Metastability MTBF in Cyclone

Feb 01, 2005 3 Replies
G

Hi All,



I have a Cyclone application with a long lifetime and a high realibility requirement (i.e. no subsequent CRC's and retries, the IGBT just turns on)



I am trying to assess the MTBF of metastable events. I have 166MHz clock and



10kHz async. inputs with a single sync. latch. Latencies are best avoided so I'd rather not double sync. unless I have to.

The Altera app. note gives an expression for MTBF based on the metastable time Tmet and two device dependant parameters (C1 and C2)



Are these parameter values available for Cyclone ?



Thanks, Gary


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P

realibility

turns on)

clock and

avoided so

metastable

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B

Peter - Do you have any documentation on this? Thanks! Ben

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P

Well, I can obviously not speak for Altera ;-) But go to the Xilinx website and either scan the TechXclusives (good stuff!) or search for "metastable" or for my name, and you will find quantitative data, XAPP094 is the best source, but it is being refurbished right now... Peter Alfke, Xilinx Applications

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