![]() It also uses 3 2-input blocks to create a 4-input one. The approach is the digital twin of shabaz ' Building an RF Switching Unit. Check it out, because they also show a single-block 4-input multiplexer. In this post, I'll use the 4 buttons on my Pynq board as inputs, and an LED as output.Ī register (It's a Zynq device, so I like to combine ARM and FPGA) will define what input is multiplexed to the output, and thus drives the LED state. A pin can be a GPIO, an I2C clock in, a SPI chip select, a timer. You'll find it in microcontrollers where you can choose the function of the pins. There will always be one of them connected to the output. You can compare it to the source selector of your stereo system, where you can switch inputs between radio, CD player. The 4-input multiplexer shown here is made out of 3 of these 2-input blocks.Ī multiplexer is a device that allows you to select one input and send that to the output. ![]() In this post I'm showing that you can make a 4-input multiplexer by combining several 2-input multiplexers.Ī 2-input multiplexer is a simple digital building block. ![]() Build a big multiplexer by reusing small multiplexers.įPGA designs are (re)usable as components. ![]()
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