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Appendix A Address Maps

The VMEbus supports several independent address spaces which have different address

widths — Short addresses are 16 bits wide, Standard are 24 bits and Extended 32. The

addresses which EPICS expects to find the various cards at as set in base/src/drv/

module_types.c are documented here for reference. The addresses are valid for the

Motorola MV167 and all 680X0 chips. See the MV167 manual [5] for more informa-

tion. The tables presented here only show the Gemini standard VME modules described

in this document. All addresses are given in hexadecimal.

1. Short Address Space

The VME Short Address space uses 16 address bits. To access this address space

from the MVME167 card, add 0xFFFF0000 to the short address.

2. Standard Address Space

The VME Standard Address space uses 24 address bits. To access this address space

from the MVME167 card, add 0xF0000000 to the standard address.

3. Extended Address Space

The VME Extended Address space uses 32 address bits. To access this address space

from the MVME167 card, just use the extended address. Some extended VMEbus

addresses cannot be seen by the MC68040 because the MVME167 decodes these

areas for local RAM, I/O devices and the other VME address spaces. The table

below gives the address space viewed from the MC68040; note that there are cur-

rently no standard Gemini EPICS VME modules which map into the extended

space, although several of the modules documented above can be made to do so.

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Motorola MVME167 Bedienungsanleitung Seite 53