Most electronics are now designed with Hardware Description Languages (HDL) like [Verilog](https://en.wikipedia.org/wiki/Verilog) on [FPGA](https://en.wikipedia.org/wiki/Field-programmable_gate_array)s (Field Programmable Gate Array)s. You write code to tell the FPGA what the system should do and the FPGA emulates the required electronics, spitting out the resulting logic that goes into fabrication.
It gets a little more interesting when engineers then make alterations by hand so their silicone is more efficient and designs are much harder to emulate. Apple are particularly well known for doing this with their M series of processors
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