Endian Modes
14-2
MPC823e REFERENCE MANUAL
MOTOROLA
ENDIAN MODES
14
The hardware operations that are used to support the different endian modes are:
• Address munging in the core is controlled by the MSR
LE
bit. Refer to the
PowerPC
Microprocessor Family: The Programming Environments for 32-Bit Microprocessors
manual for more information.
• The MPC823e internal bus signal is driven by the master that informs the system
interface unit to swap and perform address demunging or leave the current access as
it is. Table 10-1 defines the DC_CSR
LES
bit for core and cache accesses.
• Address munging and data bytes format in the communication processor module
(CPM) that is controlled by the BO field of the function code register.
Figure 14-1. General MPC823e System Diagram
Note:
Some peripheral component interconnect (PCI) bridge devices cannot be used
in little-endian mode.
CORE
SYSTEM
COMMUNICATION
INTERNAL
I / O DEVICES
SYSTEM
MEMORY
MEMORY
U-BUS E-BUS
PCI
INTERFACE
PCI
DEVICES
MPC823e
PROCESSOR
MODULE
INTERFACE
UNIT
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