IBM Series 1 User Manual page 213

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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 of capturing -
device (Lagging poll ID)*
Poll identifier
Poll
Poll return
Service gate
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Channel time-out
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.- " 7"!> Other device requests may be present
T5
Service gate return )
1-) _ _ _ _ _ _ _ _ ---.
t t
Timings:
T1
:s
100 ns (Tl may be negative)
T2
<
T3
<
100 ns
T4
<
lOOns
T5
>
0
CT1 > 180 ns
CT2 > 0
CT3 >0
CT4:; 100 ns+ T4
CT5
>
0
"..11",
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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