Processor Initialization
3-5
POW
Power management enable. Setting this bit enables the programmable
power management modes: nap, doze, or sleep. These modes are
selected in the HID0 register. This bit has no effect on dynamic power
management.
ILE
Exception little-endian mode.
EE
External interrupt enable. This bit allows the processor to take an exter-
nal interrupt, system management interrupt, or decrementer interrupt.
PR
Privilege level.
0= user- and supervisor-level instructions are executed
1= only user-level instructions are executed
FP
Allows the execution of floating-point instructions. This bit is set on ini-
tial power-up.
ME
Machine check enable. Machine checking is enabled initially on the
BajaPPC-750.
FE0/FE1
These bits define the floating-point exception mode.
Table 3-3. IEEE Floating-Point Exception Modes
FE0
FE1
FP Exception Mode
0
0
Disabled
0
1
Imprecise nonrecoverable
1
0
Imprecise recoverable
1
1
Precise
SE/BE
Single-step and branch trace enables.
IP
Exception prefix. Initially, this bit is cleared so that the exception vector
table is placed at the base of RAM (0000,0000
16
). When this bit is set, the
vector table is placed at the base of ROM (FFF0,0000
16
).
IR/DR
Instruction and data address translation enables.
RI
Recoverable exception enable for system reset and machine check. This
feature is enabled on initial power-up.
LE
Little-endian mode enable. On the BajaPPC-750, this bit must set to zero
so that the processor always runs in big-endian mode.
Содержание BajaPPC-750
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