SN75DP159: DP to HDMI Output not coming

Nihar Ranjan

Part Number: SN75DP159

Please find attached our carrier board schematics.

We are converting DP out of MXM Module to HDMI.

The HDMI output is not coming from U76.

Urgent help is requested.

8 months ago

0 Zach Dryer 8 months ago

TI__Genius 13290 points

Hello, Nihar,

By looking at your schematic it looks like you are using DP input and not DP++ input into the SN75DP159.

The SN75DP159 is a DP++ to HDMI 2.0 retimer and not a DP to HDMI active protocol converter.

DP++ uses HDMI protocol encoding or TMDS and therefore the SN75DP159 is an passive protocol converter.

Thanks,

Zach

0 Nihar Ranjan 7 months ago in reply to Zach Dryer

Prodigy 70 points

Hello Mr Zach,

If "Figure 32. SNx5DP159 in Dongle Application", pg44 of Datasheet will work for us??

Thanks,

Nihar

0 Zach Dryer 7 months ago in reply to Nihar Ranjan

TI__Genius 13290 points

Hello, Nihar,

You will need an active protocol converter to take the DP signal and convert it into TMDS signaling into the input of DP159.

Thanks,

Zach

0 Nihar Ranjan 7 months ago in reply to Zach Dryer

Prodigy 70 points

Hello Mr Zach,

I checked with our graphics module provider, the interface is DP++.

We are not getting any transactions on SDA_SRC, SCL_SRC. They are always high.

Please let us know.

Thanks,

Nihar

0 Zach Dryer 7 months ago in reply to Nihar Ranjan

TI__Genius 13290 points

Hello, Nihar,

Also, the I2C over AUX functionality is only available in the RGZ package. For the RSB package, the AUX lanes should not be connected to the DP159RSB.

Is the R1699 resistor installed or is the R1695? If you would like I2C enabled you will need only the pull up resistor.

Does the GPU in this application support clock stretching?

Please refer to Figure 31. Implementation for Motherboard 2 of the datasheet for an illustration of an example schematic.

Thanks,

Zach

0 Zach Dryer 7 months ago in reply to Zach Dryer

TI__Genius 13290 points

Hello, Nihar,

If you have any further questions please let us know.

Thanks,

Zach

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SN75DP159: DP to HDMI Output not coming