SN75DP120 / unused main link output

K.Yaita

Other Parts Discussed in Thread: SN75DP120

Hi Team,

My customer considers to use SN75DP120 and I was asked the following question.
How to do with unused main link outputs?
Can I leave the pin to be open?

Best Regards,
Yaita / Japan disty

over 9 years ago

0 Moises Garcia over 9 years ago

TI__Mastermind 23815 points

Hi Kensuke,

Is this an eDP application? will they use 2 lane only?

They may try DP119, this is a two lane repeater for eDP, the unused lanes can be left floated.

Regards

0 K.Yaita over 9 years ago in reply to Moises Garcia

Guru 29720 points

Hi Moises-san,

I appreciate for your support.
I heard it isn't eDP but DP application and use only 1 lane, so my customer considers SN75DP120.

Best Regards,
Yaita

0 K.Yaita over 9 years ago in reply to K.Yaita

Guru 29720 points

Hi Moises-san,

I would like to confirm just in case.

>the unused lanes can be left floated.
Can I leave the unused main link input pins (IN1p, IN1n, IN2p, IN2n, IN3p, IN3n) to be open as well as unused main link outputs?
My customer considers to use only 1 lane.

Best Regards,
Yaita

0 Moises Garcia over 9 years ago in reply to K.Yaita

TI__Mastermind 23815 points

Hi Yaita-san,

If customer will use only one lane it will be IN1, and since DP120 monitor AUX link training, when it detects only one lane is used it will enable only IN1.

So you must connect to IN1 and may leave unused IN2, IN3 and IN4.

Regards

0 K.Yaita over 9 years ago in reply to Moises Garcia

Guru 29720 points

Hi Moises-san,

Thank you for your support.
However, it seems SN75DP120 doesn't have IN4 pin as datasheet page 4.
I assumed unused input pins are 2,3,5,6,8,9 pin.

http://www.ti.com/lit/ds/symlink/sn75dp120.pdf

I believe pin names of BLOCK DIAGRAM in page 3 is typo.. Is my understanding correct?

Best Regards,
Yaita

0 Moises Garcia over 9 years ago in reply to K.Yaita

TI__Mastermind 23815 points

You are right, my previous response was based on the diagram and it looked weird.
We need to fix the diagram thanks for noticing,

So, If there are IN0, IN1, IN2 and IN3 and you only use IN0, then, IN1, IN2 and IN3 can be left open.

Regards

0 K.Yaita over 9 years ago in reply to Moises Garcia

Guru 29720 points

Moises-san,

Thank you for your support.
I understood.

Best Regards,
Yaita

Interface

Interface forum

SN75DP120 / unused main link output