s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 28

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

PROGRAMMER'S MODEL
BIG-ENDIAN FORMAT
In Big-Endian format, the most significant byte of a word is stored at the lowest numbered byte and the least
significant byte at the highest numbered byte. Byte 0 of the memory system is therefore connected to data lines
31 through 24.
LITTLE-ENDIAN FORMAT
In Little-Endian format, the lowest numbered byte in a word is considered the word s least significant byte, and
the highest numbered byte the most significant. Byte 0 of the memory system is therefore connected to data lines
7 through 0.
2-2
The data locations in the external memory are different with Figure 2-1 in the S3C4620. Please refer to
the chapter 4, system manager.
Higher address
Lower address
Higher address
Lower address
31
24
M
M
Figure 2-1. Big-Endian Addresses of Bytes within Words
31
24
M
M
Figure 2-2. Little-Endian Addresses of Bytes Words
Most significant byte is at lowest address
Word is addressed by byte address of least signficant byte
11
7
3
Most significant byte is at lowest address
Word is addressed by byte address of most signficant byte
8
4
0
23
16
9
5
10
6
2
9
5
1
NOTE
15
15
9
5
1
10
6
2
8 7
8 7
8
4
0
11
7
3
0
0
8
4
0
Word address
8
4
0
Word address
S3C4510B