding right?


Keita


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