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mkClockDivider Synchronization

 
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chiraag



Joined: 06 Aug 2011
Posts: 29

PostPosted: Thu May 12, 2016 3:34 am    Post subject: mkClockDivider Synchronization Reply with quote

Do the slow and fast clocks of an mkClockDivider belong to the same clock family? Or do they need synchronization primitives between them?
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quark
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Joined: 02 Nov 2007
Posts: 500

PostPosted: Thu May 12, 2016 3:47 pm    Post subject: Re: mkClockDivider Synchronization Reply with quote

They are different domains and will need a synchronizer. However, since the edges are aligned, you can use simpler synchronizers than would be needed in general. See, for example, mkSyncRegtToSlow, mkSyncRegToFast, mkSyncFIFOToSlow, and mkSyncFIFOToFast in the Clocks library, and mkAlignedFIFO in the AlignedFIFOs library.
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chiraag



Joined: 06 Aug 2011
Posts: 29

PostPosted: Fri May 13, 2016 1:58 am    Post subject: Reply with quote

I don't seem to have these synchronizers in my copy of the reference-guide. I am using version 2014.07.A. Do you have a different version?
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quark
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Joined: 02 Nov 2007
Posts: 500

PostPosted: Fri May 13, 2016 12:36 pm    Post subject: Reply with quote

Ah, it does appear that the first four synchronizers that I mentioned were made obsolete by the new AlignedFIFOs package, and were therefore removed from the documentation (although they still exist in the library).

There should be documentation on AlignedFIFOs in your reference guide (probably C.2.6). Let me know if it's not there.
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