HP E1340A, Руководство пользователя

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The Query
Response Register
When the AFG’s configuration (e.g. function, frequency,
…
) is queried, the
response is sent to the Query Response Register.
Address 15 - 8 7 6 5 4 3 2 1 0
base + 08
16
not used Query Response
Query Response. The response returned to the register is the contents of an
AFG memory location containing information about the queried parameter.
Responses are 16-bits, of which only the lower eight bits are used. See the
“ Example Programs” section for more information.
The WRITE
Registers
The following WRITE registers are located on the AFG.
•
Control Register (base + 04
16
)
•
Command Register (base + 08
16
)
•
Parameter Register (base + 0A
16
)
•
Input Data Register (base + 0C
16
)
Examples and program statements in this appendix use 16-bit writes. Except
for the Input Data Register, the WRITE registers only use the lower eight
bits.
The Control
Register
The Control Register is used to perform a hardware reset of the AFG and to
disable the AFG from driving the SYSFAIL line.
Address 15 - 8 7 6 5 4 3 2 1 0
base + 04
16
Not Used X X X X X X SYSFAIL
Inhibit
Reset
Resetting the AFG. Writing a one (1) to bit 0 (hardware) resets the AFG.
Writing a zero (0) turns the reset function off. Bit 0 must be a "1" for at least
2
µ
s for the reset to occur. If bit 0 remains a 1, the AFG continually resets.
Inhibiting SYSFAIL. Writing a one (1) to bit 1 prevents the AFG from
driving the SYSFAIL line. Writing a zero (0) allows the AFG to drive
SYSFAIL during a reset.
Every program (except "Querying AFG Parameters") in the “ Programming
Examples” section begins by resetting the AFG.
Appendix C HP E1340A Register-Based Programming 237