
EPC-7 Hardware Reference
Supported Address Modifiers
7
7
2Dh
A16
supervisor
39h
A24 non-privileged data
3Ah
A24 non-privileged program
3Dh
A24 supervisor data
3Eh
A24 supervisor program
09h
A32 non-privileged data
0Ah
A32 non-privileged program
0Dh
A32 supervisor data
0Eh
A32 supervisor program
Table 17. Supported Address Modifiers.
Low-Level Programming the VMEbus Interface
It is recommended that rather than performing accesses in this low-level hardware de-
pendent form, the BusManager component of the EPConnect software package be
used instead.
VMEbus Accesses
Two examples are given here including both a verbal description and the Microsoft C
source code for performing VMEbus accesses through the "E" page.
Example #1 performs a 16-bit read from the VMEbus A16 space.
1. Set the EVME access bit in Register 8102.
2. Determine the correct address modifier for A16 supervisory access (2Dh)
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