2-14
MPC8240 Integrated Processor User's Manual
MOTOROLA
Programming Model
2
EBA
Enable/disable internal peripheral bus (60x bus) address parity checking
0 Prevents address parity checking
1 Allows a address parity error to cause a checkstop if MSR[ME] = 0 or a machine check
exception if MSR[ME] = 1
EBA and EBD let the processor operate with memory subsystems that do not generate parity.
3
EBD
Enable internal peripheral bus (60x bus) data parity checking
0 Parity checking is disabled.
1 Allows a data parity error to cause a checkstop if MSR[ME] = 0 or a machine check exception
if MSR[ME] = 1
EBA and EBD let the processor operate with memory subsystems that do not generate parity.
4
SBCLK
CKO output enable and clock type selection. When PMCR1[CKO_SEL] = 0, this bit is used in
conjunction with HID0[ECLK] and the hard reset signals to conTgure CKO. See Table 2-2.
5
EICE bit on some other PowerPC devices
This bit is not used in the MPC8240 (and so it is reserved).
6
ECLK
CKO output enable and clock type selection.When PMCR1[CKO_SEL] = 0, this bit is used in
conjunction with HID0[SBCLK] and the hard reset signals to conTgure CKO. See Table 2-2.
7
PAR bit on some other PowerPC devices to disable precharge of ARTRY signal
This bit is not used in the MPC8240 (and so it is reserved).
8
DOZE
Doze mode enable. Operates in conjunction with MSR[POW].
1
0 Processor doze mode disabled.
1 Processor doze mode enabled. Doze mode is invoked by setting MSR[POW] while this bit is
set. In doze mode, the PLL, time base, and snooping remain active.
9
NAP
Nap mode enableOperates in conjunction with MSR[POW]
1
0 Processor nap mode disabled
1 Processor nap mode enabled. Nap mode is invoked by setting MSR[POW] while this bit is set.
When this occurs, the processor indicates that it is ready to enter nap mode. If the peripheral
logic determines that the processor may enter nap mode (no more snooping of the internal
buffers is required), the processor enters nap mode after several processor clocks. In nap
mode, the PLL and the time base remain active.
Note that the MPC8240 asserts the QACK output signal depending on the power-saving state of
the peripheral logic, and not on the power-saving state of the processor core.
10
SLEEP
Sleep mode enableOperates in conjunction with MSR[POW]
1
0 Processor sleep mode disabled.
1 Processor sleep mode enabledSleep mode is invoked by setting MSR[POW] while this bit is
set. When this occurs, the processor indicates that it is ready to enter sleep mode. If the
peripheral logic determines that the processor may enter sleep mode (no more snooping of
the internal buffers is required), the processor enters sleep mode after several processor
clocks. At this point, the system logic may turn off the PLL by Trst conTguring PLL_CFG[0D4]
to PLL bypass mode, and then disabling the internal sys_logic-clk signal.
Note that the MPC8240 asserts the QACK output signal depending on the power-saving state of
the peripheral logic, and not on the power-saving state of the processor core.
11
DPM
Dynamic power management enable
1
0 Processor dynamic power management is disabled.
1 Functional units enter a low-power mode automatically if the unit is idle. This does not affect
operational performance and is transparent to software or any external hardware.
12D14
Reserved
Table 2-1. HID0 Field Descriptions (Continued)
Bits
Name
Description