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

Muranyi, Arpad (arpad.muranyi@intel.com)
Mon, 24 May 1999 11:20:24 -0700

D.C.,

I would appreciate if you would not use all these acronyms.

"YMMV. HTH. HAND." etc...

I have no idea what they stand for, and I bet many of the foreign
readers on the list have the same problem. I know it takes a lot of
time to write out frequently used common expressions, and in this
world we have everything but time, but if this is such a big problem
for you, come up with some nifty keyboard macros that will automatically
write it out for you on pressing one or a few keys.

Thanks,

Arpad
======================================================================

-----Original Message-----
From: D. C. Sessions [mailto:dc.sessions@vlsi.com]
Sent: Wednesday, May 19, 1999 8:12 AM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : SSTL Versus full swing PROS/CONS

"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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