topic i.MX6DQ CSI performance. in i.MX Processors

i.MX6DQ CSI performance.

keitanagashima — Thu, 03 Apr 2014 05:09:34 GMT

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

Re: i.MX6DQ CSI performance.

Yuri — Thu, 03 Apr 2014 08:02:27 GMT

Correct for single IPU.

Have a great day,
Yuri

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Re: i.MX6DQ CSI performance.

keitanagashima — Thu, 03 Apr 2014 08:24:19 GMT

Dear Yuri,

Hello.

Thank you for your reply.

>Correct for single IPU.

If one use i.MX6DQ (= 2 IPUs), is it possible to input dual 1080p@60 video?

IPU0 <-- YUV422 1080p@60

IPU1 <-- YUV422 1080p@60

Keita

Re: i.MX6DQ CSI performance.

Yuri — Thu, 03 Apr 2014 10:21:44 GMT

Yes.