[SI-LIST] tDQSCK
- From: "Fraiman, Edi" <Edi.Fraiman@xxxxxxxxxx>
- To: "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 30 Oct 2006 14:43:45 -0500
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Hi,=20
I have question about Micron DDR parameter tDQSCK=3DAccess window of DQS
from CK/CK#.=20
According Micron data sheet this time is jitter and not skew.=20
=20
Please see the diagram from Micron data sheet : the DQS signal could be
wider or thinner because max. and min. of tDQSCK.
But according to JEDEC JESD79E tDQSCK is skew from CK/CK# and DQS
could not be wider or thinner please see below diagram from JEDEC.
=20
The problem is when I prepare timing diagrams with TimingDesigner tool
if I assume than tDQSCK is jitter from CK/CK# and DQS could be wider
or thinner than I get time violation.
If I assume than tDQSCK is skew from CK/CK# and DQS could not be wider
or thinner than timing is OK.=20
Best regards,
Edi Fraiman
- - - - - Appended by Scientific Atlanta, a Cisco company - - - - -=20
This e-mail and any attachments may contain information which is confidenti=
al, proprietary, privileged or otherwise protected by law. The information =
is solely intended for the named addressee (or a person responsible for del=
ivering it to the addressee). If you are not the intended recipient of this=
message, you are not authorized to read, print, retain, copy or disseminat=
e this message or any part of it. If you have received this e-mail in error=
, please notify the sender immediately by return e-mail and delete it from =
your computer.
-- Binary/unsupported file stripped by Ecartis --
-- Type: image/jpeg
-- File: image001.jpg
-- Desc: image001.jpg
-- Binary/unsupported file stripped by Ecartis --
-- Type: image/gif
-- File: image002.gif
-- Desc: image002.gif
------------------------------------------------------------------
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 FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
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:
