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2
VMIVME-2533 Differential Digital Ouput Board
Address Modifiers
The VMIVME-2533 Board is configured at the factory to respond to short
nonprivileged I/O access, (jumper AM2 installed). This can be changed by installing
the AM2 jumpers to fit the need. There are two AM2 jumpers, one is for the data
register's base address (jumper JD) and the other is for the CSR (jumper JC). There are
also three possible selections for each of the AM2 jumpers. Figure 5.4-1 shows the
three possible selections for AM2. Figure 2-2 below (a) shows the AM2 jumper for
nonprivileged short I/O accesses only, while Figure 2-2 (b) shows the AM2 jumper
set-up for either I/O access type. In this mode the data registers and/or the CSR will
acknowledge either I/O access (short supervisory or non-privileged).
Figure 2-2
Address Modifier Positions
JC
JD
A
B
C
A
B
C
CSR
DATA
a. AM2 Jumpered for Short Nonprivileged I/O Access.
JC
JD
A
B
C
A
B
C
CSR
DATA
JC
JD
A
B
C
A
B
C
CSR
DATA
c. AM2 Jumpered for Short Supervisory Access (no jumpers installed)
b. AM2 Jumpered for Either I/O Access.
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