Hi all
I'm using i.MX6DualLite and have two questions.
Q1:
According to RM, I can calculate in the following way.
In my case, my board will receive 1080p@60fps and its data format is RGB444.
When calculated according to the formula, the required frequency is almost 240MHz.
F = 1920 * 1080 * 60 * 1.35 * 1.5 = 251,942,400Hz ⇒ 240MHz
I couldn't understand whether if i.MX6 can support the frequency.
Is this frequency would be required in each lane ?
If yes, i.MX6DualLite could not support 1080p60 and its data format is RGB444.
Is it correct ?
Q2:
According to Page 2791 of RM, it can be supported as it looks.
Does the description mean that the max frequency is 125MHz at each lane ?
I think the two description is different each other.
Which one is correct ?
Ko-hey
Solved! Go to Solution.
The considerations of the first item (Q1) relate to parallel interface,
strictly speaking, they are not suitable for serial MIPI CSI-2.
As for the serial MIPI, for 1, 2 or 3 lanes maximum throughput is 1000 Mbps/lane,
assuming 125 Mbyte/sec. For 4 lanes - 800Mbps/lane
Have a great day,
Yuri.
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Hi Yuri
I understood it isn't suitable for MIPI CSI-2.
So how can I judge the data is supported ?
Is there any formula for judge it ?
As for MIPI speed, I'm planning to use two lanes.
If I use two lanes, the maximum throughput is 2000 Mbps, assuming 125 MByte/s.
In my undesstanding, I can calculate the required througput from following way.
The required throughput = Frame height * Frame width * Frame rate * Blanking intervals * The amount of data per pixel
So when I use 1080p@60fps in RGB444, I need 480 MByte/s.
1920 * 1080 * 60 * 1.35 * 24 = 3,844 Mbit/s ⇒ 480 MByte/s
From the above results, MIPI CSI-2 I/F cannot support 1080p@60fps in RGB444.
Is it correct ?
Ko-hey
Hello,
please refer to app note AN5305 "MIPI–CSI2 Peripheral on i.MX6 MPUs".
http://cache.nxp.com/files/32bit/doc/app_note/AN5305.pdf
Regards,
Yuri.
Hi Yuri
Thank you.
I'll check it.
Ko-hey