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23802E—September 2000 AMD Duron™ Processor Data Sheet

Preliminary Information

Appendix A Conventions, Abbreviations, and References 67

Appendix A

Conventions, Abbreviations,

and References

This section contains information about the conventions and

abbreviations used in this document and a list of related

publications.

Signals and Bits

Active-Low Signals—Signal names containing a pound sign,

such as SFILL#, indicate active-Low signals. They are

asserted in their Low-voltage state and negated in their

High-voltage state. When used in this context, High and

Low are written with an initial upper case letter.

Signal Ranges—In a range of signals, the highest and lowest

signal numbers are contained in brackets and separated by

a colon (for example, D[63:0]).

Reserved Bits and Signals—Signals or bus bits marked

reserved must be driven inactive or left unconnected, as

indicated in the signal descriptions. These bits and signals

are reserved by AMD for future implementations. When

software reads registers with reserved bits, the reserved bits

must be masked. When software writes such registers, it

must first read the register and change only the

non-reserved bits before writing back to the register.

Three-State—In timing diagrams, signal ranges that are

high impedance are shown as a straight horizontal line

half-way between the high and low levels.

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AMD Duron Bedienungsanleitung Seite 79