topic i.MX RT1050 parallel RGB LCD H-res / dot clock rating in i.MX RT Crossover MCUs

i.MX RT1050 parallel RGB LCD H-res / dot clock rating

Bugger — Wed, 09 Jan 2019 08:16:36 GMT

What is the maximum dot clock / what is the maximum RGB dots per HSYNC that can be supported ? (DPI interface)

Wanting to use 1280 pixel horizontal in RGB666

Re: i.MX RT1050 parallel RGB LCD H-res / dot clock rating

weidong_sun — Thu, 10 Jan 2019 05:20:32 GMT

Hi,

>>What is the maximum dot clock ?

The LCD_DOTCLK is max 75MHz, see LCDIF_CLK_ROOT in Reference Manual, please!

>>what is the maximum RGB dots per HSYNC that can be supported ?

HSYNC is determined by dotclock, resolution & Frames per second.

>>Wanting to use 1280 pixel horizontal in RGB666

LCDIF on i.MXRT1050 supprts WXGA(1280x800), which is max resolution, you can calculate dot clock according to requirments, assume 60fps & 50fps & 30fps:

-- dot clock = 1280x800 * 60 * 130% =79.872MHz. > 75MHz

dot clock = 1280x800 * 50 * 130% =51.2MHz. < 75MHz

dot clock = 1280x800 * 30 * 130% =39.936MHz. < 75MHz

[ 30% is reserved for "blank" ]

Taking 30fps an example:

-- display data (Byte) = 1280x800 *3*30 = 92.16MB/s

If external SDRAM can work at 166MHz, the resolution should be OK.

So you can evaluate it according to your requirments.

Have a nice day!

Weidong Sun

Re: i.MX RT1050 parallel RGB LCD H-res / dot clock rating

giannigrondona — Thu, 17 Jan 2019 11:01:45 GMT

How can I set LCD PANEL CLOCK ? I use an MXRT 1050 microprocessor. I need to know which registers I have to set.

Thank you

Best Regards

Giovanni Grondona