[SI-LIST] Re: termination for routing 8 SDRAMs to single Processor
- From: "Kenneth W. Egan" <kegan@xxxxxxxxxxxxx>
- To: <dp@xxxxxxxxxxx>, <aavinda12@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 10 Aug 2005 21:21:52 -0500
The question might not be one of stability, but one of reliability in =
the
long term. Sure, you'll probably meet setup and hold to/from the SDRAM.
However, SDRAM typically has some pretty hot drivers (that I've seen,
simulated and measured in circuit ) and the real issue is over stressing =
The input protection on the receiver, i.e. overshoot issues.
Failure modes in this case may not occur until much later in time.
KWE
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Dimiter Popoff
Sent: Wednesday, August 10, 2005 8:00 PM
To: aavinda12@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: termination for routing 8 SDRAMs to single =
Processor
I have rooted 8 x8 SDRAMs to an 8240 without any terminations and it =
worked
remarkably stable. However, I had 64 data bits rather than 32.
I had put 4 SDRAM chips on top and 4 on the bottom of the board, =
practically
next to the CPU, no connectors between.
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
------------------------------------------------------
-------Original Message-------
> From: Aravnda G <aavinda12@xxxxxxxxx>
> Subject: [SI-LIST] termination for routing 8 SDRAMs to single=20
> Processor
> Sent: Aug 11 '05 03:29
>=20
> Hi All,
> I am working with a micro-processor conneted to 8 SDRAM with 12 =
address
lines to all SDRAMs and 32 data lines each to two sets of four SDRAMs. I =
was
wondering if anyone has managed to route this sort of topology without =
using
terminations. If so please send information on topology used. The IO are
lvttl compatible at 3.3V. Any input on routing possibilities is welcome.
> =20
> Thanks & Regards,
> Alex.
> =20
> ---------------------------------
> Yahoo! Mail
> Stay connected, organized, and protected. Take the tour
> =20
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> =20
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
> =20
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> =20
> List FAQ wiki page is located at:
> =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0http://si-list.org/wiki/w=
iki.pl?Si-List_FAQ
> =20
> List technical documents are available at:
> =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0http://www.si-list.org
> =20
> 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
> =A0=A0
> =20
> =20
-------Original Message-------
------------------------------------------------------------------
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: =20
//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
=20
------------------------------------------------------------------
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:
