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!

AR# 13119

8.1i Virtex-II MAP - Why are my OBUFDS components not using the DIFFO signals for LVPECL?

描述

When I design with an OBUFDS and use LVPECL, the tools do not utilize the DIFFO_OUT in the DIFFM and the DIFFO_IN in the DIFFS. Why?

解决方案

The DIFFO_IN connection, which is used for LVDS outputs, is not supported in the hardware for LVPECL_33 outputs. For LVPECL_33 outputs, normal output paths are used to drive both DIFFM and DIFFS paths. A MAXSKEW constraint should be used to minimize skew between the DIFFM and DIFFS paths.

AR# 13119
日期 12/15/2012
状态 Active
Type 综合文章
的页面