[SI-LIST] Re: SSTL-2 series termination in DDR Applications
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Anand.Kuriakose@xxxxxxxxxx
- Date: Thu, 06 Jun 2002 09:08:23 -0700
Anand,
My suggestion would be to try simulating an SSTL-2 bus with multiple
DIMMs with and without the motherboard series resistors. It will be
difficult for anyone to convince you of their need without some sort of
supporting data. Ultimately, the bus works with the resistors and does
not work without them. They serve to de-Q resonances which cause
ringing and close the data eye pattern.
Regards,
Scott
--
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
Anand.Kuriakose@xxxxxxxxxx wrote:
>
>Hi All,
>
>Why is it required to provide series termination on the DDR signals (SSTL
>logic)
>on the motherboard when the DDR DIMMs themselves have series termination on
>every signal (as the SSTL spec states) ? I think we can get reliable signal
>quality without these series terminaters on the motherboard. Correct me if i am
>wrong.
>
>Thanks in advance for all the valuable ideas.
>
>Regards,
>Anand.
>
>
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