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|From ncrwic.WichitaKS.NCR.COM!!aloisi Thu Jul 13 08:12 MDT 1995
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Date: Thu, 13 Jul 1995 09:54:49 EDT
From: "Paul D. Aloisi 603-429-8687" <aloisi at>
Reply-To: aloisi at
To: hwong at
CC: scsi at
Message-ID: <0099348F.28697D20.25575 at>
Subject: RE: System Deskew Delay ??
Extracted-To: John's_home_for_wayward_email


The deskew times are based on the difference in progation delays. The
table in the ANNEX is followed on the next page with a bus block
diagram that shows the source of each skew. It starts with the receiver,
allows for external transceivers, cable skew, and driver skew.

FAST-20 uses shorter cable and relies on incident wave switching. That is
why active negation drivers are required. This insures the first step
is adequate to guarantee a high state.

ASync operation the skew is to insure that the data is valid before the
clock and each cycle relies on a singal going out and the return signal.

Sync operation is just one going out. High speed operations can have more 
than one transfer on the bus at one time, the data and the clock
are propagating down the cable.

Hope this answers your questions?

Paul Alois

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