From: Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Of rubidium life and piggy-bank anemia.... Date: Sun, 02 Dec 2007 10:56:34 +1300 Message-ID: <[EMAIL PROTECTED]>
> Poul-Henning Kamp wrote: > > In message <[EMAIL PROTECTED]>, Bruce Griffiths writes: > > > >> Poul-Henning Kamp wrote: > >> > > > > > > > >> The point is that actually using latches in this way is considered poor > >> design practice when crossing clock domains. > >> > > > > The latches do NOT span clock domains, they are in the same domain > > as the counter. > > > > The signals that make captures the counter value in the latch is > > synchronized to the global clock using 3 D flip-flops. > > > > > You are missing, the point using latches latched by the output of a > synchroniser is considered bad design practice you should use gated D > flipflops instead. The problem is that he calles the DFFs latches. The problem with the term latches is that they sound like a good generic term, but really isn't. He would not be able to synthesize the design if there where a single latch in it. However, it is full of DFFs! Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
