SN65DP159: SN65DP159 no HDMI output

Dane Zhang

Part Number: SN65DP159

Hi team,

our customer is using SNX5DP159(48pin) to achieve DP to HDMI. now AUX_SRCP/AUX_SRCN input has signal while SCL_SNK/SDA_SNK has no signal output. could you kindly help on this?

The debugging situation is as follows:

1. Hardware: input via AUX

2. Software: Initialize DP159 through I2C:

(void)dp159_write(client, 0x09, 0x02);

(void)dp159_write(client, 0x0B, 0x01);

(void)dp159_write(client, 0x0C, 0xA0);

(void)dp159_write(client, 0x0D, 0x00);

(void)dp159_write(client, 0x0A, 0x3d);

3. Register: read register value

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru**** 177676 points

Hi,

Are they doing DP to HDMI or DP++ to HDMI? The DP159 can only support DP++ to HDMI. For DP to HDMI, you would need an active protocol converter.

Thanks

David

0 alex wang3 over 4 years ago in reply to David (ASIC) Liu

Prodigy 10 points

DP++ to HDMI,it only need set AUX_BRG_EN to 1？Is there any other configuration？

AUX_BRG_EN: this field enable the AUX bridge working.This is only valid for the 48-pin

package.

0 – AUX bridge disable

1 – AUX bridge enable (default)

0 David (ASIC) Liu over 4 years ago in reply to alex wang3

TI__Guru**** 177676 points

Hi,

AUX bridge enable bit is the only bit needs to be set to 1.

Does the source support I2C-over-AUX?

Are you AC-coupling the AUX on the input side and having 2k pullup on the SDA_SNK and SCL_SNK?

Thanks

David

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SN65DP159: SN65DP159 no HDMI output