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# 11950

11.1 NGDBuild - "ERROR:NgdBuild:19- Errors found while parsing constraint file '.ucf'."


When trying to lock signals or instances that are not in the design, NGDBuild (Translate) reports the following errors:

"ERROR:Parsers:11 - Encountered unrecognized constraint while parsing."

"ERROR:NGDBuild:19 - Errors found while parsing constraint file '<design>.ucf."


This error will occur if a constraint is applied to a net or instance that does not exist in the design. There are two ways to avoid this error:

1. Remove the offending constraint from the UCF file.

2. Select the "-aul" (Allow Unmatched LOC Constraints) switch in Translate (NGDBuild). Any unmatched LOC constraints will be ignored during implementation.

AR# 11950
Date 12/15/2012
Status Active
Type General Article
Page Bookmarked