From: John Bradford <john@grabjohn.com>
To: alan@lxorguk.ukuu.org.uk (Alan Cox)
Cc: Lionel.Bouton@inet6.fr, Teodor.Iacob@astral.kappa.ro,
linux-kernel@vger.kernel.org
Subject: IDE termination (was Re: UDMA 133 on a 40 pin cable)
Date: Fri, 3 Jan 2003 10:20:31 +0000 (GMT) [thread overview]
Message-ID: <200301031020.h03AKV6N000674@darkstar.example.net> (raw)
In-Reply-To: <1041559076.24830.116.camel@irongate.swansea.linux.org.uk> from "Alan Cox" at Jan 03, 2003 01:57:56 AM
> > I don't think ATA66+ controllers can be within spec if they don't detect
> > 40 vs 80 pin cables.
>
> I wish. Alas not in the real world.
Something that occurs to me, which is somewhat related to this:
My understanding, (which might be wrong) is that termination of the
IDE bus is partly handled by each connected devicem rather like modern
floppy drives, (in contrast to SCSI, 10-base-2, old floppy drives etc,
where the termination is handled by devices at the physical ends of
the cable).
So if you connnect a really old IDE disk, say a 20 Mb one, and an
ATA-100 one to the same bus, is the termination then out of spec,
(analogous to using passive terminators on anything other than a SCSI-1
bus), because presumably the termination requirements are stricter for
the higher bus speed and signaling on both edges?
Just wondered.
John.
next prev parent reply other threads:[~2003-01-03 10:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-02 18:29 UDMA 133 on a 40 pin cable Teodor Iacob
2003-01-02 19:37 ` Alan Cox
2003-01-02 18:59 ` Teodor Iacob
2003-01-02 19:21 ` Samuel Flory
2003-01-02 19:23 ` Teodor Iacob
2003-01-02 19:47 ` Samuel Flory
2003-01-02 20:37 ` Teodor Iacob
2003-01-03 2:26 ` Joshua Stewart
2003-01-02 22:00 ` Lionel Bouton
2003-01-02 22:40 ` Ross Biro
2003-01-02 22:42 ` Teodor Iacob
2003-01-03 1:04 ` Lionel Bouton
2003-01-03 1:57 ` Alan Cox
2003-01-03 10:20 ` John Bradford [this message]
2003-01-03 10:29 ` IDE termination (was Re: UDMA 133 on a 40 pin cable) Andre Hedrick
2003-01-02 23:24 ` UDMA 133 on a 40 pin cable Alan Cox
2003-01-02 22:45 ` Ross Biro
2003-01-03 1:15 ` Lionel Bouton
2003-01-03 16:14 ` Vojtech Pavlik
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