HD3SS214: Monitor blinks after switching

Hai Van Phu

Part Number: HD3SS214

Hi,

I am implementing a project using HD3SS214. I use this chip to switch between 2 monitors.
The schematic is shown below:

I have finished making the PCB board. I'm testing it, but I meet a problem.
First, after turn on the OE pin of HD3SS214, I change Dx_SEL pins to the mode "C to A", the desktop is shown on monitor 1, but after I switch to the mode "C to B", the monitor 2 blinks in 15 seconds before being stable.
Then I change to monitor 1 again, the monitor 1 now also blinking.
I have tested many times, the monitor always blinks before being stable except for the first time after turn the power on.
I wonder that problem caused by our design or that is usual.

Thanks and best regards,
Hai

over 6 years ago

0 David (ASIC) Liu over 6 years ago

TI__Guru**** 177966 points

Hai

Each monitor would require DP link training when switching from one monitor to another monitor, so I am expecting part of the blinking is due to link training. And once link training is completed, the video will become stable. The duration of link training will depend on the source, the sink, and quality of the main link.

Thanks
David

0 Hai Van Phu over 6 years ago in reply to David (ASIC) Liu

Prodigy 165 points

Hi David, Thank you for your reply! I think so! But is there any way to demonstrate this caused by link training or not? I worry the customers will doubt our product quality! Best regards, Hai

0 David (ASIC) Liu over 6 years ago in reply to Hai Van Phu

TI__Guru**** 177966 points

Hai

Do you have a AUX monitor tool? You need the AUX monitor tool to capture the link training sequence between the source and the monitor.

Thanks
David

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HD3SS214: Monitor blinks after switching