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SubjectRe: Incorrect UDMA timing on VIA vt82c596b
On Tue, 10 Oct 2000, Vojtech Pavlik wrote:

> > > > Btw, reading the ATA/ATAPI-6 specs I think UDMA66 should work on a
> > > > setup where would be just one drive and a really short, 40-wire cable
> > > > without problems as well. I've even seen systems shipped like that.

On Tue, Oct 10 2000, Mark Hahn wrote:

> > > uh, what part of the spec leads you to that conclusion?
> > > I've haven't seen a draft more recent than ~1h2000, but
> > > they've been unambiguous about absolutely requiring
> > > 80-conductors for >= ata66, and that two-connector cables
> > > must be 5<=l<=18, and three-connector cables 10<=l<=18.

On Tue, 10 Oct 2000, Vojtech Pavlik wrote:

> > ATA/ATAPI-6 draft rev. 0a, page 14 (sheet 28 of 404), table 2, row 4,
> > column 1, plus comment 4 in the same table.
> > And from the engineering point of view, it seems reasonable, too.

On Thu, Oct 12 2000, Andre Hedrick wrote:

> This is the stuff that is not clearly drafted the shews.
> You need the stuff I am forwarding to get the twist.
> Less the kernel list.

"The stuff you're forwarding", doesn't touch the table mentioned by me,
that suggests 66 MB/s operation in a point-to-point, 40-wire setup. It's
not relevant.

--
Vojtech Pavlik
SuSE Labs
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