UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

cancel
Showing results for 
Search instead for 
Did you mean: 
Explorer
Explorer
2,082 Views
Registered: ‎03-08-2018

What is the difference between TMDS and LVDS?

Jump to solution

Hi.

 

Now I'm stuck on how to implement HDMI interface within Spartan6lx16 - FT256 -2C.

Currently I'm using the circuit as the below,.

 

q101.jpg

 

 

and I made the UCF script as the below.

 

 

q102.JPG

 

 

But I'm confused that which UCF define is correct to implement the HDMI? LVDS or TMDS ?

and I want to know whether HDMI female header circuit is correctly designed or not. If there is not problem, then which one should I have to use to ucf re-definition? What am I supposed to do to modify the ucf ?

 

Tags (1)
0 Kudos
1 Solution

Accepted Solutions
Scholar drjohnsmith
Scholar
2,190 Views
Registered: ‎07-09-2009

Re: What is the difference between TMDS and LVDS?

Jump to solution

As you have seen, the FPGA has a number of IO electrical standards,

 

HDMI

https://en.wikipedia.org/wiki/HDMI

 

is as you know, a specification for connecting equipment,

 

HDMI, specifies to use for one of its interfaces a form of

 

Transition-Minimized Differential Signaling (TMDS)

 

https://en.wikipedia.org/wiki/Transition-minimized_differential_signaling

 

 

You will note that the FPGA IO is just the voltage / current specification,

     whilst the HDMI / TMDS specification covers other things sch as line encoding, 4b/5b encoding

 

 

One specifies the electrical IO standards of the FPGA in the UCF,

     and TMDS is not one of the options, as TMDS is as mentioned,  not just electrical but format.

 

 

The example of the UCF you give thus can not have TMDS as an IO standard.

 

 

 

 

 

0 Kudos
3 Replies
Highlighted
Scholar drjohnsmith
Scholar
2,048 Views
Registered: ‎07-09-2009

Re: What is the difference between TMDS and LVDS?

Jump to solution

have a look at the chips data sheet

 

there is no IO standard of TMDS.

 

https://www.xilinx.com/support/documentation/user_guides/ug381.pdf

 

 

0 Kudos
Explorer
Explorer
2,033 Views
Registered: ‎03-08-2018

Re: What is the difference between TMDS and LVDS?

Jump to solution

@drjohnsmith 

 

What does there is no IO standard of TMDS mean?

 

What is the 36 page Differential I/O Standards ?

0 Kudos
Scholar drjohnsmith
Scholar
2,191 Views
Registered: ‎07-09-2009

Re: What is the difference between TMDS and LVDS?

Jump to solution

As you have seen, the FPGA has a number of IO electrical standards,

 

HDMI

https://en.wikipedia.org/wiki/HDMI

 

is as you know, a specification for connecting equipment,

 

HDMI, specifies to use for one of its interfaces a form of

 

Transition-Minimized Differential Signaling (TMDS)

 

https://en.wikipedia.org/wiki/Transition-minimized_differential_signaling

 

 

You will note that the FPGA IO is just the voltage / current specification,

     whilst the HDMI / TMDS specification covers other things sch as line encoding, 4b/5b encoding

 

 

One specifies the electrical IO standards of the FPGA in the UCF,

     and TMDS is not one of the options, as TMDS is as mentioned,  not just electrical but format.

 

 

The example of the UCF you give thus can not have TMDS as an IO standard.

 

 

 

 

 

0 Kudos