Technical data

Publication No. 980824-118 Rev. A 1260-118/-118A User Manual
Astronics Test Systems Module Operation 3-3
Operating The
1260-118 in
Register-Based
Mode
In register-based mode, the 1260-
118 is operated by directly
writing and reading control registers on the 1260-118 module. The
first control register on the module operates channels 0 through 7.
The second control register operates channels 8 through 15. The
third control register operates channels 16 through 19, etc. When a
control register is written to, all channels controlled by that register
are operated simultaneously.
The control registers are located in the VXIbus A24 Address
Space. The A24 address for a control register depends on:
1. The A24 Address Offset assigned to the 1260-01T module by
the Resource Manager program. The Resource Manager
program is provided by the VXIbus slot-
0 controller vendor.
The A24 Address Offset is placed into the “Offset Register” of
the 1260-01T by the Resource Manager.
2. The <module address> of the 1260-
118 module. This is a
value in the range from 1 and 12 inclusive.
3. The 1260-
118 control register to be written to or read from.
Each control register on the 1260-118 has a unique address.
The base A24 address for the 1260-118 module may be calculated
by:
(A24 Offset of the 1260-01T) + (1024 x Module Address of
1260-118).
The A24 address offset is usually expressed in hexadecimal. A
typical value of 204000
16
is used in the examples that follow.
A 1260-
118 with a module address of 7 would have the base A24
address computed as follows:
Base A24 Address of 1260-118 = 204000
16
+ (400
16
x 7
10
)
= 205C00
16
The control registers for Adapt-a-Switch plug-ins and conventional
1260-Series modules are always on odd-
numbered A24
addresses. The control registers for the 1260-
118 reside at
sequential odd-numbered A24 addresses for the module:
(Base A24 Address of 1260-118) + 1 = Control Register 0
(Base A24 Address of 1260-118) + 3 = Control Register 1
(Base A24 Address of 1260-118) + 5 = Control Register 2
..., and so on.