Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!sunybcs!boulder!grunwald From: grunwald@foobar.colorado.edu (Dirk Grunwald) Newsgroups: comp.arch Subject: Re: bus on new IBMs Message-ID: <17506@boulder.Colorado.EDU> Date: 28 Feb 90 03:13:16 GMT References: <17449@boulder.Colorado.EDU> <1990Feb26.195128.16857@me.toronto.edu> Sender: news@boulder.Colorado.EDU Reply-To: grunwald@foobar.colorado.edu Organization: University of Colorado at Boulder Lines: 27 In-reply-to: yap@me.utoronto.ca's message of 27 Feb 90 00:51:28 GMT >>>>> On 27 Feb 90 00:51:28 GMT, yap@me.utoronto.ca (Davin Yap) said: DY> grunwald@foobar.colorado.edu (Dirk Grunwald) writes: >Level 3: > --------------------------------- > Addr | AAA | DDD | DDD | DDD | > --------------------------------- > Data | | DDD | DDD | DDD | > --------------------------------- > ^ ^ > +-------+ > 100ns > Two data are ready every 100ns, streaming only DY> The sales rep at the announcement told me that this was their 80 MByte/s DY> mode. True of False? DY> -- could be - but, the 50ns implies 20M-DDD/second. I assume a DDD is 2 bytes? If not, and it's 4 bytes (i.e. 32bit wires), you'd get 80Mb/s, not the 40 I was thinking of. Then, by dropping to 50ns strobes, you'd get 160Mb/s. I think that sounds right. They mumbled something about their optical interface, which was supposedly 200Mb/s, but I don't think it goes through the micro-channel, although it's controlled by the same controller.