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Response to Fall of Status/Service-In
A channel may need
to hold up data
transfer temporarily.
It may accomplish this
by raising suppress out
To be effective, suppress
out must rise at least
250 ns prior to the fall
of service out for the
preceding byte
No
Yes
This signal sequence is
Ii
complete. The channel
~\]
now waits for a new initial
selection sequence or a
request for pol I ing
IBM CONFIDENTIAL
No
Yes
No
K9
Operational in must fal l·-prior
to dropping command out to
prevent the status from being
presented again
The channel assumes a
burst-type sequence and
waits for further control-
unit activity
S/360
125
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