Date: Mon, 08 Dec 1997 01:21:06 GMT From: stevebr@primenet.com (Steve Brueggeman) To: gibbs@narnia.plutotech.com (Justin T. Gibbs) Cc: aic7xxx@FreeBSD.org Subject: Re: does aha2940UW work with Seagate LVD disks? Message-ID: <348b485f.8538803@pop.primenet.com> In-Reply-To: <199712052148.OAA27749@narnia.plutotech.com> References: <199712021749.PAA05341@hoggar.fisica.ufpr.br> <348622ea.343750@pop.primenet.com> <199712052148.OAA27749@narnia.plutotech.com>
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If the drives are in single ended mode, and they are asked to negotiate to 40Mhz, they will respond back with MSGIN for 20Mhz. > >> But, Single Ended mode does not support 40Mhz transfers (80MB/sec on a wide >> interface). Single Ended mode only supports Ultra-1 (20Mhz or 40MB/sec on >> wide interfaces). To get 40Mhz transfers, you need a host adapter that has >> LVD drivers. > >Single Ended mode will support 40MHz transfers, but the cable length must >be so short that you would only be able to put one or two devices on the >bus. I do not know if the devices will be so annoying as to not negotiate >40MHz if you ask for it and diffsense is false. I certainly hope not, as >there are certainly systems that are single target/single initiator where >cable length is not a problem, but the number of signals wires is.
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