It is suitable for counters, translations, etc. Among them, ABEL is a simple hardware description language that supports logical descriptions such as Boolean equations, truth tables, and state machines. The commonly used hardware description languages are ABEL, VHDL, Verilog, etc. It is now widely used in the PLD design process, and there are The trend is even more popular. The language description may accurately and concisely represent the logic function of the circuit. However, the circuit diagram description method cannot be concise the hardware description language description is another description method for programmable device design. The schematic description is an intuitive and convenient method, which can directly implement the functions realized by existing small-scale integrated circuits with PLD devices, and It is not necessary to describe existing circuits in language. The logic function description of PLD devices is generally divided into schematic description and hardware description language description.
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