Re: Re: [oc] PLL vs DLL

["kinysh asdf" <kinysh@hotmail.com>]

Hi:

And in ASIC DLL is much smaller than PLL.

bests
kinysh


>From: "robinluo" <robinluo@cytecht.com>
>Reply-To: cores@opencores.org
>To: "cores@opencores.org" <cores@opencores.org>
>Subject: Re: Re: [oc] PLL vs DLL
>Date: Thu, 27 Feb 2003 11:32:14 +0800
>
>Hi Richard Herveille,
>
>	Hehe!You are right,which one is better based on his detail application.
>Any thing,pls let me know.
>
>======= 2003-02-26 21:10:00 in your mail£º=======
>
> >> Estimado mayank,
> >>
> >> Con fecha miércoles, 26 de febrero de 2003, 8:06:29, escribió:
> >>
> >> mdb> or the full control on clock delays & clock phases,which
> >> mdb> architecture is preferrable PLL or DLL.i know tht each one has its
> >> mdb> advantages,but both altera & Xilinx claims tht their PLL(in
> >> mdb> stratix) & DLL(in virtex or spartan-IIE) architecture has an edge
> >> mdb> over other.getting large multiples of frequencies in PLL is also
> >> mdb> an added advantage.where i can find the comparison between the
> >> mdb> two.
> >>
> >>    I have no answer for your question, but i can tell you DLL are 
>faster
> >> and better than PLL, the only thing is that PLL have much more 
>resolution
> >> than DLL.
> >
> >So you have absolutely no underlying arguments, but you can tell us that 
>DLLs
> >are better ??? Are you a Xilinx fan??
> >
> >As said before both have their advantages and disvantages. DLLs can be
> >generated using pure digital blocks, you need some analog stuff for PLLs
> >(e.g. VCO). Due to the analog nature, PLLs usually require separate 
>power/gnd
> >pins that need some special attention. DLLs have some build in 
>hysteresis,
> >because the delay is digital - fixed delay steps -, but cannot generate
> >arbitrary frequencies, nor can they lock on any arbitrary input signal.
> >The DLLs fixed delay can cause the clock to jump, meaning the output 
>clock
> >doesn't have a nice 50/50 duty cycle. For a PLL this translates into 
>jitter,
> >I think I read something like plus/minus 500ps.
> >
> >OK now what is better, a PLL or a DLL? I guess the answer is, depends on 
>the
> >application and/or your preference.
> >
> >If you want to compare Altera's PLL and Xilinx DLL, check their websites. 
>They
> >both tell you why their choice is the better one. So you know the 
>strengths
> >and the weaknesses of both.
> >
> >Richard
> >
> >
> >>
> >>    Cheers
> >>
> >>
> >> mdb> --
> >> mdb> To unsubscribe from cores mailing list please visit
> >> http://www.opencores.org/mailinglists.shtml
> >
> >
> >--
> >To unsubscribe from cores mailing list please visit 
>http://www.opencores.org/mailinglists.shtml
> >
> >.
>
>= = = = = = = = = = = = = = = = = = = =
>
>
>Robin Luo
>Cytech Technology Ltd(Beijing Office)
>Tel:13911045792
>     8610-82684280 Ext 205
>Fax:8610-82684277
>E-mail:robinluo@cytecht.com
>Web:http://www.cytecht.com
>        2003-02-27
>
>
>--
>To unsubscribe from cores mailing list please visit 
>http://www.opencores.org/mailinglists.shtml


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