Xycom XVME-560 Manual page 44

XVME-560 Manual
September, 1984
base addresses in 1K (400H) increments.
Al0-A13 are
signals
the lowest 16 of the possible 64
XVME
non-intelligent
decoded, while the remaining lower order bits are ignored. This arrangement provides
the correct address configuration to allow each module address to begin on a 1K
boundary. Non--intelligent XVME modules allow the use of six base address jumpers
(representing bits
boundaries available in the short I/O address space.
only allow the use of four base address jumpers (representing bits Al0-A15) which
limits their selection of 1K boundaries to one of 16 possible choices.
Figure A-l shows an abbreviated view of the short I/O memory.
Al4 and A15
decoded, while
1K
modules, the six highest order short
Al0-A15),
and thus, they are able to reside on any of the 64
B A S E
FCOOH
Figure A-1. 64K Short I/O Address Space
On an intelligent
must be zero. (This implies that only
segments are used for intelligent modules.) On
Intelligent XVME modules will
short I/O
Address Space
0
2
3
4
63
A-2
XVME
module, address
I/O
address bits are
1K