TMDS181: Can you disable the video stream?

JLA

Intellectual 2545 points

Part Number: TMDS181

Tool/software:

Hello,

Is it possible to disable a video stream by choice?

Can you use power down mode to disable a present video stream?

If you can disable it, how do you recommend to do it?

Many thanks

Jorgen

over 1 year ago

0 Drew Miller1 over 1 year ago

TI__Mastermind 37213 points

Hi Jorgen,

We're looking into this and will get back to you shortly.

Thanks,

Drew

0 David (ASIC) Liu over 1 year ago in reply to Drew Miller1

TI__Guru**** 179636 points

Jorgen

Refer to Table 12 in the TMDS181 datasheet, any condition that would put the output into High-Z would disable the video stream, is this what you are looking for?

Thanks

David

0 JLA over 1 year ago in reply to David (ASIC) Liu

TI__Intellectual 2545 points

Hi David,

Yes it is and I think you don that via this register?

If not can you guide me to how to do it using I2C?

Thanks

Jorgen

+1 David (ASIC) Liu over 1 year ago in reply to JLA

TI__Guru**** 179636 points

Jorgen

Your understanding is correct, this is done through the I2C write.

Please note that when the TMDS181 is put into a power-down state, the I2C registers are cleared. This is important as the TMDS_CLOCK_RATIO_STATUS bit will be cleared. If cleared and HDMI2.0 resolutions are to be supported, the TMDS181 expects the source to write a 1 to this bit location. If this does not happen, the PLL will not be set properly and no video may be evident.

Thanks

David

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TMDS181: Can you disable the video stream?