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clock domain crossing and synchronizing

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sree205

sree205

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Hi,
Could anyone tell me some methods of synchronizing control signals which cross clock domains ? i only know of double flopping the signal. even after that if it leads to metastability, what else can be done?
 

Following document is very useful before you r looking for a synchron
 

thanks for the link. i've already gone through that document. I'm specifically looking for multi-stage synchronizers and their impact on MTBF.

Thanks !!
 

Sree,
Since you already know about the MTBF, a two stage synchronizer itself has a pretty good MT. Generally the rule of thumb is that the metastability resolves itself in a time period around ~20Th/su. So as long as your frequency isn't the limiter (ie. freq of operation is 20Th/su) a two stage synchronizer should do. In practically applications (systems designed at Ghz) we use a 3 stage synchronizer.
Much of what we contemplate here is just an educated guess any engineer makes at the expense of solid understanding of reliability.

-B
 

    sree205

    sree205

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