Last month, I showed you how easy it is to build logic circuits using a Xilinx CPLD (Complex Programmable Logic Device). This month, we'll dig into a more sophisticated design. In particular, I'll show you how to build a useful piece of test equipment — a "logic scope." This is a poor man's logic analyzer. The logic scope reads four bits of digital data, records them, and then displays the waveforms on a normal oscilloscope.
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