Alinx AX301 User Manual page 30

Figure 15-1: Digital tube segment structure
We use a common anode digital tube.
field is low, the corresponding field is lit, and when the pin corresponding
to a field is high, the corresponding field is not lit.
Having said the schematic diagram above, let's look at the design on
FPGA development board.
The six-in-one digital tube is a dynamic display. Due to the persistence of
human vision and the afterglow effect of light emitting diodes, although the
digital tubes are not lit at the same time, as long as the scanning speed is fast
enough, the impression is a group Stable display data without flickering.
The same sections of the six-in-one digital tube are connected together,
with a total of 8 pins, and then 6 control signal pins are added, and a total of 14
pins, as shown in Figure 15-2. Among them DIG [0..7] is A, B, C, D, E, F, G, H
(ie point DP) corresponding to the digital tube; SEL [0..5] is the six controls of
the six digital tubes The pin is also active low. When the control pin is low, the
corresponding digital tube has a power supply voltage so that the digital tube
can light up. Otherwise, no matter how the segment of the nixie tube changes,
the corresponding nixie tube cannot be lighted.
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FPGA Development Board AX301 User Manual
When the pin corresponding to a
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