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AR# 62063

7 Series - Bidirectional LVDS termination schemes

Description

Is bidirectional LVDS supported on 7 Series devices?

What is the required termination scheme?

How does DIFF_TERM behave?

Solution

Bidirectional LVDS requires differential termination on both receivers.


7 series HP I/Os can support the LVDS I/O Standard in a bidirectional implementation. 


Internal Differential Termination has the following behavior in this use mode:




7 series HR I/Os can support the LVDS_25 standard in a bi-directional implementation in Vivado 2013.1 and later and ISE 14.5 and later.

Internal Differential Termination has the following behavior in this use mode:


This change to the internal differential termination implementation in the later revisions of the software ( Vivado 2013.2/ISE 14.6) also affects the OBUFTDS primitive in the HR I/Os:
 







AR# 62063
Date Created 09/17/2014
Last Updated 04/28/2015
Status Active
Type General Article
Devices
  • Artix-7
  • Kintex-7
  • Virtex-7