Data transfer in big and little endian modes -59, Figure 2-22 shows an – Freescale Semiconductor StarCore SC140 User Manual
Page 91
Memory Interface
SC140 DSP Core Reference Manual
2-59
Figure 2-22. Data Transfer in Big and Little Endian Modes
For single-register moves, assuming an equivalent memory map in big and little endian modes, the byte
organization on the buses is identical in both modes. However, the memory subsystem must route the data
bus bytes to different memory addresses for each supported endian mode.
Big Endian
Little Endian
MOVE.B (A0), D0
MOVE.B (A2), D0
MOVE.W (A8), D0
MOVE.L (A16), D0
xxxx xxxx xxxx xx0a
xxxx xxxx xxxx xx0c
xxxx xxxx xxxx 0102
xxxx xxxx 1122 3344
64-bit XB-BU
S
64
-b
it
XA
-B
US
SC140 Core
Memory
Instructions
Data Bus Contents
8
16 ($10)
24 ($18)
32 ($20)
0
1
2
3
4
5
6
7
0
0a 0b 0c 0d 0e 0f
01 02 03 04 05 06 07 08
11 22 33 44 cc dd ee ff
0
8
16 ($10)
24 ($18)
32 ($20)
7
6
5
4
3
2
1
0
0f 0e 0d 0c 0b 0a
07 08 05 06 03 04 01 02
cc dd ee ff 11 22 33 44