You would take the parts of the diagram for 32 bit and Big-Endian:
Value in register:
81234561
A B C D
Register:
|------->
A B C D 32 bit access
Memory:
| A B C D 32 bit access address 0
---------
0 1 2 3
^
|-> map 0 here
A B C D
Result in memory:
| 12345678
---------
0 1 2 3
Now you would want to read back 16 bit from address "2" in Big-Endian: Then you would use:
Value in memory:
| 12345678
---------
0 1 2 3
Memory:
| A B C D 16 bit access 2
---------
0 1 2 3
^
|-> map 2 here
|--->
C D
Register:
|-->|
A B C D 16 bit access
Result in register:
| 00005678
---------
0 1 2 3
Little endian
In Little-Endian: Say you would want to :
write your "0x12345678" 32 bit into memory at addr "0"
read back 16 bit from address "2"
You would take the parts of the diagram for 32 bit and Little-Endian:
Value in register:
12345678
A B C D
Register:
A B C D 32 bit access
<-------
Memory:
A B C D | 32 bit access 0
---------
3 2 1 0
^
<-| map 0 here
A B C D
Result in memory:
12345678|
---------
3 2 1 0
Now you would want to read back 16 bit from address "2" in Little-Endian: Then you would use:
Value in memory:
12345678 |
-----------
3 2 1 0
Memory:
A B C D | 32 bit access address 2
---------
3 2 1 0
^
<-| map 2 here
C D
Register:
A B C D 16 bit access
|<--|
Result in register:
00001234
---------
3 2 1 0
Licensing
Konrad Eisele, the copyright holder of this work, hereby publishes it under the following licenses:
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This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.