Sun Microelectronics
10
UltraSPARC User’s Manual
In 1994, SPARC International, Inc. published The SPARC Architecture Manual, Ver-
sion 9, which defined a powerful 64-bit enhancement to the SPARC architecture.
SPARC-V9 provided support for:
• 64-bit virtual addresses and 64-bit integer data
• Fault tolerance
• Fast trap handling and context switching
• Big- and little-endian byte orders
UltraSPARC is the first family of SPARC-V9-compliant processors available from
Sun Microsystems, Inc.
How to Use This Book
This book is a companion to The SPARC Architecture Manual, Version 9, which is
available from many technical bookstores or directly from its copyright holder:
SPARC International, Inc.
535 Middlefield Road, Suite 210
Menlo Park, CA 94025
(415) 321-8692
The SPARC Architecture Manual, Version 9 provides a complete description of the
SPARC-V9 architecture. Since SPARC-V9 is an open architecture, many of the im-
plementation decisions have been left to the manufacturers of SPARC-compliant
processors. These “implementation dependencies” are introduced in The SPARC
Architecture Manual, Version 9; they are numbered throughout the body of the text,
and are cross referenced in Appendix C that book.
This book, the UltraSPARC User’s Manual, describes the UltraSPARC-I and
UltraSPARC-II implementations of the SPARC-V9 architecture. It provides specif-
ic information about UltraSPARC processors, including how each SPARC-V9 im-
plementation dependency was resolved. (See Chapter 14, “Implementation
Dependencies,” for specific information.) This manual also describes extensions
to SPARC-V9 that are available (currently) only on UltraSPARC processors.
A great deal of background information and a number of architectural concepts
are not contained in this book. You will find cross references to The SPARC Archi-
tecture Manual, Version 9 located throughout this book. You should have a copy of
that book at hand whenever you are working with the UltraSPARC User’s Manual.
For detailed information about the electrical and mechanical characteristics of the
processor, including pin and pad assignments, consult the UltraSPARC-I Data
Sheet. The “Bibliography” on page 363 describes how to obtain the data sheet.
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