![]() Each LED in the numeral can be turned on or off in some kind of pattern to simulate human-readable numbers.īecause there are seven LEDs in the numeral, you would need seven individual inputs to define the pattern of LEDs correctly. To take an initial step back and gain some perspective a seven segment display is typically an assembly of eight LEDs, arranged in a numeral shaped like the number eight, with a decimal point thrown in for good measure. ![]() Rather than buy an older second-hand decoder IC, I fell down the rabbit hole of programming a PLD device to accomplish the task.įor the TL:DR crowd, See my Hex_To_Seven_Segment_Decoder repository on Github for the compiled “.jed” file and WinCUPL project files.Ĭontinue reading for some lengthy background to the problem and a derivation of the PLD code. ![]() In seeking to improve my ISA POST card design, I became frustrated at the general lack of modern seven segment display decoders that could decode and display a hexadecimal output.
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