HP E1563A, Руководство пользователя, Страница: 123 / 166

HP E1563A and E1564A Register-Based Programming 123 Appendix B
Calibration Flash
ROM Address
Register
This register holds the address of the calibration flash ROM that is used for
storing the calibration constants. Note the bit pattern 01010 for bits 15-11
in the upper byte. A write to Flash ROM is aborted if this pattern is not
present.
Calibration Flash
ROM Data Register
This register holds the data of the calibration flash ROM that is used for the
calibration constants. The upper eight bits return “0” when this register is
read. Note the bit pattern 01010 for bits 15-11 in the upper byte. A write to
Flash ROM is aborted if this pattern is not present.
Calibration Source
Register
The E1564A 4-Channel Digitizer has an on-board calibration source. The
source is a 12-bit DAC with a gain switch. Bit 15 is the gain switch and bits
11 through 0 are the calibration value.
Calibration Source register bits defined:
Cache Count
Register
The total number of samples taken by the digitizer is the ((cache count x 2)
divided by the number of channels) + the sample count (registers
at offset 18
16
and
1A
16
).
base + 1C
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write* 0 1 0 1 0 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
Read** 0 0 0 0 0 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
base + 1E
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write* 0 1 0 1 0 1 0 1 D7 D6 D5 D4 D3 D2 D1 D0
Read** 0 0 0 0 0 0 0 0 D7 D6 D5 D4 D3 D2 D1 D0
base + 20
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write
RANGE
MUX1 MUX0 DAC Data
*WRITE BITS (Calibration Source Register)
bits 0-11 DAC DAC data
bit 12, 13 MUX0, 1 connects choices to the output; 00 = CAL source, 01 = Raw DAC output,
10 = In5V reference, 11 = Input short
bit 15 RANGE DAC output ranges: 0 = ±15V DAC output, 1 = ±0.5V DAC output
base + 22
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write 0 0 0 0 0 0 0 0 Cache count