Low-Cost Logic Analyzer for FPGAs

摘要

Imagine being able to look inside your FPGA to see what it's doing. Now imagine doing so at a reasonable cost! You can do it all with Philip's Excel logic analyzer (ELA). Last December, I described my Spartan-3 experimenter's board (SEB3) to show you how easy it is to design with an FPGA ("An FPGA Experimenter's Board," Circuit Cellar, 173, 2004). One of the great things about Xilinx's small Spartan-3 FPGA is that its tools are free. But what happens when you need to debug your design? How do you debug a design embedded in the FPGA?