Filter
Top Products
24 www.xilinx.com PowerPC™ 405 Processor Block Reference Guide
1-800-255-7778 UG018 (v2.0) August 20, 2004
Chapter 1: Introduction to the PowerPC 405 Processor
R
General-Purpose Registers
The processor contains thirty-two 32-bit general-purpose registers (GPRs), identified as r0
through r31. The contents of the GPRs are read from memory using load instructions and
written to memory using store instructions. Computational instructions often read
operands from the GPRs and write their results in GPRs. Other instructions move data
between the GPRs and other registers. GPRs can be accessed by all software.
Figure 1-1: PowerPC 405 Registers
UG018_36_102401
MSR
Machine-State Register
CCR0
Core-Configuration Register
SPR General-Purpose
Registers
SPRG0
SPRG1
SPRG2
SPRG3
SPRG4
SPRG5
SPRG6
SPRG7
Memory-Management
Registers
PID
ZPR
Exception-Handling Registers
EVPR
ESR
DEAR
SRR0
SRR1
SRR2
SRR3
Time-Base Registers
TBU
TBL
PVR
Processor-Version Register
Storage-Attribute Control
Registers
DCCR
DCWR
ICCR
SGR
SLER
SU0R
Debug Registers
DBSR
DBCR0
DBCR1
DAC1
DAC2
DVC1
DVC2
IAC1
IAC2
IAC3
IAC4
ICDBR
Timer Registers
TCR
TSR
PIT
Privileged Registers
Time-Base Registers
(read only)
TBU
TBL
USPRG0
User-SPR General-Purpose
Registers
SPR General-Purpose
Registers
(read only)
SPRG4
SPRG5
SPRG6
SPRG7
General-Purpose Registers
r0
.
.
.
r1
r31
CR
Condition Register
CTR
Count Register
LR
Link Register
XER
Fixed-Point Exception Register
User Registers