Xilinx Virtex-II Pro PPC405, User Manual

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312 www.xilinx.com March 2002 Release
1-800-255-7778 Virtex-II Pro™ Platform FPGA Documentation
Preface
R
and the requirements for initializing the processor.
• Chapter 11,
Instruction Set
, provides a detailed description of each instruction
supported by the PPC405.
• Appendix A, Register Summary , is a reference of all registers supported by the
PPC405.
• Appendix B,
Instruction Summary
, lists all instructions sorted by mnemonic, opcode,
function, and form. Each entry for an instruction shows its complete encoding.
General instruction-set information is also provided.
• Appendix C, Simplified Mnemonics , lists the simplified mnemonics recognized by
many PowerPC assemblers. These mnemonics provide a shorthand means of
specifying frequently-used instruction encodings and can greatly improve assembler
code readability.
• Appendix D,
Programming Considerations
, provides information on improving
performance of software written for the PPC405.
• Appendix E, PowerPC
®
6xx/7xx Compatibility , describes the programming model
differences between the PPC405 and PowerPC 6xx and 7xx series processors.
• Appendix F, PowerPC
®
Book-E Compatibility , describes the programming model
differences between the PPC405 and PowerPC Book-E processors.
Document Conventions
General Conventions
Table 1 lists the general notational conventions used throughout this document.
Table P-1: General Notational Conventions
Convention Definition
mnemonic Instruction mnemonics are shown in lower-case bold.
. (period) Update. When used as a character in an instruction
mnemonic, a period (.) means that the instruction
updates the condition-register field.
! (exclamation) In instruction listings, an exclamation (!) indicates the
start of a comment.
variable Variable items are shown in italic.
<optional> Optional items are shown in angle brackets.
ActiveLow An overbar indicates an active-low signal.
n A decimal number.
0x n A hexadecimal number.
0b n A binary number.
( r n ) The contents of GPR r n.
( r A|0) The contents of the register r A, or 0 if the r A instruction
field is 0.
cr_bit Used in simplified mnemonics to specify a CR-bit
position (0 to 31) used as an operand.