Re: [SI-LIST] : SSTL Versus full swing PROS/CONS

D. C. Sessions (dc.sessions@vlsi.com)
Wed, 19 May 1999 08:11:52 -0700

"Yehuda D. Yizraeli" wrote:

> I am looking for more data on the pros/cons of SSTL versus
> full swing data XFR into memories. All aspects are important/interesting.

SSTL is pretty completely specified, but "full-swing" could be
anything. Do you mean rail-to-rail reflected-wave switching on
a point-to-point connection with centered diffamp receivers (sort
of like AGP) or what?

Source-terminated full-swing with precision receivers can be as
fast as SSTL and use less power. Emphasis: _can_

OTOH if you have a multi-drop bus it gets very hard to keep the
reflections from seriously degrading performance. Also, series
terminating an IC driver is iffy; doing it on the silicon gives
a pretty wide range of incident wave amplitudes across process
and temperature. Doing it off-chip is ugly for other reasons.

YMMV. HTH. HAND.

-- 
D. C. Sessions
dc.sessions@vlsi.com

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