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AR# 23087

8.1i Timing Anlayzer/TRCE - Clock uncertainty being analyzed in hold time on global clock


When I do timing analysis on my design, I receive a hold violation on a global or BUFG clock. The Clock Uncertainty value is non-zero and results in the hold violation. A hold analysis on a global clock should not include clock uncertainty. When will this be fixed?


This problem has been fixed in the latest 8.1i Service Pack available at:

The first service pack containing the fix is 8.1i Service Pack 3.
AR# 23087
日期 10/26/2011
状态 Archive
Type 综合文章