Agilent Technologies E8462A Manual do Utilizador Página 133

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Register-Based Programming 131
A16 Address Space
Inside the Command
Module or Mainframe
When the A16 address space is inside the Agilent E1406A Command
module (Figure B-2), the multiplexer's base address is computed as:
1FC000
h
+ (LADDR * 64)
h
or (decimal)
2,080,768 + (LADDR * 64)
where 1FC000
h
(2,080,768) is the starting location of the VXI A16
addresses, LADDR is the multiplexer's logical address, and 64 is the number
of address bytes per register-based device. Again, the multiplexer's factory
set logical address is 112. If this address is not changed, the multiplexer will
have a base address of:
1FC000
h
+ (112 * 64)
h
= 1FC000
h
+ 1C00
h
= 1FDC00
h
or (decimal)
2,080,768 + (112 * 64) = 2,080,768 + 1536 = 2,087,936
Figure B-2. Registers within Command Module's A16 Address Space
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