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design | Re: GPIB: 24-pin Centronix connectors?
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Re: GPIB: 24-pin Centronix connectors? - Archimedes' Lever - 2008-12-28 11:03:00
On 28 Dec 2008 09:34:37 GMT, Jasen Betts <j...@xnet.co.nz> wrote: >On 2008-12-28, whit3rd <w...@gmail.com> wrote: >> On Dec 27, 4:30 pm, Jasen Betts <ja...@xnet.co.nz> wrote: >>>... I've connected >>> drives as slave on the end of a 80-conductor cable on the secondary >>> IDE port and they work just fine. >> >> Maybe they DO work, but PROPER TERMINATION requires >> the end device be a 'master', and the UDMA documents >> DO specify this. Noise margin is important, and "they work" >> is a very weak statement. > >have you got a link for that? >As far as I can determine AC termination is used at both drives > Standard IDE did not matter. UDMA is twice the data rate, and it DOES MATTER, and the reason is because of reflections.
Re: GPIB: 24-pin Centronix connectors? - Jasen Betts - 2008-12-30 03:13:00
On 2008-12-28, Archimedes' Lever <O...@InfiniteSeries.Org> wrote: > On 28 Dec 2008 09:34:37 GMT, Jasen Betts <j...@xnet.co.nz> wrote: > >>On 2008-12-28, whit3rd <w...@gmail.com> wrote: >>> On Dec 27, 4:30Â pm, Jasen Betts <ja...@xnet.co.nz> wrote: >>>>... I've connected >>>> drives as slave on the end of a 80-conductor cable on the secondary >>>> IDE port and they work just fine. >>> >>> Maybe they DO work, but PROPER TERMINATION requires >>> the end device be a 'master', and the UDMA documents >>> DO specify this. Noise margin is important, and "they work" >>> is a very weak statement. >> >>have you got a link for that? >>As far as I can determine AC termination is used at both drives >> > Standard IDE did not matter. UDMA is twice the data rate, and it DOES > MATTER, and the reason is because of reflections. more made uo shit! go away.