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iAPx 432
Interface
Processor
Architecture
Reference
Manual
The
IP
records
fault
information
in
various
areas
of
IP
process
and
processor
objects
(refer
to
Appendix A
for
detailed
description
of
these
fault
information
areas).
There
are
three
categories
of
IP
operation
in
which
faults
may
be
generated:
physical
reference
node,
logical
reference
node,
and window-mapped
data
transfer.
Each
of
these
modes
utilizes
specific
fault
information
areas
to
report
faults.
PHYSICAL
mOE
Information
about
faults
which
occur
in
physical
reference
node
is
recorded
in
the
processor
fault
infoDmatian
area
of
the
IP
processor
obj
ect.
The
function
state
is
set
to
"context-level
faul
t"
when
a
physical
reference
mode
fault
is
encountered
am
an
AP
interrupt
is
generated.
LOOICAL
moE
Information
about
faults
which
occur
in
logical
reference
node
is
recorded
in
awropr
iate
portions
of
the
IP
process
and
processor
objects.
Each
IP
process
object
contains
two
fault
information
areas:
one
for
context-level
fault
information
and one
for
process-level
fault
information.
The
IP
processor
object
contains
a
fault
informations
area
for
processor-level
fault
information.
Depending
on
the
severity
level
(context,
process,
or
processor)
of
a
fault
and
the
current
state
of
the
process
and
processor,
an
IP
selects
an
area
to
be
used
to
record
the
fault
information.
The
method an
IP
uses
to
decide
the
appropriate
site
to
record
fault
information
is
shown
in
Figure
6-1.
Successive
faults,
encountered
during
fault
recording,
reflect
the
fault
state
to
higher
levels
of
severity
until,
finally,
an
IP
can
no
longer
continue
and must
issue
the
FATAL
signal
(see
iAPX
432
VISI
Interface
Processor
Oata
Sheet,
Order
Number
171874).
CATEX;()RIES
OF
LOOICAL
mOE
FAULTS
There
are
three
categories
of
logical
node
faults,
listed
in
increasing
order
of
severity:
o
Context-level
faults
o
Process-level
faults
o
Processor-level
faults
6-2