Address Space Selection; Supervisory/Non-Privileged Mode Selection; Address Modifier Reference - Xycom XVME-212 Manual

XVME-2 12 Manual
August, 1989
2.4.2 Address Space Selection (J3)
The XVME-212 may be placed in VMEbus Short I/O or Standard Memory Space. The
selection is made by configuring Jumper J3 and Switch 8 of Switch Bank Sl (see Figure
2-2) as shown in Table 2-3 below.
Jumper
J3A
J3B
If Jumper J3A is installed, Switch 8 (on Switch bank Sl) must be set to OPEN.
If Jumper J3B is installed, Switch 8 must be set to CLOSED.
The Standard I/O Architecture recommends that the XVME-212 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
If required, the XVME-212
mode, the XVME-212 will always reside within the upper 64 Kbyte segment of the
Standard Memory Address Space (i.e., the address range FF0000H through FFFFFFH). Sl
switches 1 through 6, then determines which 1K block of the upper 64 Kbyte segment is
to be occupied.
2.4.3

Supervisory/Non-Privileged Mode Selection

The XVME-212 can be configured to respond only to supervisory access, or to both non-
privileged and supervisory accesses, by selecting the position of Switch 7 (located in
Switch Bank Sl, see Figure 2-2), as shown in Table 2-4 below.
Switch 7
Closed
Open

Address Modifier Reference

2.4.4
Table 2-5 below indicates the actual VMEbus Address Modifier code that the XVME-212
will respond to, based on the position of the options discussed in the previous two
sections.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Table 2-3. Addressing Options (J3)
Switch 8 (Sl)
Open
Closed
can operate in the Standard Address Space. Note that in this
Table 2-4. Privilege Options
Privilege Mode Selected
Supervisory or Non-privileged
Supervisory Only
Option Selected
Standard Data Access Operation
Short I/O Access Operation
A.
2-7
.