How the hardware multiplies matrices

A matrix unit is a grid of multiply-accumulate cells that pass numbers to their neighbours every clock cycle: each operand is fetched from memory once and used by a whole row or column of cells. This site takes that machine apart one cycle at a time: which operand stays put, how the inputs are skewed so everything meets at the right moment, and where the cycles go.

Every animation is drawn from a cycle-accurate model of the array (Python reference, exact TypeScript port). Its output-stationary frames match a SystemVerilog array simulated in Verilator on every accumulator after every clock edge: 613 values, 0 mismatches.