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iAPX
432
Interface
Processor
Architecture
Reference
Manual
current
status
information.
When
operands
are
read
from
this
subr
ange
or
wr
i
tten
into
this
subr
ange,
the
processor
data
segment
is
accessed.
Data
written
into
the
part
of
the
subrange
representing
the
function
request
facility
is
captured
when
no
function
is
in
progress.
During
function
execution,
Attached
Processor
software
must
not
make
further
function
requests.
At
the
base
of
the
mapping
facility
area,
the
extra
information
for
supporting
block
transfer
via
map
entry
0
is
recorded
in
a
data
structure
with
the
following
organization.
= = double
byte
1----------------1
displacement
1
reserved
1
31
1----------------1
P.
S.
disp.
1
1----------------1
1
432
disp.
1
1----------------1
block
count
28
1----------------1
=
=
When
the
transfer
m:x1e
subfield
of
the
entry
state
field
for
map
entry
0
indicates
that
it
is
in
block
transfer
mode,
the
processor-resident
copy
of
the
block
count
field
indicates
the
number
of
bytes
remaining
to
be
transferred
for
transfer
termination
to
occur normally
(i.
e.
, upon
count
runout).
Whenever normal
transfer
termination
occurs,
both
copies
of
the
block
count
field
are
zero.
Whenever normal
transfer
termination
does
not
occur,
such
as
in
the
case
of
faults,
both
copies
of
the
block
count
field
indicate
the
number
of
remaining,
but
not
transferred,
bytes.
When
the
transfer
mode
subfield
of
the
entry
state
field
for
map
entry
0
indicates
that
it
is
in
block
tr
ansfer
m:x1e,
the
processor-resident
copy
of
the
432
displacement
field
indicates
the
displacement
into
the
associated
data
segment
of
the
next
byte
to
be
transferred.
When
the
transfer
node
subfield
of
the
entry
state
field
for
map
entry
0
indicates
that
it
is
in
block
transfer
mode,
the
processor-resident
copy
of
the
Peripheral
Subsystem
displacement
field
indic~tes
the
displacement
into
the
associated
Peripheral
Subsystem
address
range
of
the
next
byte
to
be
transferred.
Any
difference
between
the
values
of
the
tYfO
displacement
fields
accounts
for
data
in
the
processor-resident
buffers
which was
not
successfully
transfered.
A-16