Specifications

EPC-8 Hardware Reference
5 5
5-4
Supported Address Modifiers
The table below lists supported address modifiers:
29h A16 non-privileged
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 5-1. Supported Address Modifiers.
Low-Level Programming “E” Page 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
Example #1 performs a 16-bit read from the VMEbus A16 space.
1. Set the VME E-page enable bit in Register 8102.
2. Determine the correct address modifier for A16 supervisory access (2Dh)
3. The unused address lines A31-A16 will be driven to unspecified levels when not
being used.
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