Date: Wed, 12 Jul 1995 00:54:23 -0600 From: Warner Losh <imp@village.org> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: dennis@et.htp.com, freebsd-hackers@FreeBSD.org Subject: Re: Wanted: 100bT EISA ethernet recommendation Message-ID: <199507120654.AAA00392@rover.village.org> In-Reply-To: Your message of Tue, 11 Jul 1995 19:51:55 PDT
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While I do not wish to make a correction to this thread, might I suggest that people who are interested in this topic get the excellent books on the topic by MindShare, Inc. I've read through the ISA System Architecture and the EISA System Architecture (at least part of it), and have found the books clear and accurate (well, at least self consistant). I'm not sure if Rod would recommend them, but they seem to be good, and would have cut this thread short since they go into all of this, as well as all the bus cycles, bus arbitration, memory systems, etc. As someone who has traditionally been a little weak on PC hardware, I got lots of useful information from them. >From reading them, I beleive that Rod is correct in his calculations, although they did seem to omit the memory refresh cycles that are stolen at least from the ISA bus (I'm not that far into the EISA book to know), but if I understood and recall correctly, they are << 1% of the bus bandwidth and can safely be ignored. Anyway, if anybody else has seen/read these books and has an opinion, please let me know (and the list, if you think it relevant). On a related note: Is there a good FAQ for this information? And if so, does it include good references for the hardware issues involved? This stuff seems to come up often here and it would be nice to point people that are less than fully informed to such a FAQ. Would save some small amount of bandwidth. Warner
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