HP E1418A manual Card Control Register, A24 Window Value A24 Registers Mapped

Card Control Register

The Card Control Register allows for access to the A24 address space from the A16 address space. It also provides access to the non-volatile memory.

Address

Base + 1E16

Bit	15	14	13	12	11		10	09	08	07	06	05	04	03		02	01	00
READ						Unused							VPPEN		A24 Window
WRITE

VPPEN: Writing a one (1) to this field enables the non-volatile memory to be altered. Writing a zero (0) disables updates or erasures of the non-volatile memory. Non-volatile memory is located at base + 10016 to base + 20016.

Note The VPPEN field enables or disables the programming voltage needed to change the contents of the non-volatile memory. A physical jumper on the main printed circuit board must also be moved to the CAL position before the contents of the non-volatile memory can be altered.

A24 Window: Writing a value to this field sets which 16 register-wide portion of A24 registers can be accessed via A16 registers 2016 to 3E16. The registers mapped for each value are shown below and in Figure B-3 on page 116.

A24 Window Value	A24 Registers Mapped
016	A16 0016 through 1E16
116	A16 2016 through 3E16
216	Main_DAC Immediate Registers
316	Main_DAC Triggered Registers
416	Offset_DAC Registers
516	Gain_DAC Registers
616	Undefined
716	Undefined
816	Voltage Offset Cal Memory (non-volatile)
916	Voltage Gain Cal Memory (non-volatile)
A16	Current Offset Cal Memory (non-volatile)
B16	Current Gain Cal Memory (non-volatile)
C16	Cal and Configuration Registers (non-volatile)
D16	Undefined Cal Memory (non-volatile)
E16	Undefined Cal Memory (non-volatile)
F16	Undefined Cal Memory (non-volatile)

Appendix B HP E1418A Register-Based Programming 137