784 Tiny Tapeout Accumulator
784 : Tiny Tapeout Accumulator
- Author: Alp Bolukbasi
- Description: A simple event accumulator that counts input pulses and outputs a 4-bit activity value.
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 1000000 Hz
Tiny Tapeout Accumulator
Project Overview
Title: Tiny Tapeout Accumulator
Author: Alp Bolukbasi
GitHub / Wokwi ID: 455300931094822913
How it works
This project implements a very simple event accumulator.
The design monitors a single digital input (in) while a clock (clk) is running. Each rising edge of the input increments an internal counter.
The current activity count is then encoded as a 4‑bit value on the output pins out0 through out3.
This illustrates a minimal stream processing block with no complex control logic.
How to test
- Provide a clock (e.g., 1 MHz) and active‑low reset (
rst_n). - Drive the
inpin with pulses or a button in a Wokwi simulation. - Observe the output pins:
out0–out3reflect the accumulated count of events.
- Optionally, run a simple Verilog testbench (e.g., with Verilator or Icarus Verilog) to verify the counter behavior.
Pinout reference
| Pin | Name | Description |
|---|---|---|
| ui[0] | clk | System clock input |
| ui[1] | rst_n | Active-low reset |
| ui[2] | in | Input event signal |
| uo[0] | out[0] | Activity output bit 0 |
| uo[1] | out[1] | Activity output bit 1 |
| uo[2] | out[2] | Activity output bit 2 |
| uo[3] | out[3] | Activity output bit 3 |
Other pins are unused.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | clk | out0 | |
| 1 | rst_n | out1 | |
| 2 | in | out2 | |
| 3 | out3 | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |