SN65DP159: SN65DP159(set in I2C mode) have no picture output to screen with 4K. but it is ok in FHD condition.

Bogey

Please check the source to make sure the source can support HDMI2.0.

Is this 4K@30Hz or 4K@60Hz?

Are you in GPIO or I2C mode? Please check TMDS_CLOCK_RATIO_STATUS and make sure the bit is read back as 0x1b.

Thanks
David

Hi David

Customer use the source is 4K@60Hz and we setting in I2C Mode.

And customer reference as below link. and want borrow USB tool tool to debug.
may we know what kind TI usb tool can support?
www.ti.com/.../sllu224b.pdf
Bogey

Bogey

The SW is available on TI.com: www.ti.com/.../toolssoftware.

Are you using the SM65DP159 in redriver or retimer mode at 4K2K60? Please check TMDS_CLOCK_RATIO_STATUS and make sure the bit is read back as 0x1b.

Also, when there is no video, do you have a scope capture of the output signal? I am wondering if the VOD and EQ of DP159 is being set correctly or not.

Please also send me the schematic and layout for review.

Thanks
David

Hi David

One more question

 

If hot plug /unplug 4k@30Hz or 4K@60Hz LCD Monitor or TV on 159, the SCDC code will send out by my source thru 159, its correct?

                                                 Bogey

Bogey

Correct, the standard requires sinks to clear the TMDS_CLOCK_RATIO_STATUS in the SCDC when either +5 V power signal from source is not present or when hot plug detect pin goes low for 100 ms or more.

When bit 1 of address 0xA8 offset 0x20 in the SCDC register set is written to a 1’b1, then TMDS_CLOCK_RATIO_STATUS will be set to a 1’b1. When bit 1 of address 0xA8 offset 0x20 is written to a 1’b0, then the field will be set to a 1’b0.

Thanks
David

Hi David

thanks for your reply, may we check with you TMDS181 also same behavior?
Bogey