Xycom XVME-560, Manual

Page: 16 / 70

XVME-560 Manuai
September, 1984
2.4.2 Address Space Selection
The user is given the option of placing the AIN in VMEbus Short I/O or Standard
Memory Space. The selection is made by configuring jumper J2 and Switch 8 of Switch
Bank 2 (see Figure 2-2) as shown in Table 2-3 below.
Table 2-3. Addressing Options
Jumper Switch 8 Option Selected
J2A
Open
Standard Data Access Operation
J2B
Closed Short
I/O
Access Operation
If jumper J2A is
installed,
Switch 8 must be set to open.
If jumper J2B is installed, Switch 8 must be set to closed.
The Standard I/O Architecture recommends that the AIN operate within the Short I/O
Address Space, in order to take advantage
of the
Standard I/O Architecture’s various
features, which are described in Appendix A.
If required, the AIN can operate in the Standard Address Space. The user
should note
that in this mode, the AIN will always reside within the last 64K byte segment of the
Standard Memory Address Space (i.e.,
the
address range FFOOOOH through FFFFFFH).
SUPERVISOR/
NON-PRIVILEGED
BASE ADDRESS
A D D R E S S S P A C E
1 2
6 7 8
O P E N
SELECTION
Figure 2-2. Switch Bank Two