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AR# 8682

3.1i - Constraints Editor - No I/O Standard available for clock signals

Description

keywords: I/O, IO, standard, clock, signal

Urgency: Standard

General Description:
For Virtex, Virtex-E, and Spartan-II, the I/O STANDARD options for clocks in the "Ports" tab
field is still not available for clocks in this column.

解决方案

The work-around is to manually modify the UCF file.

The following is an example of the correct syntax:

NET "my_net" IOSTANDARD = SSTL3_I;

This change is available 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 Service Pack 2.
AR# 8682
创建日期 02/24/2000
Last Updated 08/21/2002
状态 Archive
Type 综合文章