IBM Series 1 User Manual page 214

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Cycle steal request in or
Request in bus of capturing
device (Leading poll ID)
Cycle steal
request in or
Request in bus
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Channel time-out
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of capturing
device
_ \ Do> Other device requests may be present
....
-
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-
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(Lagging poll ID)*
CT4
Poll identifier
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Poll
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Burst return
, CT3
Service sequences
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Last transfer service gate return
r.----~
Timings:
T1
~
100 ns (T1 may be negative)
T2
<
T3
<
100 ns
T4> 100 ns
T5
>
0
CT1 > 180 ns
CT2 > 0
CT3 > 0
CT4> 100 ns
CT5
>
0
Legend:
CT
=
channel times
T
=
attachment controlled times
LVS
=
last valid signal, occurring in time, of a group of
signals being activated on the channel. The group
is linked by short dotted lines on the timing diagram.
LIS last invalid signal, occurring in time, of a group of
signals being deactivated on the channel. The group
*
is linked by short dotted lines on the timing diagram.
cycle steal request in or request in bus of capturing
device is lagging poll ID and did not cause poll ID.
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