Test Descriptions
The second group tests
the
HP-IB handshake lines and the
other
HP-IB lines
that
function
in
conjunction
with
the handshake. This group first verifies
that
the controller receives NRFD and NDAC high when no
other
HP-IB devices
are
online,
that
device receives controller's handshake, and
that
device receives REN.
Then
it
verifies
the
combinations of ATN and EOI
that
were not conclusively verified
with
the parallel
poll test.
At
this point, all of the HP-IB interface lines have been tested. The
third
group verifies
that
all of these
lines
can
function harmoniously together
at
full operating speed. Basically, blocks
of
random
data
are
passed
in
each direction between the two PICs, and the
other
control lines
are
exercised frequently.
Step 41.
Bus
Control Lines Test - This test verifies
the
correct operation
of
IFC, SRQ,
and
parallel poll,
which all function independently
of
the
HP-IB handshake.
• IFC test
• SRQ test
Step 42.
Data
Lines Test -
• Data line verification
with
parallel poll response. Tests passive-low assertion of
data
lines, A TN and EOI.
•
A TN
or
EOI high assertion test. Tests
whether
ATN, EOI, or both
can
be asserted high.
Step
43.
Handshake Lines Test - Tests the HP-IB handshake lines DAV, NRFD, and NDAC. These
lines can be individually tested to a limited extent.
Also
tests REN, ATN and EOI.
o NRFD and NDAC passive high test - Verifies
that
setting the device offline causes
NRFD and NDAC to float high, completing any controller handshake.
• NDAC test - Verifies
that
when
the
device
is
online, NDAC
is
low and NRFD
is
bringing
NDAC high.
• NRFD test - Verifies
that
when
the
device
in
FIFO
is
full, NRFD
is
high
so
that
the
byte
written
into controller
out
FIFO will not
go
out
on
the
HP-IB.
oREN
test - Verifies
that
when the controller asserts REN,
the
device goes to REM
at
next
acceptor handshake, and
that
REM goes false when
REN
goes false or
if
IFC goes true.
Step 44.
Data
Modifiers Test - This tests
the
two data modifier lines ATN
and
EOI.
•
Tests not A TN, not EOI, and handshake.
• Tests ATN, not EOI, and handshake.
o Tests not ATN, EOI, and handshake.
SEP 84
3-9
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