[SI-LIST] Re: Would you follow the overshoot specs of the datasheet?
- From: "Long Yang" <long.0.yang@xxxxxxxxx>
- To: "liuluping 41830" <liuluping@xxxxxxxxxx>
- Date: Sat, 26 Jul 2008 15:24:41 +0800
Hi, Luping:
In general, signal integrity problme address two aspects: timing
and signal quality. Length match is related to timing problem, and
overshooting should be classed into the aspect of signal quality. So they
should be two different, so-how independent problems. Overshooting is most
casued by impedance mismatching, so generally, there is little overshooting
problem if impedance matched.
Long Yang
Groucho Marx - "A hospital bed is a parked taxi with the meter running."
On Sat, Jul 26, 2008 at 3:07 PM, liuluping 41830 <liuluping@xxxxxxxxxx>wrote:
> Hi all:
>
> This questions comes from yesterday's topic "DDR2 Trace Length Margin"
> which Jeff, Brian,Tom and many experts give very wonderful explains. Maybe
> the main problem is whether to follow the very tight specs , length mathch
> is one aspect,and the overshoot is another one which is often more trouble
> to deal.
> For example , a chip which contains 667Mbps DDR2 and 33MHz PCI interfaces
> ,the datasheet said that all the overshoot on the digital interface should
> less than +/-0.7V,in despite of
> the frequency,overshoot time ,would you follow this spec? How do you thinks
> about this?
>
> Regards,
>
> LIU Luping
>
> *****************************************************************
> This e-mail and its attachments contain confidential information from
> HUAWEI, which is intended only for the person or entity whose address is
> listed above. Any use of the information contained herein in any way
> (including, but not limited to, total or partial disclosure, reproduction,
> or dissemination) by persons other than the intended recipient(s) is
> prohibited. If you receive this e-mail in error, please notify the sender by
> phone or em
> ail immediately and delete it!
> *****************************************************************
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
