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FPGA ESD protection



I notice that the newest digilent boards (e.g ARTY-S7 and ARTY-A7) dont have the TVS diodes on the GPIO connectors, but the oldest boards (e.g. NEXYS 4 DDR) have the TVS diodes on the GPIO connectors. I suppose that Digilent decided to use the FPGA I/O internal body diodes, hence the external ones are not needed, or is just a cost issue?



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