timing.twr

来自「在ISE环境下用VHDL写的8*9FIFO」· TWR 代码 · 共 18 行

Asterisk (*) preceding a constraint indicates it was not met.
   This may be due to a setup or hold violation.

------------------------------------------------------------------------------------------------------
  Constraint                                |  Check  | Worst Case |  Best Case | Timing |   Timing   
                                            |         |    Slack   | Achievable | Errors |    Score   
------------------------------------------------------------------------------------------------------
  Autotimespec constraint for clock net clk | SETUP   |         N/A|     5.541ns|     N/A|         429
  _BUFGP                                    | HOLD    |     2.529ns|            |       0|           0
------------------------------------------------------------------------------------------------------


1 constraint not met.
INFO:Timing:2761 - N/A entries in the Constraints list may indicate that the 
   constraint does not cover any paths or that it has no requested value.