AMD SDA3000AI02BA Datový list stáhnout pdf (Strana 96)

84 Appendix B - Conventions and Abbreviations

AMD Sempron™ Processor Model 10 Data Sheet 31993A-1 September 2004

AMD Preliminary Information

Data Terminology

The following list defines data terminology:

■ Quantities

• A word is two bytes (16 bits)

• A doubleword is four bytes (32 bits)

• A quadword is eight bytes (64 bits)

■ Addressing—Memory is addressed as a series of bytes on

eight-byte (64-bit) boundaries in which each byte can be

separately enabled.

■ Abbreviations — The following notation is used for bits and

bytes:

• Kilo (K, as in 4-Kbyte page)

• Mega (M, as in 4 Mbits/sec)

• Giga (G, as in 4 Gbytes of memory space)

See Table 26 on page 85 for more abbreviations.

■ Little-Endian Convention — The byte with the address

xx...xx00 is in the least-significant byte position (little end).

In byte diagrams, bit positions are numbered from right to

left — the little end is on the right and the big end is on the

left. Data structure diagrams in memory show low addresses

at the bottom and high addresses at the top. When data

items are aligned, bit notation on a 64-bit data bus maps

directly to bit notation in 64-bit-wide memory. Because byte

addresses increase from right to left, strings appear in

reverse order when illustrated.

■ Bit Ranges — In text, bit ranges are shown with a dash (for

example, bits 9–1). When accompanied by a signal or bus

name, the highest and lowest bit numbers are contained in

brackets and separated by a colon (for example, AD[31:0]).

■ Bit Values — Bits can either be set to 1 or cleared to 0.

■ Hexadecimal and Binary Numbers — Unless the context

makes interpretation clear, hexadecimal numbers are

followed by an h and binary numbers are followed by a b.

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 102

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AMD SDA3000AI02BA Datový list Strana 96