In Free-run mode, the system clock is locked local high-steady Oscillator. In Locked mode, the SEC can locked one of all input referenced clock.
系统时钟支持自由振荡、保持和跟踪3种工作模式;在自由振荡模式下,系统时钟直接跟踪本地的高稳定度的晶振时钟;在跟踪模式下,SEC可以从输入的参考时钟源中任选一路进行跟踪锁定,当参考源切换时,系统时钟输出稳定;而当所有参考源均丢失时,SEC进入保持模式,此时仍然输出高稳定度的系统时钟。
参考来源 - 基于FPGA的SDH设备时钟的设计与实现·2,447,543篇论文数据,部分数据来源于NoteExpress
以上来源于: WordNet
At any given time however some mice escape and run free.
然而有时候一些老鼠会跑出去。
If the suspect has no previous criminal record and the judge feels that he will return to court rather than run away, he can go free.
如果犯罪嫌疑人没有前科,并且法官认为他会回到法庭而不是逃跑,那么他可以获得自由。
Free Range eggs are also laid by hens that enjoy the freedom of a hen-house, but have the added benefit of access to an outside run.
散养鸡蛋也可能是这样的母鸡下的——它们在鸡舍里享受着自由,而且有额外的福利可以在外面跑。
The run-up to the 2011 elections has reignited concerns about a free,fair and credible vote in Africa's most populous nation.
VOA: standard.2009.08.22
"We are committed to helping more Americans to get the health care coverage they need, not through nationalizing the system with a costly government-run plan, but rather by supporting free-market incentives to help small business owners to make coverage more accessible and affordable,".
VOA: standard.2009.08.08
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