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# 29989

10.1 Floorplan Editor - IOB Attributes are always written to the top.ucf


There are two constraints files in the design. The "top.ucf" file is set by default for New Constraints, and the other one contains LOCs for a bunch of pins. 


If you add other attributes to this IOB (e.g., Drive, Slew, Termination, etc.), they are written to the "top.ucf", not added to the existing constraints, and the Constraint File cell is updated to multiple. 


The tool does not add IOB attributes to the UCF containing the existing constraints. Why?


This is a known issue with Floorplan Editor.

AR# 29989
Date 05/20/2014
Status Archive
Type General Article
Page Bookmarked