Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!usc!snorkelwacker!spdcc!merk!xylogics!cloud9!jjmhome!m2c!umvlsi!dime!yodaiken From: yodaiken@freal.cs.umass.edu (victor yodaiken) Newsgroups: comp.arch Subject: Re: Futurebus+ @ 500MBytes/sec Message-ID: <7863@dime.cs.umass.edu> Date: 21 Dec 89 15:49:32 GMT References: <276@leia.WV.TEK.COM> <33845@mips.mips.COM> <278@leia.WV.TEK.COM> Sender: news@dime.cs.umass.edu Reply-To: yodaiken@freal.cs.umass.edu (victor yodaiken) Organization: University of Massachusetts, Amherst Lines: 10 In article <278@leia.WV.TEK.COM> johnt@opus.WV.TEK.COM (John Theus) writes: >The high speed data transfer protocol Futurebus+ uses is called packet mode >and it was invented by Emil Hahn of Signetics. This protocol uses source >synchronous transmission without transmitting any clock. Since there is >no clock, there are no bus level set-up or hold times. The protocol is >also not limited by signal skew, which turns out to be the biggest source >of delay in more standard protocols. The bottom line is this protocol will >not be a limiting factor in ultimate performance. How exactly does this work? References?