AR# 8682: 3.1i - Constraints Editor - No I/O Standard available for clock signals
AR# 8682
3.1i - Constraints Editor - No I/O Standard available for clock signals
描述
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: