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Metering With The Tps Feature; Reset - IBM 2702 Information Manual

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Off
-----------------------------------------4
ON
CPU
1
IN
SYNC
2712
o
NORM
CARRIER.
ON
PARTITION
CPU 2
lOCAL
WRAP
REMOTE
WRAP
ON
Figure 2
-
5. 2703 Operators Panel
with
TPS and 2712 Feature
"On-
line" means that 2702/03 power is on and the
Meter switch is set to the ON position.
The 2702/03 is performing active work when any
of its lines are under control of any command other
than the Enable or Prepare
commands.
If the 2702/03 Meter switch is changed to the OFF
position while the CPU is not in a halt or wait state,
the
2702/
03 meter continues to run until the CPU is
in a halt or wait state and the 2702/03 is command-
free.
If the CPU is in a halt or wait state and the
2702/03 meter is running as
a
result of another
control unit on the same channel performing
active
work, changing the 2702/03 Meter switch to the OFF
position causes the 2702/03 meter to stop immedi-
ately.
Metering with the TPS Feature
The
Two-
Processor Switch (TPS) feature influences
the operation of the
2702/
03 usage
meter as
follows:
1. The
2702/03
raises Metering In
only
when the
2702
/
03 is attached to one of the two
channels.
2. The 2702/03 usage meter runs when the Metering
Out line from the attached processor is raised.
Table 2-7 defines the operation of the
2702/03
usage meter for the various partition
situations.
This table
assumes
that, for
each situation
(partition-switch setting), the necessary
condi-
tions
are
present
(i.
e., wait state,
command-
free)
.
When the Partition switch is positioned
to OFF, the
associated
CPU is partitioned (cut
off).
3.
The 2702/03 usage meter will
also
run when the
TPS is neutral and the Metering Out lead from
either non-partitioned CPU is active.
NOTES:
.
1.
Metering -In.
Metering-In
is
a line
from
all attached
con
t
rol
units
and is
used to
condition
the
CPU meter
for
operation.
The
Metering-In signal
originat
es from
I
/
O
device
and/or control unit
and
is generated
by the
device from
the
time
of
acceptance
of
a command until
the
generation of
Device End
for that
command.
2. Metering-Out. Metering-Out is a line from
the
channel
t
o
all
att
ached
control
units and is
used t
o conditio
n
all
meters
in
assignable
units
a
nd I
/
O
units. Metering-Out is
raised
w
henever
the
CPU
meter
is
recording
time
.
RESET
The
entire
2702/03 can be reset by one of the follow-
ing
reset
conditions:
1.
A
system reset sequence
given
by the
I/o
channel.
2. A power-on reset.
Operations
2-11

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