DS90C387: DS90C387VJDX/NOPB - 10 Channel LVDS/Clock Interfacing with TFT.

Kacper Kurowski

Part Number: DS90C387

Good Afternoon,

I am designing a Hdmi to LVDS bridge and am having issues understanding how the connections from DS90C387VJDX/NOPB LVDS outputs should be connected to my TFT (i have attached for reference).

I have 8 differential data outputs (A0 to A7) and 2 differential Clock outputs (which are identical so can be interchanged).

My TFT requires that i provide 4 differential channels to provide the Odd data (OLVx), and 4 differential channels to provide the Even data (ELVx).

Which of the outputs from DS90C387VJDX/NOPB differential channels provide the odd data (that i can connect to OLV0 to OLV3) and which do i conect to the even (ELV0 to ELV3).

I appreciate any clarity on the matter as pg18 and pg19 are not clear.

www.ti.com/.../ds90c387.pdf

How am i to deduce if the TFT should be driven in DC-Balanced or Non-DC-Balanced mode?

I have provided Voltages/Logic input into configuration pins on the IC for reference:

BAL = HIGH

DUAL = HIGH

PD = LOW

R_FDE = HIGH

R_FB = HIGH

PLLSEL = HIGH

PRE = NC

P10 TFT.pdf

over 2 years ago

0 Ben Dattilo over 2 years ago

TI__Mastermind 25765 points

Hi Kacper,

I will look into this and get back to you Monday or Tuesday.

Regards,

Ben

0 Kacper Kurowski over 2 years ago

Prodigy 60 points

Hi Ben,

Thank you for looking into this for me.

Could i please have an answer as the PCB design is finished and we are just waiting to confirm the connections so we can get the PCB manufactured.

I would really appreaciate it.

Thank you and Best Regards,

Kacper

0 Kacper Kurowski over 2 years ago

Prodigy 60 points

Good Morning Ben,

I am trying to drive the attached TFT using the LVDS outputs from the IC DS90C387VJDX/NOPB.

2072.P10 TFT.pdf

I assumed the pins (on TFT) Labelled OLVx should be the odd differential pairs, and therefore the ELVx should be the Even. DS90C387VJDX/NOPB does not have the odd and even pins labelled, only A0 to A7....?

On page 19 of the datasheet, there is a pinout for when BAL = HIGH. (I assumed that the TFT is a new one and does not require BAL to be LOW).

https://www.ti.com/lit/ds/symlink/ds90c387.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1671087539714&ref_url=https%253A%252F%252Fwww.mouser.co.uk%252F

This is however where my issue begins, I have no way of being sure which of the Ax output LVDS pairs from DS90C387VJDX/NOPB should be connected to which input of the TFT's LVDS.

Is it always the case that A0 to A3 are Odd (A0 being Odd0 and A3 being Odd3?) and A4 to A7 are even (A3 being Even0 and A7 being Even3?).

Could you please provide some clarity on how to connect the TFT to the LVDS driver, i would really appreciate it.

Thank you and Best Regards,

Kacper

0 Ben Dattilo over 2 years ago in reply to Kacper Kurowski

TI__Mastermind 25765 points

Hi Kacper,

Sorry for the delay. This table from the datasheet may be helpful to you to decode some of the following graphics from the datasheet:

For your purposes, you will want to pay attention to the Y value, being odd or even.

As you can see, A0-A3 are odd, while A4-A7 are even, since "Y" is 1 for A0-A3, and 2 for A4-A7.

Does this answer your question?

Regards,

Ben

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DS90C387: DS90C387VJDX/NOPB - 10 Channel LVDS/Clock Interfacing with TFT.