2-8
Computer Group Literature Center Web Site
Operating Instructions
2
The following table shows which devices are affected by the various types
of resets. For details on using resets, refer to the MCP750 Series Single
Board Computer Programmer’s Reference Guide (MCP750A/PG).
Endian Issues
The MCP750 supports both little-endian and big-endian software. The
PowerPC is inherently big-endian, while the PCI bus is inherently little-
endian. The following sections summarize how the MCP750 handles
software and hardware differences in big- and little-endian operations. For
further details on endian considerations, refer to the MCP750 Series Single
Board Computer Programmer’s Reference Guide (MCP750A/PG).
Processor/Memory Domain
The MPC750 processor can operate in both big-endian and little-endian
mode. However, it always treats the external processor/memory bus as big-
endian by performing address rearrangement and reordering when
Table 2-3. Classes of Reset and Effectiveness
Device Affected
Processor
Raven
ASIC
Falcon
Chip
Set
PCI
Devices
ISA
Devices
Compact
PCI
Busses
Reset Source
Power-
On/undervoltage
√
√
√
√
√
√
Front Panel Reset
switch
√
√
√
√
√
√
Watchdog Timer
reset
√
√
√
√
√
√
S/W Hard Reset
(PBC Port 92
Register)
√
√
√
√
√
√
CompactPCI Reset
(21154 BCR)
√
