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
422 Views
Registered: ‎10-28-2018

Spartan 7 - LVDS2.5V bidirectional interfacing with LVDS 3.3V input

Jump to solution

Hi

 

  I am planning to use the Spartan-7 LVDS 2.5V for bi-directional LVDS input and output. However, the LVDS input coming into the Spartan-7 is at 3.3V level and the Spartan-7 only supports LVDS 2.5V. Will this be acceptable? I am planning to set VCCO to 2.5V. 

   As for output, the LVDS level would be at 2.5V (I assume since this is an output from Spartan-7) and this output will be fed into the LCD Screen which has LVDS at 3.3V. I would like to know if this application for different LVDS voltage levels will work?


Thank you!

0 Kudos
1 Solution

Accepted Solutions
Xilinx Employee
Xilinx Employee
410 Views
Registered: ‎03-07-2018

Re: Spartan 7 - LVDS2.5V bidirectional interfacing with LVDS 3.3V input

Jump to solution

Hi @vivienwwp

 

LVDS signalling standard is independent of the supply voltage. 

Check VOD (Differential) & VOCM (Common Mode) specification of your external device; which you are going to interface with Spartan 7 FPGA.

As per my knowledge, If they are within range of VID & VICM of the Spartan-7 then you can interface them to each other.

Spartan 7 LVDS Spec.png

You can also check it by performing IBIS simulation.

 

EDIT1: Check https://www.xilinx.com/support/answers/43989.html for more details.

 

Regards,

Bhushan

-------------------------------------------------------------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.
Give Kudos to a post which you think is helpful and reply oriented.
-------------------------------------------------------------------------------------------------------------------------------------------------

Regards,
Bhushan

-------------------------------------------------------------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.
Give Kudos to a post which you think is helpful and reply oriented.
-------------------------------------------------------------------------------------------------------------------------------------------------
2 Replies
Xilinx Employee
Xilinx Employee
411 Views
Registered: ‎03-07-2018

Re: Spartan 7 - LVDS2.5V bidirectional interfacing with LVDS 3.3V input

Jump to solution

Hi @vivienwwp

 

LVDS signalling standard is independent of the supply voltage. 

Check VOD (Differential) & VOCM (Common Mode) specification of your external device; which you are going to interface with Spartan 7 FPGA.

As per my knowledge, If they are within range of VID & VICM of the Spartan-7 then you can interface them to each other.

Spartan 7 LVDS Spec.png

You can also check it by performing IBIS simulation.

 

EDIT1: Check https://www.xilinx.com/support/answers/43989.html for more details.

 

Regards,

Bhushan

-------------------------------------------------------------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.
Give Kudos to a post which you think is helpful and reply oriented.
-------------------------------------------------------------------------------------------------------------------------------------------------

Regards,
Bhushan

-------------------------------------------------------------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.
Give Kudos to a post which you think is helpful and reply oriented.
-------------------------------------------------------------------------------------------------------------------------------------------------
Explorer
Explorer
380 Views
Registered: ‎10-28-2018

Re: Spartan 7 - LVDS2.5V bidirectional interfacing with LVDS 3.3V input

Jump to solution

OK thank you!

0 Kudos