ARM ARM7TDMI - Figure 2-2 Big-Endian Addresses of Bytes and Halfwords Within Words

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Programmer’s Model

2.3.2 Big-endian

In big-endian format, the ARM7TDMI processor stores the most significant byte of a

word at the lowest-numbered byte, and the least significant byte at the

highest-numbered byte. So the byte at address 0 of the memory system connects to data

lines 31 through 24.

For a word-aligned address A, Figure 2-2 shows how the word at address A, the

halfword at addresses A and A+2, and the bytes at addresses A, A+1, A+2, and A+3

map on to each other when the core is configured as big-endian.

Figure 2-2 Big-endian addresses of bytes and halfwords within words

31 24 23 16 15 8 7 0

Halfword at address A Halfword at address A+2

Word at address A

Byte at address A Byte at address A+1 Byte at address A+2 Byte at address A+3

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