File:Endianessmap.svg
From Wikipedia, the free encyclopedia
Full resolution (SVG file, nominally 744 × 1,052 pixels, file size: 13 KB)
 |
This is a file from the Wikimedia Commons. Information from its description page there is shown below. |
Contents |
[edit] Summary
| Description |
English: A tool to use data in little and big endian encodings.
|
| Date | 2007-08-23 (original upload date) |
| Source | Traced from en:Image:Endianessmap.jpg with inkscape, cleaned up with vim. |
| Author | Konrad Eisele |
| Permission (Reusing this file) |
See below. |
[edit] Explanation
Here is an example of using the image:
[edit] Big endian
In Big-Endian: Say you would want to:
- write "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 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
[edit] 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
[edit] Licensing
|
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:53, 18 October 2007 |  | 744 × 1,052 (13 KB) | Slashme | (Traced from en:Image:Endiannessmap.jpg with inkscape, cleaned up with vim.) |
File usage
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on de.wikipedia.org
- Usage on fr.wikipedia.org
