Motorola IH5 User Manual
Memory Maps
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Memory Maps
There are three points of view for memory maps:
❏
The mapping of all resources as viewed by the processor (MPU bus
memory map)
memory map)
❏
The mapping of onboard resources as viewed by PCI local bus
masters (PCI bus memory map)
masters (PCI bus memory map)
❏
The mapping of onboard resources as viewed by the CompactPCI
bus.
bus.
The following sections give a general description of the MCPN750A
memory organization from the above three points of view. Detailed
memory maps can be found in the MCPN750A CompactPCI Single Board
Computer Programmer’s Reference Guide (MCPN750A/PG).
memory organization from the above three points of view. Detailed
memory maps can be found in the MCPN750A CompactPCI Single Board
Computer Programmer’s Reference Guide (MCPN750A/PG).
Processor Memory Map
The processor memory map configuration is under the control of the
Raven bridge controller ASIC and the Falcon memory controller chip set.
The Raven and Falcon devices adjust system mapping to suit a given
application via programmable map decoder registers. At system power-up
or reset, a default processor memory map takes over.
Raven bridge controller ASIC and the Falcon memory controller chip set.
The Raven and Falcon devices adjust system mapping to suit a given
application via programmable map decoder registers. At system power-up
or reset, a default processor memory map takes over.
Default Processor Memory Map
The default processor memory map that is valid at power-up or reset
remains in effect until reprogrammed for specific applications. Table 2-1
defines the entire default memory map ($00000000 to $FFFFFFFF).
remains in effect until reprogrammed for specific applications. Table 2-1
defines the entire default memory map ($00000000 to $FFFFFFFF).
Table 2-1. Processor Default View of the Memory Map
Processor Address
Size
Definition
Notes
Start
End
00000000
7FFFFFFF
2GB
Not Mapped
80000000
8001FFFF
128KB
PCI/ISA I/O Space
1
80020000
FEF7FFFF
2GB-16MB-640KB
Not Mapped
FEF80000
FEF8FFFF
64KB
Falcon Registers