Figure 4-3. Timing Circuitry - National Instruments DAQCard-1200 User Manual

Chapter 4 Theory of Operation
GATEB2
CLKB2
OUTB2
GATEB1
CLKB1
OUTB1
OUTB0
GATEB0
EXTCONV*
EXTTRIG
EXTUPDATE*
DAQCard-1200 User Manual
GATEB2
CLKB2
General-
Purpose
Counter
OUTB2
GATEB1
CLKB1
Scan
MUX
Interval/
General-
Purpose
Counter
0 A K L C
OUTB1
OUTB0
GATEB0
Timebase
Extension/
General-
Purpose
Counter
2 MHz
Source
CLKB0
82C53 Counter/Timer
Group B
OUTB1
A/D Conversion Logic
D/A Conversion Logic
OUTB0
1 MHz Source
MUX
+5 V
82C53 Counter/Timer

Figure 4-3. Timing Circuitry

4-4
CTR RD
CTR WRT
Data
8
CLKA0
GATEA0
Sample
Interval
Counter
OUTA0
CLKA1
Sample
Counter
GATEA1
OUTA1
CLKA2
GATEA2
DAC
Timing
OUTA2
Group A
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