[SI-LIST] Allowed Crosstalk on DDR2 Strobe (DQS)
- From: Hirshtal Itzhak <ihirshtal@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 02 Feb 2009 17:03:45 +0200
Hello all,
I would like to ask if there is any specification which claims the
amount of allowed crosstalk on the (single-ended or differential) DQS of
the DDR2 interface.
As I understand it, assuming the signal is generally well behaved (no
significant overshoot or ringing and is monotonic throughout its
threshold region), then the crucial thing is what happens if and when a
noise from another signal happens to ride on top of the DQS signal -at
the time of its threshold transfer region. This event may cause the
signal to be non-monotonic and this seems to me the worst threat to the
signal functioning.
But what level of crosstalk will cause such non-monotonicity to disrupt
the signal functionality? At principle, any level should be dis-allowed,
even 1mV! But this seems to be un-reasonable, as on embedded
applications the routing is so dense this isn't an achievable goal.
Could anyone answer this question - from the DDR2 specification or from
any electrical reasoning?
Thanks in advance
Itzhak Hirshtal
The information contained in this communication is proprietary to Israel
Aerospace Industries Ltd., ELTA Systems Ltd.
and/or third parties, may contain classified or privileged information, and is
intended only for
the use of the intended addressee thereof. If you are not the intended
addressee, please be aware
that any use, disclosure, distribution and/or copying of this communication is
strictly prohibited.
If you receive this communication in error, please notify the sender
immediately and delete it from
your computer. Thank you.
This message is processed by the PrivaWall Email Security Server.
------------------------------------------------------------------
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:
