Hi,
We have occur DP signal not stable issue.
Detail block diagram and schematic I will send in privacy massage. Please add me to friend.
Below is four mode behavior.
Mode A: Both MUXes switch to external DP input (MUX PORTB).
Mode B: Both MUXes switch to internal MST HUB (MUX PORTA).
Mode C: MUX_1 switches to external DP input (MUX PORTB), MUX_2 switches to internal MST HUB (MUX PORTA).
Mode D: MUX_1 switches to internal MST HUB (MUX PORTA), MUX_2 switches to external DP input (MUX PORTB).
In Mode A, external DP input with 2M cable, switch to external DP output 2M cable, sometimes can't detect DP signal and no srceen.
We have tried to change EQ to highest gain 14.4dB seen have a little improve, fail rate will be lower but stil fail sometimes.
It may caused by DP signal already attenuation so may need add re-driver also on DP input side?
Other strange thing is when MST hub not enable, this issue is disappears. But in mode A the DP signal not passthrough the MST hub, But seems have some interference from MST hub.
Could we also provide the layout file to you for reveiw?
Thanks!
Jeff
