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iAPX
432
Interface
Processor
Architecture
Reference
Manual
The
I-bit
segment bound
subfield
indicates
whether
or
not
the
associated
fault
was
caused
by
a segment bounds
violation.
A
value
of
zero
indicates
that
the
fault
was
not
caused
by a segment bounds
violation.
A
value
of
one
indicates
that
the
fault
was
caused
by
a
segment bounds
violation.
The
I-bit
menory
overflaY
subfield
indicates
whether
or
not
the
associated
fault
was
caused
by
a
memory
overflow.
A
memory
overflow
occurs
when
the
sum
of
the
physical
base
address
in
bytes
of
a
segment
being
accessed
plus
the
byte
displacement
to
the
operand
being
accessed
exceeds
16,777,215
(i.e.
2**24-1).
A
value
of
zero
irrlicates
that
the
fault
was
not
caused
by a
memory
overflow.
A
value
of
one
indicates
that
the
fault
was
caused
by a mennry
over
flaY.
The
I-bit
access
direction
subfield
indicates
whether
or
not
the
associated
fault
was
caused
bv
an
access
direction
error.
An
access
direction
error
occurs
when
the
transfer
direction
subfield
of
the
corresponding
map
entry
state
irrlicates
that
the
requested
access
di+ection
(either
read
or
write)
is
invalid.
A
value
of
zero
irrlicates
that
the
fault
was
not
caused
by an
access
direction
error.
A
value
of
one
indicates
that
the
fault
was
caused
by
an
access
direction
error.
The
I-bit
post
termination
subfield
indicates
whether
or
not
the
associated
fault
was
caused
by
a
post
termination
error.
A
post
termination
error
occurs
when
an
access
is
attempted
after
a
transfer
via
the
associated
map
entry
has
terminated.
A
value
of
zero
irrlicates
that
the
fault
was
not
caused
by a
post
termination
error.
A
value
of
one
indicates
that
the
fault
was
caused
by a
post
termination
error.
The
I-bit
partial
block
overflaY
subfield
irrlicates
whether
or
not
the
associated
fault
was
caused
by a
partial
block
overflCM. A
partial
block
overflaY
occurs
when
there
is
one
byte
left
to
be
transfered
in
a
block
arrl a
double-byte
request
is
made. A
value
of
zero
indicates
that
the
fault
was
not
caused
by
a
partial
block
overflow.
A
value
of
one
indicates
that
the
fault
was
caused
by a
partial
block
overflCM.
The
I-bit
block
overflaY
subfield
indicates
whether
or
not
the
associated
fault
was
caused
by
a
block
overflow.
A
block
overflow
occurs
when
the
block
count
is
zero,
the
Peripheral
Subsystem
attempts
an
access,
am
the
map
entry
state
has
not
yet
been
updated.
A
value
of
zero
indicates
that
the
fault
was
not
caused
by
a
block
overflow.
A
value
of
one
irrlicates
that
the
fault
was
caused
by
a
block.
over
flaY
•
A-20