[SI-LIST] Re: SSTL-2 differential receivers
- From: "Simon Assouad" <sassouad@xxxxxxxxxxxxxxxxxxxxx>
- To: <scott@xxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 24 Jan 2002 14:37:08 -0800
Scott,
Would it be problematic if we have multiple devices (requiring low skew
between them) to have some of them using the differential pairs and
others using one side only (as you described below?)
Thanks,
Simon.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Scott McMorrow
Sent: Thursday, January 24, 2002 1:13 PM
To: sassouad@xxxxxxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: SSTL-2 differential receivers
simon,
just drive one side of the sstl-2 signal directly into
a 2.5 volt cmos device with the standard vdd/2 termination.
the switching point of the differential signal should be
around Vtt (Vdd/2), which will be the same as the threshold
for standard CMOS (not TTL compatable CMOS), so the switching point
will be the same. You can adjust the termination resistor
to guarantee the necessary signal swing needed around
1.25 volts for the CMOS input.
Or you can
use a device like a xylinx virtex2 device which
has sstl-2 receivers and cmos drivers, along with built
in DLL's to synchronize the two, if necessary.
scott
Simon Assouad wrote:
> Hi All,
>
>
>
> I'm working with DDR SDRAM interface and need to convert a
differential
> SSTL-2 clock signal into a single-ended 2.5v CMOS signal. Anyone has
> any recommendation on a specific component (what and how)?
>
>
>
> Thanks,
>
> Simon.
>
>
>
> ------------------------------------------------------------------
> 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
>
>
>
>
>
--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com
------------------------------------------------------------------
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
Other related posts:
