请问 这个DCM约束出错是啥原因？
时间：10-02
整理：3721RD
点击：
输入10M精致，DCM倍频22倍，par 时序出错信息：
Asterisk (*) preceding a constraint indicates it was not met.
This may be due to a setup or hold violation.
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Constraint | Check | Worst Case | Best Case | Timing | Timing
| | Slack | Achievable | Errors | Score
----------------------------------------------------------------------------------------------------------
* TS_dcm_clkfx = PERIOD TIMEGRP "dcm_clkfx" | SETUP | -8.458ns| 13.003ns| 7061| 4275927
TS_clk_ex / 22 HIGH 50% | HOLD | 0.296ns| | 0| 0
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TS_clk_ex = PERIOD TIMEGRP "clk_ex" 100 n | MINLOWPULSE | 68.000ns| 32.000ns| 0| 0
s HIGH 50% | | | | |
----------------------------------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------------------------------
* TS_dcm_clkfx = PERIOD TIMEGRP "dcm_clkfx" | SETUP | -8.458ns| 13.003ns| 7061| 4275927
TS_clk_ex / 22 HIGH 50% | HOLD | 0.296ns| | 0| 0
----------------------------------------------------------------------------------------------------------
TS_clk_ex = PERIOD TIMEGRP "clk_ex" 100 n | MINLOWPULSE | 68.000ns| 32.000ns| 0| 0
s HIGH 50% | | | | |
----------------------------------------------------------------------------------------------------------
貌似是你的设计到不了220Mhz。