TFP401A-Q1: is it support 1080p on the odd pixel output?

Hi Henry,

Can you specify what you mean by "odd pixel output"? This device uses both even and odd pixels to support 1080p:

Best,

Shane

Hi Sir,

You mean if I use the one port output(odd or even), it cannot support 1080p, is it right?

Hi Sir,

Could I know the resolution TFP401A-Q1 support when using only one channel?

Hi Michael,

If you only use the odd output the vertical dimension would remain at 1080p, however you would only render every other vertical line on the screen. This would take the standard 1920x1080 resolution down to 960x1080.

Best,

Shane

Hi Sir,

Is it because PIXS is set to High, but I only use 1channel?

If we set PIXS to LOW,the best resolution should be 1400x1050.

Hi Michael,

PIXS is not the reason this is limited, it is limited to 960x1080 because you are using only one of the two RGB channels.

MICHAEL Lee said:

If we set PIXS to LOW,the best resolution should be 1400x1050.

This is not the case. The resource you've shown states that 1400x1050 can be supported by one channel of LVDS, not one even/odd output of RGB. The TFP401A converts an LVDS signal (like DVI) into an RGB signal with even and odd pixel outputs. If you are only using the odd output, this would bottleneck any resolution from the DVI receiver to 960x1080.

Best,

Shane

Hi Sir,

Is there any way I can do DVI to RGB888(1080p) or DVI to LVDS(1080P)?

Hi Michael,

I want to correct my past response about using the even-only output. You can do DVI to RGB888 using both even and odd pixel outputs or by using the even output only. You cannot only use the odd output or this will give you the 960x1080 resolution.

If you are using the even output only, then you need to set PIXS to low. This will cause both even and odd pixels to come from the even pixel output. The full 1080p resolution can be supported in this mode.

For DVI to LVDS I recommend following this resource. I believe this is what you had shown earlier.

I hope this helps, let me know if you have any questions.

Best,

Shane

Hi Sir,

Thanks for your help.

But I can find discription about the TFP401A 1-channel can support 1080p.

Can you help about this?

Hi Michael,

From the perspective of the TFP401A, 1080p resolution is possible with the 165MHz clock rate. The app note you're looking at is a system level overview that takes into account both the TFP401A and the LVDS TX. It's likely that the LVDS TX options presented do not support the full 1080p resolution on one LVDS channel given that the clock frequency caps out at 135MHz (for 93A-Q1).

It may be possible to support 1080p through the LVDS TX shown by reducing the refresh rate, but as I do not support these parts I'm not entirely sure. I recommend submitting an E2E ticket for the LVDS TX part you plan to use for better support on this. I can also refer this thread to that team if you'd like.

Best,

Shane