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68 Conventions, Abbreviations, and References Appendix A
AMD Duron Processor Data Sheet 23802ESeptember 2000
Preliminary Information
Invalid and Dont-CareIn timing diagrams, signal ranges
that are invalid or don't-care are filled with a screen
pattern.
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)
AddressingMemory is addressed as a series of bytes on
eight-byte (64-bit) boundaries in which each byte can be
separately enabled.
AbbreviationsThe 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 23 for more abbreviations.
Little-Endian ConventionThe 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
leftthe 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 RangesIn text, bit ranges are shown with a dash (for
example, bits 91). 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 ValuesBits can either be set to 1 or cleared to 0.
Hexadecimal and Binary NumbersUnless the context
makes interpretation clear, hexadecimal numbers are
followed by an h and binary numbers are followed by a b.
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