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AR# 16322

Schematic - A schematic check leads to "Error: Bus 'xxx' and its sub-bus are connected to different I/O ports"

Description

When I run the "Check Schematic" process, the following error occurs:

"Error Bus 'xxx' and its sub-bus are connected to different I/O ports."

However, there do not appear to be any problems with the schematic.

Solution

This error is valid if a member (or members) of an I/O bus is attached to its own I/O port.

For example:

The bus mybus (4:0) is connected to an input port, and mybus (4) is also connected to its own input port.

If the design appears to be correct and this error is still reported, please open a WebCase with Xilinx Customer Support at:

http://support.xilinx.com/support/clearexpress/websupport.htm

If erroneous data exists in the schematic file, it can generally be filtered out by cutting and pasting all visible elements of a schematic sheet as follows:

1. Use your mouse to select everything on the schematic.

2. Click the "Cut" button.

3. Click the "Paste" button and paste the schematic.

4. If you perform the "Check Schematic" process, the error should not be reported.

AR# 16322
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article