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Altera(not everbody) recommends that and is meant to help achieve recovery/removal timing requirements so the two are not alternatives.
Does that mean it is not necessary to have a synchronous assertion since it has already been taken into account in recovery/removal?
Which double synchroniser you refer to?
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I was referring to the output of the synchronizer that feed into the aclr port of the system. Again, I do not understand why is it 'synchronous' since it is feeding the aclr port (which again is under recovery/removal)
http://1.bp.blogspot.com/_jwnl_zs6958/sdkgixi7uyi/aaaaaaaaawq/zvzv07l0pou/s320/sync_deass_async_***.jpg
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