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
IIII
I.
III
~-~it
~i~t~al,.lh.?I!~o!~
~d~r:s:-'
IK
KKK
KKK
K T r t t t t t t t
ItUI
15116
17 18
19120
21
22
23124
25 26
27128
29
30
313233
Figure
7.
Generation
of
Actual Addresses Indirect, Virtual Addressing
22
Ma
i n Memory
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