S3C4530A datasheet(28/432 Pages) SAMSUNG

No de pièce	S3C4530A

Description	16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller

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Fabricant	SAMSUNG [Samsung semiconductor]

Site Internet	http://www.samsung.com/Products/Semiconductor

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PROGRAMMER'S MODEL

S3C4530A

2-2

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.

8

4

0

24

31

5

9

15

8

7

0

Word address

8

4

0

9

5

1

10

6

2

11

7

3

Higher address

Lower address

w

Most significant byte is at lowest address

w

Word is addressed by byte address of most signficant byte

Figure 2-1. Big-Endian Addresses of Bytes within Words

NOTE

The data locations in the external memory are different with Figure 2-1 in the S3C4620. Please refer to

the chapter 4, system manager.

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.

Word address

w

Most significant byte is at lowest address

w

Word is addressed by byte address of least signficant byte

8

4

0

24

31

16

23

15

8

7

0

11

7

3

10

6

2

9

5

1

8

4

0

Higher address

Lower address

Figure 2-2. Little-Endian Addresses of Bytes Words

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