[SI-LIST] Re: Digital Interconnect
- From: Jory McKinley <jory_mckinley@xxxxxxxxx>
- To: Mohamad Haghtalab <mohaghtalab@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Sun, 23 Aug 2009 12:10:17 -0700 (PDT)
Hello Mohamad,
Check if you have the option to turn on ODT at the load. In this case you will
not need source termination and should sweep various stripline impedance with
various source driver and load ODT settings. If you have no ODT then check if
you have space to implement load termination (resistor to VDD/2) and then sweep
your driver settings with various stripline impedances to determine timing and
signal integrity. Remember that you will need to simulate Address/Control in
one direction and Data/Strobe in both directions.
Regards,
-Jory
________________________________
From: Mohamad Haghtalab <mohaghtalab@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Sunday, August 23, 2009 7:03:46 AM
Subject: [SI-LIST] Digital Interconnect
Hi all
I'm working on a PCB which contains SRAMs connected to FPGA through
striplines,i dont have enough space to implement source termination (inserting
resistors) ,i think (is this true?)
most of output resistor of digital I/O buffers are low e.g less than 30 ohm,if
we assume that this is true for the case we are using ,then is this good idea
to route this lines in a
lowest possible impedance?,with considering this fact that we have limitation
in lowering the impedance of stripline what is the best work we should do to
reach best design in terms of signal integrity issues without using of
resistors for source termination?
Thanks for Help
Regards
M.haghtalab
------------------------------------------------------------------
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:
