Tiny Computers GitHub

tiny-tpu

Live

A real 4×4 systolic array, compiled to WebAssembly. Every cell is a signal from the chip.

Run it liveHow the RTL reaches the browserSource

Explore the idea.

A 3×3 matrix multiply on a wavefront of cells. A cell multiplies and accumulates when its inputs reach it. This sketch uses a simpler schedule than the RTL, which keeps weights in the cells. The live visualizer runs the real hardware.

Interactive illustration · Simplified model

What it shows.

Verilator turns the SystemVerilog into C++, and Emscripten compiles that into one WebAssembly file of about 161 KB.

The visualizer reads each cell's signals from that module every cycle, so the numbers on screen come from the chip and not from a picture of it.

Inside the live visualizer.

Stills from the recording of the real visualizer, and the visualizer's own controls.

Early in the run: Cells start filling as the first values stream in.
Early in the run. Cells start filling as the first values stream in.
Mid-run: Partial sums accumulate across the array.
Mid-run. Partial sums accumulate across the array.
Late in the run: The wavefront has reached the bottom-right cells.
Late in the run. The wavefront has reached the bottom-right cells.
The controls: Matrix sizes, cycle controls and the speed setting.
The controls. Matrix sizes, cycle controls and the speed setting.