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AR# 20830

8.1i sp1 IBISWriter, Virtex-4 - Low Capacitance differential inputs do not show up in the [Diff Pin] list


Virtex-4 IBIS files generated by IBISWriter will omit any Low Capacitance differential inputs from the [Diff Pin] list. Low Capacitance inputs are assigned by way of the CAPACITANCE attribute (see the Virtex-4 User Guide for details).


This problem will be fixed in a future ISE design tools release.  


The [Diff Pin] list can be manually annotated to include all differential inputs. For minimum differential voltage requirements, refer to the Virtex-4 DC and Switching Characteristics Data Sheet.

AR# 20830
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article