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AR# 10509

3.1i SP5 Constraints Editor, Virtex-E - Cannot select LVCMOS18 I/O standard

Description

General Description:

Using A3.1i_sp5, I am targeting a Virtex-E design. When I attempt to select the LVCMOS18 I/O standard in Constraints Editor, the tool allows me to select it in the drop-down menu, but I am unable to set it. As soon as I select the LVCMOS18, the box becomes grayed out and the I/O standard is not set.

Solution

To work around this problem, manually specify the I/O standard in the UCF file.

This was fixed in the 4.1i software.

AR# 10509
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article