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Architecture
5
1.2 Notation Used in This Manual
Mathematical notation
• Hexadecimal numbers are expressed as follows (example shown for decimal number 42)
0x2A
• A K(kilo)byte is 2
10
= 1,024 bytes, a M(mega)byte is 2
20
= 1,024 x 1,024 = 1,048,576 bytes, and a
G(giga)byte is 2
30
= 1,024 x 1,024 x 1,024 = 1,073,741,824 bytes.
Data notation
• Byte: 8 bits
• Halfword: 2 contiguous bytes (16 bits)
• Word: 4 contiguous bytes (32 bits)
• Doubleword: 8 contiguous bytes (64 bits)
Signal notation
• Low active signals are indicated by an asterisk (*) at the end of the signal name (e.g.: RESET*).
• Changing a signal to active level is to “assert” a signal, while changing it to a non-active level is to “de-
assert” the signal.