[SI-LIST] Re: DDR2 vs. DDR3
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: Arun Kumar P N <arun@xxxxxxxxxxxxxxxx>
- Date: Mon, 23 Nov 2009 14:57:04 +0100
Hello,
I cutted one page out of my "Memory interface" training which has the
key differences between different Memory generations listed.
As the list does not support attachements I have put it on my website
under downloads/presentations.
Hope this link works:
http://www.eyeknowhow.de/index.php?option=com_rokdownloads&view=folder&Itemid=17&id=2:presentations
Due to the differences on the CA bus on DIMM there are quite some more
special things on DDR3 (e. g. Write levelization) which are quite
complex and would require some more explanation.
If no need some more background there just let me know ...
I anyhow wanted to make this table a little bigger and add things like
pre-fetch, MRS features, ... So I guess during this week I can post an
updated table ...
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
Veilchenstrasse 1
94554 Moos
Tel.: +49 (0)9938 / 902 083
Mobile: +49 (0)176 / 787 787 77
Fax: +49 (0)3212 / 121 9008
Arun Kumar P N schrieb:
> Hi Jenni,
>
> DDR3 using 8n-prefetch architecture and DDr2 using 4n-prefetch architecture.
>
> For 8n-prefetch architecture, the internal core will operate at n frequency,
> IO buffer operate at 4n frequency at the last the last data frequency will
> be double the IO buffer frequency.ie.,8n.
>
> Example, DRAM core frequency = 100MHz
> IO buffer frequency = 4*100MHz
> Data frequcny(sample at both raising and falling edge) =
> 2*4*100MHz.
>
> For 4n-prefetch architecture, the IO buffer frequency will be double the
> core frequency.
>
> I hope this will be helpful for you.
>
> Regards,
>
> Arun Kumar P N
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Jennifer Maharani
> Sent: Monday, November 23, 2009 5:59 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] DDR2 vs. DDR3
>
> Dear all,
>
> What are the differences between the two other than the speed?
>
> Many thanks,
> Jenni
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