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# 2959

Foundation Project Manager: Hierarchical, Error xr57 - Input signal drives more than one input buffer.


Keywords: Error, xr57, input, pad, buffer, ext

Urgency: Standard

General description:

Error xr57:
Input pad signal 'signalname' drives more than one input buffer.
A chip input can only drive 2 input signals when one drives a fast
input and the other drives a non-fast input. Make sure that two
input pad signals are not accidentally connected together.


A possible cause may be that a lower level (NON-TOP LEVEL)
schematic is referred to in the Foundation Project Manager.

Additional EXT records are referenced by this lower sheet, thus
causing for the above mentioned error message.

In the Foundation Project Manager, the following should appear:


If any underlying sheets are listed here that are NON
TOP-LEVEL sheets, remove them by highlighting and going to :

Document-> Remove

Now re-run Design Manager by clicking on the XACT-M1 icon.
AR# 2959
日期 04/29/1999
状态 Archive
Type 综合文章