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General Description: If the NGD that has a PERIOD defined, but the
UCF doesn't, it can not be deleted or changed in the Constraint Editor.
If a new PERIOD constraint is created in CE the group is added to
the ucf but not the new PERIOD Timespec.
To resolve this issue open the UCF file in a text editor and add the desired
constraint. For Example:
TIMESPEC "TS_CLK" = PERIOD "CLK" 20 ns;
AR# 5353 | |
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日期 | 01/18/2010 |
状态 | Archive |
Type | 综合文章 |