Fluke 9000A-Z80QT, Instruction Manual

Page: 25 / 108

ZBOQT
3-10.
LINES ENABLED
DURING MAINFRAME SETUP
During
setup
of
the mainframe, the
operator
has the option
of
enabling or not
enabling certain forcing lines
as
a means of preventing UUT faults from
disabling the pod microprocessor.
For
the 280, these lines include BUSRQ and
WAIT. Also during mainframe setup, the
operator
may elect
to report
(trap) or
disregard active signals on the forcing lines.
Reporting active forcing
lines
halts
mainframe operation
in
order to display the forcing line message.
3-11.
NON-DETECTABLE
280
SIGNALS
The pod does
not detect the absence
of
the
m
signal. However, this signal can
be observed, if necessary, by using the probe
or
scope trigger output
of
the
mainframe to
trigger a scope. (Figure 4-4 shows the mainframe scope trigger
output signal.)
3-12. QUICK-LOOPING READ
AND
WRITE FUNCTIONS
The Z80QT
Pod
provides Quick-Looping read and write functions with
repetition rates considerably
fasterthan
ordinary mainframe
looping
functions
selected by pressing the LOOP key. Because
of their
increased repetition rate,
Quick-Looping functions are particularly useful
for
enhanced viewing of signal
traces on an oscilloscope synchronized to the
TRIGGER OUTPUT
pulse
(available on the rear panel of the mainframe).
Unlike
ordinary
mainframe looping functions, software
that
controls Quick-
Loopingfunctions
resides in the pod and not in the mainframe.
Instructions
for
using the Quick—Loopingread and write functions
of
the pod
for
the
9000
and
9100 Series mainframes are presented separately under the next headings.
It should
be
noted that
diagnostics performed by the pod during
execution of
Quick-Looping read
or
write
operations
are less rigorous
than
diagnostics
performedduring
execution
of
the ordinary looping function. The pod reports
to the mainframe any UUT system errors detected during the first iteration only.
Subsequent UUT system errors are
not
reported.
If both errorreporting and Quick-Looping functions are desired, you may apply
the ordinary mainframe looping function to the Quick—Loopingread or write,
such as READ
@ 10
2000
LOOP
in the case
of
the 9000 Series. The mainframe
commands
read operationsat
address
10
2000 at the normal looping
speed with
full
error
reporting.
For
every
ordinary read operation, the pod interjects a
few
Quick—Looping
read operations (with no error
reporting) to enhance oscilloscope
v1ew1ng.