User Manual
AIC 324
+13
R\W
Upper address of DAC buffer
Bit #
7
6
5
4
3
2
1
0
Name
x
x
x
x
x
x
DACA9
DACA8
Bits DACA9-8 Address for writing the DAC data to the circular buffer of signal generator with the use of the DAC.
Buffer length amounts to 1024 DAC readouts. Code and number of DAC channel are written.
+14
R\W
Configuration of the operation mode of signal generator (DAG)
Bit #
7
6
5
4
3
2
1
0
Name
WGSRC
1
WGSRC
0
WGCH1
WGCH0
DEPTH3 DEPTH2 DEPTH1 DEPTH0
Bits DEPTH 3-0 Define the buffer size used. Depth = [DEPTH(3-0)+1]*64.
Bits WGCH1-0 Define the number of words to be transferred at a single session to DAC. 00
– 1 word, 01 – 2 words, 1х
– 4 words.
Bits WGSRC 1-0 Define DAC clocking source. 00
– manual, using the WGINC register, 01 – output of counter 0 8254,
10
– output of counter 12 8254, 11 – external, foot 45.
+15
R\W
Установка конфигурации ЦАП
Bit #
7
6
5
4
3
2
1
0
Name
DAC_off
DAG1_1
DAG1_0
DAG0_1
DAG0_0
DAPOL1
DAPOL0
Bits DAPOL1-0 = 1, bipolar output DAC 2-3 and 0-1, respectively.
Bit DAG1_1-0 (DAG0_1-0)
– selection of the DAC conversion range 2-3 (0-1). 00 – 5V, 01 – 10V, 10 – 20V, 11 – DAC
is enabled. * also see the rules for range switching.
Bit DAC_OFF
– setting the bit to one leads to the disabling outputs from DAC and their PE via 10 kOhm.
* Rules for switching the DAC ranges
DAC output voltage, V
Conversion range, V
DAG [1:0]
DAPOL
0..5 V
5
[00]
0
0..10 V
10
[01]
0
±2,5 V
5
[00]
1
±5 V
10
[01]
1
±10 V
20
[10]
1
1.3.9 Summary table of registers
Base +
Read
Write
+0
Reading ADC data, the least
significant byte
Software-based start of ADC
conversion.
+1
Reading ADC data, the most significant byte
+2
Minor number of ADC channel in
the scanning mode
Minor number of ADC channel in
the scanning mode
+3
Major number of ADC channel in
the scanning mode
Major number of ADC channel in
the scanning mode
+4
FIFO flags + ADC state
ADC control
+5
DAC state
DAC control
+6
Data update in all the 4 DAC
channels.
The least significant byte of DAC
+7
The most significant DAC byte
+8
Current page
Board control system
+9
Digital port reading
Control of interrupts and digital
port
+10
State of the 8254 timer
Control of inputs/outputs of 8254
