Re: [SI-LIST] : Comments on proposed standard

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From: D. C. Sessions (dcs@lumbercartel.com)
Date: Tue Jan 09 2001 - 14:21:47 PST


On Friday 05 January 2001 10:19, Charles Hill wrote:
# DC,
#
# I remember your intriguing request, and have now had some time for my ideas
# to jell. Your draft is insightful and interesting. I think there are some
# things you left out.
#
# First, define the problem. "intense demand for short IC-to-IC connections
# at absurd signaling rates" -- Problem: Transfer digital information between
# ICs at ever higher speeds and accommodate trends in IC technology. Digital
# information is sequences of symbols (bits), a discrete time, discrete
# amplitude set. The transmission channel is continuous time, continuous
# amplitude. So what you've left out or assumed is the translation between
# these two domains, the detection process. There are two parts to this, the
# amplitude and the time. Assuming a conventional amplitude thresholding
# scheme, it leaves the time the clocking. So is that separate clocking, or
# embedded clocking on a bus wide basis, or embedded clocking per bit? The
# decision on the clocking also depends on what can be achieved in the IO
# cell design and IC implementation, delays, deterministic jitter and so
# forth (sidewall capacitance on interconnect is not getting lower and
# neither is mutual inductance).

I think you're looking at a higher protocol level than I am. At the lowest
level, we're defining what a 'transition' is. The next one up or so defines
the relationship between bits and transitions, much as you have with
NRZ, NRZI, and so forth. Similarly, you can define either self-clocking
schemes or source-synchoronous ones.

# At 10:23 AM 1/4/01 -0700, D. C. Sessions wrote:
# >A year ago I tried to start a thread on what a clean-sheet-of-paper
# >signaling standard would look like. Not much response, so I had to
# >wing it. Due to intense demand for short IC-to-IC connections at
# >absurd signaling rates, earlier this month I presented a proposed
# >standard for Scalable Low-Voltage Signaling to JEDEC's JC-16
# >committee on electrical interfaces.
# >
# >A copy of the draft is at http://www.primenet.com/~sessions/SLVS-400.pdf
# >
# >Comments (or at least germane ones) invited.
# >
# >--
# >| The race is not always to the swift, nor the battle to the strong. |
# >| Because the slow, feeble old codgers like me cheat. |
# >+--------------- D. C. Sessions <dcs@lumbercartel.com> --------------+
# >
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-- 
| The race is not always to the swift, nor the battle to the strong. |
| Because the slow, feeble old codgers like me cheat.                |
+--------------- D. C. Sessions <dcs@lumbercartel.com> --------------+

**** To unsubscribe from si-list or si-list-digest: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****


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