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Register Definitions
1
Addressing the
Registers
Appendix B
The RF Multiplexer module is a register based device. See Figure B-1 for register
definitions.
To read or write to specific registers, you must use the command
register address. Complete command register address is determined by:
• The address space (determined by the command module and mainframe
used).
• The module address (determined by the command module used and the
module's logical address switch).
• The register offset (for the desired register).
The following example shows how to address the Status/Control Register of
a RF Multiplexer module in a C-Size Mainframe using a HP E1405/E1406
Command Module.
Register addresses for HP 75000 Series C plug-in modules are in address
space VXI A16. The location of A16 within the HP E1405/06 Command
Module starts at (1F0000
The A16 space is divided so modules are addressed only at locations
beginning with C000 h within A16. Allocated for each module are 64
register addresses (40
address set by the module's logical address switch (LADDR). The module
address is:
module address
For the RF Multiplexer module, the default logical address is 120 (78 h),
thus the module address within A16 =
78
* 40
+ C000
h
h
The Status/Control Register offset is 04 h (from below), thus the command
register address is:
[address space]
1F0000
+ DE00
h
RF Multiplexer Registers
) (
=HEX).
h
h
). The module base address is related to the logical
h
= (logical address
)* 40
h
h
= DE00
h
h
+ [module address]
h
h
+04
= 1FDE04
h
h
h
RF Multiplexer Registers 55
B
+ C000
h
h
+ [register offset]
=
h
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