AR# 8602: 2.1i Ngdanno: Warning: Anno:26 - physical components for which 100% back annotation is not possible
AR# 8602
2.1i Ngdanno: Warning: Anno:26 - physical components for which 100% back annotation is not possible
Description
Keywords: ngdanno, anno, 26, 100, back, annotation, possible
Urgency: Standard
General Description: After using a blockram in a design the following warning comes back from ngdanno: WARNING:Anno:26 - NGDANNO found physical components for which 100 percent back-annotation is not possible. (These components are listed below.)
解决方案
You can safely ignore this warning. The reason this warning is displayed is because blockrams can have a huge denomination of logic. It can take ngdanno a long time to parse the logical form of a blockram. To save on effort, ngdanno replaces the logical form of the blockram with its physical component. This results in a fully simulatable component which now contains hierarchy. All the names going into the blockram will be the same. The blockrams name will change slightly to reflect the new hierarchy but the user name for the blockram will be there.
This warning will disappear in the next release of the software.