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A16/A24 Windows
By using window addressing, you can control the A24 space registers by
mapping them onto the upper 16 of the A16 registers. This allows full
control of the HP E1418A using only A16 addressing. Figure B-3 shows
the A24 mapping into A16 space.
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 140.
Figure B-3. A24 Windowing into the A16 Registers
117
HP E1418A Register-Based Programming
Appendix B
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