DS90C387 1 channel LVDS?

Greetings,

In single pixel mode, A0-A3 plus CLK1 are used. So you should be able to operate the device in single pixel out(using A0 through A3). Please note in this case, the maximum pixel clock is limited to 112MHz.

Regards,,nasser

Could you please help me to interface the TFP403 with DS90C387 on 1-LVDS channel with my screen www.display-solution.com/.../TCG121WXLPxPNN-ANx01_Pre%20.pdf ? I want to made a converter HDMI to 1 LVDS output (8 bits).

Thank you.

Hi Ouael,

Please reference the following posts for ideas about interfacing the TFP403 to the DS90C387. The TFP403 is similar to the TFP401A, with some slight pin-out differences (e2e.ti.com/.../112614).

There has been a recent example of successful interfacing between the TFP401A and the DS90C387 that you can reference as well when you work on your TFP403-to-DS90C387 design: e2e.ti.com/.../615666

Thanks,

Michael

Is this right for 1 channel LVDS (8 bits ) between TFP403 and DS90C387? :

Hi Ouael,

These connections look reasonable if you also observe the following (referenced from www.ti.com/.../slla325a.pdf):

1. Take note of your panel requirements and and the parallel pin mapping. It looks like in your schematic above, the first pixel is defined as even. Please check to see if this is true.

2. The mapping you have shown places the 2 LSBs of RGB data on LVDS pair A3. Check to make sure this is also acceptable by your panel requirements.

3. Since you are operating in single-pixel mode, ensure that DUAL pin on DS90C387A is tied low.

4. Set the same clock edge for both devices. For example, if OCK_INV is high on the TFP403, then R_FB on the DS90C387A should also be high.

Thanks,

Michael

Thank you . But you told :The mapping you have shown places the 2 LSBs of RGB data on LVDS pair A3. Check to make sure this is also acceptable by your panel requirements.

Why is not 2 MSBs ?

Thank you .

But you told : The mapping you have shown places the 2 LSBs of RGB data on LVDS pair A3. Check to make sure this is also acceptable by your panel requirements.

Are you sure about 2LSBs on A3 ? Is not 2 MSBs  with my configuration?

My configuration is like this, right ?

Here is DS90C387A mapping :

Here is my screen mapping :

As you can see on ma last configuration between TFP403 and DS90C387A, my configuration is right for my screen ( 2MSBs on A3) on 1 channel?

Could you please answer my question I need it very quickly.

Best regards.

Hi Ouael,

My mistake. When I was looking at the mapping, I was looking at the typical mapping for VGA - TFT data signals, which is what the DS90C387A is commonly used for. In that case, LSBs are placed on Channel A3 to facilitate changes between 24 bpp and 18 bpp resolution. Thank you for checking back with me.

The way that the TFP403 transmits the LVCMOS outputs to the DS90C387A for that app note I showed (SLLA325A) shows that the 2 MSBs come out on Channel A for the panel, and this matches what you showed with your panel. So, I believe your configuration is correct.

Thanks,

Michael