Thank you for the fast reply. one more doubt . in that schematic i seen TPD12s521, is  it necessary to make 3:1 hdmi switcher. i directly connected all ports with TMDS361. is it ok?

Hai Moises Garcia,

thank you for all supports. i got an idea about the connection of 5v with hdmi ports (coonected to 5v supply via a diode right?). another thing i noticed that, is it required to pull up the TSCL and TSDA lines for a normal HDMI switcher(selector).

Thanks 

Hai Moises Garcia,

ok got it, we are designing the PCB based on your guidance. Thank you very much for your kindness and support...

Thanks and Regards,

See You,

Sivaprasad SM

Hi Sivaprasad,
You can use the schematic I sent you as is, it is the design of the EVM.
Regards

Dear Sir,

i keep that design as bible. since its first time we are using TMDS361B we have some confusions. 

1. what is 5V_PARTY means.where does it come.. (is it come from input HDMI port and connected to output port via a 0 ohm resistance and to 5v VCC with another diode )

2. we just need to select one desired HDMI input from three, so is it necessary the HPD circuits (if not how it should connect? can i connect HPD pin directly from HDMI port to TMDS361B  )

3. schematic shows that SCL and SDA pins are connected to TMDS361B   via  0 ohm resistor. whats its relevance, is it necessary?

Kindly help me. please clear my doubts.

Thanks and Regards,

Sivaprasad SM

Hi Sivaprasad,

I hope this clarifies it, if you have further questions please le tme know.

1. In HDMI source devices provide 5V on the connector and the sink receives it. The TMDS361 has 3 sink ports and 1 source, each sink port will receive 5V from its corresponding source, this 5V will be sent to the source port using the 0 ohms resistor, each sink port has a diode on between 5V_PARTY and the connector to avoid 5V from one sink connector provides 5V to another sink connector(no current backflow).
You can see the 5V for source connector is supplied from the EVM power supply too, with a diode to avoid current backflow from sink connectors.

2. The Hot Plug Detect(HPD) signals the video transmitter a display is plugged, place a 100k a pull-down on HPD_SNK to keep this signal low as default.

3. You can see in TPD12S521 datasheet SCL/SDA, HPD, and CEC have switches, so, in/out signals were not routed together. the 0-ohm resistors were added to close the path when TPD12S521 is not included. Long story short, if you are not using TPD12S521 just route it from the connector to TMDS361.

Sink devices monitor 5V from the source device, to check if a source is connected, then sink devices provide HPD, the source device monitors HPD to start video transmission, if HPD is high, the source device will read the display capabilities through SCL/SDA, then, the source device will start video transmission.

Regards

Dear Moises Garcia Sir,

Thank you for the detailed clarification. one more thing about HPD. let me explain our requirement that is we have three hdmi cameras which are connected to the corresponding hdmi connectors of TMDS361 and a hdmi monitor connected to the  output hdmi connector. at same time all three input hdmi connectors have signals from corresponding cameras. then we have to select any one from three manually using s1 s2 GPIO pins of TMDS361 to see the video from that selected camera.  so my doubt is since we are selecting the source device (camera) manually, then is it necessary to consider HPD and shall we eliminate the HPD circuits at three ports in the schematic. if so can we directly route the HPD from connector to TMDS and in this case what about HPD sink.

hope you will support me again.

Thanks 

Dear Moises Garcia  Sir,

THANK YOU...simple and detailed explanation. got good idea about TMDS361B and HDMI. you are really building engineers. thanks to you and TI. expecting your guidance and support again in future.

Thanks

Sivaprasad SM