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In practice, four bits (A24_Window Value) in the A16 Card Control
Register (base + 1E
) control which A24 registers map to the A16 space.
16
For example, if the A24_Window Value is set to 0010, the 16 Main_DAC
Write Immediate Registers are mapped to the A16 space. The Card Control
Register is described in more detail on page 137.
The Base Address
When reading or writing to a module register, a hexadecimal or decimal
register address must be specified. This address consists of a base address
plus a register offset. The base address used in register-based programming
depends on whether the A16 address space is outside or inside the
Agilent E1405/E1406 Command Module.
Figure B-3. A24 Windowing into the A16 Registers
116
Agilent E1418A Register-Based Programming
Appendix B
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