[SI-LIST] Re: SDRAM data issues
- From: "Nguyen, Mike" <Mike_Nguyen@xxxxxxxxxxxxxxxxx>
- To: <jthomas@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 May 2003 10:00:06 -0700
Putting a probe adds capacitance to the data pin and increases Hold
time. You said the DRAM is very
Close to the ASIC, then make sure your clock is <=3D shortest data =
trace.
My guess is you have more margin on setup time.
Mike
-----Original Message-----
From: John Thomas [mailto:jthomas@xxxxxxxxxxx]=20
Sent: Thursday, May 15, 2003 8:41 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: SDRAM data issues
Not a silly question at all. Another one is the CAS latency being used.
A common mistake is to try to run in the CL2 mode but at the maximum CL3
frequency.
Best Regards,
John Thomas
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ken Cantrell
Sent: Thursday, May 15, 2003 9:28 AM
To: sankar.karuppannan@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: SDRAM data issues
Sankar,
Silly first question - is the SDRAM rated for 115 MHz, or only 100 MHz?
Perhaps the probe capacitance is slowing the edge down enough for it to
work. Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Sankar karuppannan
Sent: Thursday, May 15, 2003 6:34 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] SDRAM data issues
Hi,
I am facing some problem in the SDRAM data lines. The problems are
whenever I am running more then 115MHz SDRAM read and write test is
failing. I connected logic analyzer to probe the signal then tests are
passing. In PCB SDRAM is placed very close to the ASIC. I do not know
the problem is due to the capacitance or ground. I gave sufficient
ground plane under the device. If any one knows the solution please help
me.
Thanks,
Sankar.K
Wipro Technologies,
72, Electronics City, Hosur Main Road,
Bangalore-561229.
Ph:+91-80-8520408 Extn: 4012/4031.
**************************Disclaimer************************************
Information contained in this E-MAIL being proprietary to Wipro Limited
is 'privileged' and 'confidential' and intended for use only by the
individual or entity to which it is addressed. You are notified that
any use, copying or dissemination of the information contained in the
E-MAIL in any manner whatsoever is strictly prohibited.
************************************************************************
***
------------------------------------------------------------------
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 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 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
-- Binary/unsupported file stripped by Ecartis --
-- Type: text/x-vcard
-- File: John Thomas (E-mail).vcf
------------------------------------------------------------------
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 archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages=20
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 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:
