Mr. Nenni of SemiWiki has been saying since March that the 28nm rumors about TSMC shutting down production were false, http://www.semiwiki.com/forum/content/1091-tsmc-absolutely-did-not-halt-28nm-production.html
I would agree with Mr. Nenni 100% on that. I checked with several sources and found that it was highly unlikely that TSMC shut down 28-nm production. I reported this in the EE Times Forum, also in March:
The point of mentioning this rumor in the story was to support the statement that TSMC has been dogged by rumors about it's 28-nm process.
Blog Make a Frequency Plan Tom Burke 17 comments When designing a printed circuit board, you should develop a frequency plan, something that can be easily overlooked. A frequency plan should be one of your first steps ...