DS90UH948-Q1: 949-948：Connection

Masaaki Sugiyama68

Expert 1445 points

Part Number: DS90UH948-Q1

Dear support team;

Our customer wants the following connection.

Can we use this connection?

And,how should unused pins be?

Best Regards,

Masaaki Sugiyama

over 7 years ago

0 Hamzeh Jaradat over 7 years ago

TI__Guru** 108900 points

Hello,
Yes, you can use this topology. but note that you will use either replication mode, i.e. having duplicated output to both Deserializer or send Even pixels to one Deserializer and Odd pixels to the other Deserializer.
The question is, instead of using two times 948 Deserializer as single input, why do not you use 928 instead?

0 Masaaki Sugiyama68 over 7 years ago in reply to Hamzeh Jaradat

Expert 1445 points

Dear Hamzeh-san;

Thank you for your reply.
I understand about replication mode.
Our customer use about evaluation only, not production.
So, they use the two 948.
Could you tell me that the unused pins are open?
In this case, when HDMI connect, does the HPD pin of 949 become "H"?

Best Regards,
Masaaki Sugiyama

0 Hamzeh Jaradat over 7 years ago in reply to Masaaki Sugiyama68

TI__Guru** 108900 points

Hello Masaaki-san,

Which exactly unused pins do you mean? If you mean RIN1 +/- then yes, you can leave them open.

If everything is connected correctly and 5V is also becomes available from the source, then yes HPD will become high.

0 Masaaki Sugiyama68 over 7 years ago in reply to Hamzeh Jaradat

Expert 1445 points

Dear Hamzeh-san;

Thank you for your quick support.
Unused pins mean RIN1+/- of 948.
I understand that we can leave them open.

If 949 disconnect 948(ROUT0+/- and ROUT1+/- open), does HPD become "H"?

Best Regards,
Masaaki Sugiyama

0 Hamzeh Jaradat over 7 years ago in reply to Masaaki Sugiyama68

TI__Guru** 108900 points

HPD has nothing to do with the 948 or ROUT+/-. HPD is to indicate that the Serializer is ready and receiving HDMI signal from the source.

0 Masaaki Sugiyama68 over 7 years ago in reply to Hamzeh Jaradat

Expert 1445 points

Dear Hamzeh-san;

Thank you for quick reply.
I have a last question.
Does HPD become "H" after or before receiving HDMI signal from the source?
I think that you mentioned after receiving HDMI signal.
If it is before, what is the trigger for HPD="H"?

Best Regards,
Masaaki Sugiyama

0 Masaaki Sugiyama68 over 7 years ago in reply to Masaaki Sugiyama68

Expert 1445 points

Dear Hamzeh-san;

Could you reply me?

Best Regards,

Masaaki Sugiyama

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DS90UH948-Q1: 949-948：Connection