S3C2400 View Datasheet(PDF) - Samsung
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S3C2400 Datasheet PDF : 488 Pages
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PROGRAMMER'S MODEL
S3C2400X01 RISC MICROPROCESSOR
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.
Higher Address
31
8
4
0
24 23
9
5
1
16 15
10
6
2
87
11
7
3
Word Address
0
8
4
0
Lower Address
Most significant byte is at lowest address.
Word is addressed by byte address of most significant byte.
Figure 2-1. Big-Endian Addresses of Bytes within Words
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.
Higher Address
31
11
7
3
24 23
10
6
2
16 15
9
5
1
87
8
4
0
Word Address
0
8
4
0
Lower Address
Least significant byte is at lowest address.
Word is addressed by byte address of least significant byte.
Figure 2-2. Little-Endian Addresses of Bytes whthin Words
INSTRUCTION LENGTH
Instructions are either 32 bits long (in ARM state) or 16 bits long (in THUMB state).
Data Types
ARM920T supports byte (8-bit), halfword (16-bit) and word (32-bit) data types. Words must be aligned to four-byte
boundaries and half words to two-byte boundaries.
2-2
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