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iAPX
432
Interface
Processor
Architecture
Reference Manual
PS
ADDRESS SPACE
432
ADDRESS SPACE
-r-
--.-.-----
,
~
SOBRANGE
LENGTH
..
p-
I
Transfer
1
Displacement
_ .... _----
1
Initial
Computations
o Adjusted
Object Length = Object Length - Base Displacement
o
Visible
Object Length =
Minimum
(Adjusted Object Length, Byte
Count)
for
block
mode
operation.
o
Visible
Object Length =
Minimum
(Adjusted Object Length,
Subrange
Size)
for
randan
mode
operation.
o
Physical
Base Address = Base Address + Base Displacement
o During block
transfers
in
logical
mode
(window
0
only),
the
h¥te
oount must
be
less
than
the
Visible
Object Length.
o
o
Constraints
During Data
Transfer
Transfer
Displacement must
be
less
than
the
Visible
Object Length
Physical
Base Address +
Transfer
Displacement must
be
less
than
22]1-1
Figure
3-2 Subrange/Window
Attributes
(lDgical
Mode)
3-10
Adjusted
Object
Lenqth