Conventions - IBM PowerPC 604 User Manual

• PowerPC 603 RISC Microprocessor Technical Summary, Rev 3
MPC603/D (Motorola order number) and MPR603TSU-03 (IBM order number)
• PowerPC 604 RISC Microprocessor Technical Summary, Rev 1
MPC604/D (Motorola order number) and MPR604TSU-02 (IBM order number)
• PowerPC 620 RISC Microprocessor Technical Summary, MPC620/D (Motorola
order number) and MPR620TSU-01 (IBM order number)
Additional literature on PowerPC implementations is being released as new processors
become available.
Conventions
This document uses the following notational conventions:
ACTIVE_HIGH
ACTIVE_LOW
mnemonics
OPERATIONS
italics
OxO
ObO
rA,rB
rAIO
rD
fr A, frB, frC
frD
REG[FIELD]
xxiy
Names for signals that are active high are shown in uppercase text
without an overbar.
A bar over a signal name indicates that the signal is active low-for
example, ARTRY (address retry) and TS (transfer start). Active-low
signals are referred to as asserted (active) when they are low and
negated when they are high. Signals that are not active low, such as
APO-AP3 (address bus parity signals) and TTO-TT4 (transfer type
signals) are referred to as asserted when they are high and negated
when they are low.
Instruction mnemonics are shown in lowercase bold.
Address-only bus operations that are named for the instructions that
generate them are identified in uppercase letters, for example, ICBI,
SYNC, TLBSYNC, and EIEIO operations.
Italics indicate variable command parameters, for example, bcctrx
Prefix to denote hexadecimal number
Prefix to denote binary number
Instruction syntax used to identify a source GPR
The contents of a specified GPR or the value 0.
Instruction syntax used to identify a destination GPR
Instruction syntax used to identify a source FPR
Instruction syntax used to identify a destination FPR
Abbreviations or acronyms for registers are shown in uppercase text.
Specific bits, fields, or ranges appear in brackets. For example,
MSR[LE] refers to the little-endian mode enable bit in the machine
state register.
PowerPC 604 RISC Microprocessor User's Manual