TFP401: Unable to get proper output on TFP401 and SN65LVDS93A

YONGSIK PARK

Prodigy 30 points

Part Number: TFP401
Other Parts Discussed in Thread: SN65LVDS93, SN65LVDS93A

I've designed a board which convert HDMI signals to LVDS interface where we used TFP401AIPZPRQ1 and SN65LVDS93ADGGR.

I'm able to see the output on TFT Display for the required resolution but something wrong with it.

I attached datasheet of Display, picture, clip and schematic.

Desktop uses Ubuntu 18 HDS-K01_REV1_HDMI2LVDS.pdf [LCD_7_1024x600]ZW-T070BAHA-52.pdf.04.

Here is the picture of the ouput.

over 4 years ago

0 Ikechukwu Anyiam over 4 years ago

TI__Mastermind 35130 points

Hi Yongsik,

You have the TFP401 and SN65LVDS93 latching data on opposite clock edges. Please try connecting the OCK_INV pin on the TFP401 high.

Regards,

I.K.

0 YONGSIK PARK over 4 years ago in reply to Ikechukwu Anyiam

Prodigy 30 points

YES.

I already tested it.

DFO = L

nPD = H

nPDO = H

ST = H

PIXS = L

nSTAG = H

OCK_INV = H

Are there any points to test?

0 Ikechukwu Anyiam over 4 years ago in reply to YONGSIK PARK

TI__Mastermind 35130 points

Hi Yongsik,

Have you checked and ensured that your HDMI stream does not contain any audio in it? Also, what resolution is this panel?

Regards,

I.K.

0 user6319423 over 4 years ago in reply to Ikechukwu Anyiam

Prodigy 10 points

Hi.

I checked that.

No audio signal is contained HDMI stream.

And, The resolution is 1024 x 600.

Additionally, I've tested EDID(except extension) already. But, It works same.

I attached EDID setting.

thank you.

0 YONGSIK PARK over 4 years ago in reply to user6319423

Prodigy 30 points

'user6319423' is my collegue.

We are using Deltacast E-EDID Editor for debugging.

0 Ikechukwu Anyiam over 4 years ago in reply to YONGSIK PARK

TI__Mastermind 35130 points

Can you take a look at the output clock, VSYNC, and HSYNC from the TFP401 on an oscilloscope? Is there anything amiss with these signals or do they look stable? What about the output LVDS clock of the SN65LVDS93A?

Regards,

I.K.

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TFP401: Unable to get proper output on TFP401 and SN65LVDS93A