Instruction in memory:
Instruction
in
instruction registers:
The 8
high-order
bits
of
the
reference
address
are
replaced
with
ll-bit
page
address Z from memory map:
Actual
address
of
memory
location
that
contains
the
direct
address:
17-bit
direct
address in memory:
Indi
rect
addressing
replaces
reference
address
with
direct
address:
Halfword
operation
indexing
alignment:
Effective virtual address:
The 8
high-order
bits
of
the
effective
address
are
replaced
with
ll-bit
page
address N from memory map:
Final memory address, which is
the
actual
address
of
halfword
location
containing
the
effective
halfword:
\.
,-------~·------~'r~------~~~----~
22-bit
actual
address
III
III
I
II
I
1119-bit
virtual1halfword address I
l,
I...
l,
I
...
I
...
I
...
I,
I,
, , , , " , , ,
£"
I"
"
"""
"r\."
I I I I I I I I I I
VI
15116
17 18
19120
2122
2312425
26
27128
29
30
31
1
3233
,
...
o 1 2 3 4 5
...
I
1 I
Figure
7.
Generation
of
Actual
Addresses
Indirect,
Virtual Addressing
22 Main Memory
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