For pulse density modulation if X is too big – say, if you have a minimum time increment of 1 microsecond, and your period is 256 microseconds, and X is greater than 128 – the line idles ...

Projects that don’t need an FPGA, ... a Pulse Width Modulation (PWM) generator. There are many ways to generate PWM. Imagine you are standing by a light switch in a dark room.