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For detailed PCI memory maps, including suggested CHRP- and
PREP-compatible memory maps, refer to the MVME2600 Series
Single Board Computer ProgrammerÕs Reference Guide (part number
V2600A/PG).
VMEbus Memory Map
The VMEbus is programmable. Like other parts of the
MVME2603/2604 memory map, the mapping of local resources as
viewed by VMEbus masters varies among applications.
The Universe PCI/VME bus bridge ASIC includes a user-
programmable map decoder for the VMEbus-to-local-bus interface.
The address translation capabilities of the Universe enable the
processor to access any range of addresses on the VMEbus.
Recommendations for VMEbus mapping, including suggested
CHRP- and PREP-compatible memory maps, can be found in the
MVME2600 Series Single Board Computer ProgrammerÕs Reference
Guide (part number V2600A/PG). The following figure shows the
overall mapping approach from the standpoint of a VMEbus
master.
Programming Considerations
Good programming practice dictates that only one MPU at a time
have control of the MVME2603/2604 control registers. Of
particular note are:
Registers that modify the address map
Registers that require two cycles to access
VMEbus interrupt request registers
Operating Instructions
2-7
2
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