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AR# 10159

3.1i XST - ERROR:NgdBuild:455 - logical net "xxxx" has multiple drivers.

Description

Keywords: LVDS, IOSTANDARD, VHDL, Verilog, IBUF, OBUF

Urgency: Standard

General Description:
XST does not recognize IBUF_LVDS, IBUF_LVPECL, OBUF_LVDS, OBUF_LVPECL, IOBUF_LVDS and IOBUF_LVPECL as valid primitves. If you try to instantiate the LVDS buffers, XST will insert I/O buffers. When the design is run through the implementation tools, errors such as the following occur:

ERROR:NgdBuild:455 - logical net "xxxx" has multiple drivers

Solution

This problem is fixed in the latest 3.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates.
The first service pack containing the fix is 3.1i Service Pack 3.
AR# 10159
Date Created 09/15/2000
Last Updated 08/19/2002
Status Archive
Type General Article