32-bit core, 64 kB SRAM, no cache.
32-bit core, 64 kB SRAM, no cache.
Signal, ground, power, and a keep-out nobody respects.
1.6 mm FR-4, routed in Eagle, fabbed in Shenzhen.
Every corner has a name. Half of them are lies.
Almost every printed board is laid out by a program: components are placed, and then an autorouter walks a path between the pins, turning at right angles where the rules say it must. The result is not beautiful, but it is unmistakably of its kind — the geometry of a thing that has to work.
This page routes traces on a grid with ninety-degree turns and vias where two layers have to meet. The pads are real chip footprints, and the signal genuinely travels from the input pad to the output pad, because the router checks that it can.