XVME-530 Manual
October, 1984
case
D/A circuitry),
a
VMEbus module
is
complete. The Non-Intelligent Kernel has the
following features:
0
Control and Address Buffers
0
Address Decode circuitry
0
Control/Status Register
0
Module identification information
0
Pass
and
Fail
LED
indicators
The XYCOM Non-Intelligent Kernel
is
described in further detail in Appendix A.
1.3.2
Application Circuitry
As Figure
1-1
shows, the application circuitry consists primarily of the following:
0
0
0
0
0
8
D/A converters which perform 12-bit resolution D/A conversions
Data latch to store the digital data
to
be converted
to
analog
Channel latch
to
select the output channel over which the data will be
output
Optical isolator
to
isolate between the digital and analog circutry
Timing controller to transfer digital information across the optical isola-
tion boundary
to
the
D/Afs
1.4
FEATURES
OF
XYCOM'S
STANDARD
I/O
ARCHITECTURE
The
AOUT
and all XYCOM
1/0
modules conform
to
the unique XYCOM VMEbus
Standard I/O Architecture. This architecture
is
intended to make the programming of
XYCOM VMEbus
1/0
modules simple and consistent. The following features apply to
the operation
of
the AOUT.
0
Module Address Space
-
The AOUT and all VMEbus modules
are
controlled
by writing
to
addresses within the 64K Short 1/0 Address space. A VMEbus
module can be jumpered
to
occupy any of the 64 available
1K
blocks.
This block, known
as
the
1/0
Interface Block, contains
all
of
the module's
programming registers, and ID data. Within the 1/0 Interface Block, the
offsets are standardized
so
that the user may expect
to
find the same
registers and data
at
the same offsets across the entire XYCOM VMEbus
line.
Module Identification
-
The AOUT has I.D. information which provides
its
name, model number, manufacturer and revision level
at
a
location that is
consistent with other XYCOM 1/0 modules.
0
Status/Control Register
-
This re ister
is
always located
at
address
Base+81H, and the lower four bits
7
two Test Status bits, and
a
red and
green LED bit) are standard from module to module.
0
A detailed description of XYCOM
1/0
Architecture
is
presented in Appendix A
at
the
rear
of
this manual.
1-3
