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Calibration Flash
ROM Address
Register
base + 1C
15
14
16
Write*
0
1
Read**
0
0
Calibration Flash
ROM Data Register
base + 1E
15
14
16
Write*
0
1
Read**
0
0
Calibration Source
Register
base + 20
15
14
16
Write
RANGE
Calibration Source register bits defined:
bits 0-11
DAC
bit 12, 13
MUX0, 1
bit 15
RANGE
Cache Count
Register
base + 22
15
14
16
Write
0
0
Appendix B
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.
13
12
11
10
0
1
0
A10
0
0
0
A10
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.
13
12
11
10
0
1
0
1
0
0
0
0
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.
13
12
11
10
MUX1 MUX0
*WRITE BITS (Calibration Source Register)
DAC data
connects choices to the output; 00 = CAL source, 01 = Raw DAC output,
10 = Internal +5V reference, 11 = Input short
DAC output ranges: 0 = ±15V DAC output, 1 = ±0.5V DAC output
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
and
).
1A
16
13
12
11
10
0
0
0
0
9
8
7
A9
A8
A7
A9
A8
A7
9
8
7
0
1
D7
0
0
D7
9
8
7
9
8
7
0
0
HP E1563A and E1564A Register-Based Programming 123
6
5
4
3
A6
A5
A4
A3
A6
A5
A4
A3
6
5
4
3
D6
D5
D4
D3
D6
D5
D4
D3
6
5
4
3
DAC Data
6
5
4
3
Cache count
2
1
0
A2
A1
A0
A2
A1
A0
2
1
0
D2
D1
D0
D2
D1
D0
2
1
0
at offset 18
16
2
1
0
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