18-224 Student Designs Spring 2023
This repository contains the tapeout infrastructure and student designs from the Spring 2023 18-224/18-624/98-154 course "Intro to Open-Source Chip Design" at Carnegie Mellon.
(For questions or interest, email me: anish [at] anishsinghani [dot] com)
The Course
The course was run for the first time in Spring 2023 as a way to introduce students to chip design who might not otherwise get that exposure and give them an opportunity to do mini-tapeout project. Students were taught a variety of tools including Yosys, OpenLANE/OpenROAD, NextPNR, Verilator, CocoTB, MCY, Chisel, Amaranth, LiteX, and more.
The course culminated in a final project where students were given a limited area (equivalent to ~4000 standard cells) in which to design a chip of their choosing. Students chose a variety of projects ranging from games to CPUs to accelerators.
The Chip
The final chip, taped out through the Skywater foundry (via the Efabless ChipIgnite program), is comprised of all student designs merged together, along with a multiplexer unit to share the limited I/O ports amongst all of the designs. Each design is given 12 outputs, 12 inputs, and a dedicated clock and reset signal.
Index of Designs
Following is a list of student designs on the chip, along with the design indices (The des_sel pins on the chip are used to enable a particular design).
Designs #1-#7 are example designs and test-structures used for teaching purposes. #10-#30 are student designs from the Spring 2023 course, and #31-#43 are from a similar workshop taught in Fall 2022.
| Index | Project | Student | Link |
|---|---|---|---|
| 1 | 6-Bit Combinational Adder | (demo) | d01_example_adder |
| 2 | 12-Bit Counter | (demo) | d02_example_counter |
| 3 | "Beep Boop" Traffic Light Controller | (demo) | d03_example_beepboop |
| 4 | AES-128 Side-Channel Model | (demo) | d04_example_aes128sca |
| 5 | Tapeout Meta-Info | (demo) | d05_meta_info |
| 6 | Pong Game with VGA | (demo) | d06_demo_vgapong |
| 7 | Endless Runner Game with VGA | (demo) | d07_demo_vgarunner |
| 10 | Tic-Tac-Toe Game | Wahib Abib | d10_wabib_tictactoe |
| 11 | Brainfuck CPU | Gary Bailey | d11_gbailey_bfchip |
| 12 | I2C Peripheral | Owen Ball | d12_oball_i2c |
| 13 | S444 FPGA Logic Cell | Jack Duvall | d13_jrduvall_s444 |
| 14 | Traffic Light Controller | Jessie Fan | d14_jessief_trafficlight |
| 15 | Pseudo Random Number Generator | Jerry Feng | d15_jerryfen_prng |
| 16 | Digital Phase Locked Loop | Joel Gonzalez | d16_bgonzale_pll |
| 17 | Tetris Game | Navod Jayawardhane | d17_njayawar_tetris |
| 18 | Multiply-Accumulate Unit | Nikhil Dinkar Joshi | d18_nikhildj_mac |
| 19 | Encryption Unit (custom cipher) | Roman Kapur | d19_rdkapur_encryptor |
| 20 | Simplified Tetris Game | Rashi Kejriwal | d20_rashik_tetris |
| 21 | Motor Controller | Varun Kumar | d21_varunk2_motorctrl |
| 22 | Convolution Accelerator | Yushuang Liu | d22_yushuanl_convolution |
| 23 | Turing Machine | Ying Meng | d23_zhiyingm_turing |
| 24 | Tensor Processing Unit | M Nguyen | d24_mnguyen2_tpu |
| 25 | Huffman Encoder | Anusha Raghavendra | d25_araghave_huffman |
| 26 | Trainable Perceptron | Christopher Stange | d26_cjstange_perceptron |
| 27 | Floating Point Unit | Sri Lakshmi Vemulapalli | d27_svemulap_fpu |
| 28 | Microcoded CPU | Ganesh Venkatachalam | d28_gvenkata_ucpu |
| 29 | Intel 8008-based CPU | Brendan Wilhelm | d29_bwilhelm_i8008 |
| 30 | Tiny FPGA | Yu-Ching Wu | d30_yuchingw_fpga |
| 31 | Linear Feedback Shift Register | Mihir Dhamankar | d31_mdhamank_lfsr |
| 32 | 4-bit CPU | Noah Gaertner | d32_ngaertne_cpu |
| 33 | Adder Architecture in Wokwi | Michael Gee | d33_mgee3_adder |
| 34 | Collatz Sequence Computer | Harrison Grodin | d34_hgrodin_collatz |
| 35 | Magnitude Comparator | Caroline Kasuba | d35_ckasuba_comparator |
| 36 | Floating Point Multiplier | Joseph Li | d36_jxli_fpmul |
| 37 | Calculator Chip | Sophia Li | d37_sophiali_calculator |
| 38 | PWM Signal Generator | Jason Lu | d38_jxlu_pwm |
| 39 | Hex to Seven-Segment | Kachi Onyeador | d39_oonyeado_sevenseg |
| 40 | Clock Domain Crossing FIFO | Jon Recta | d40_jrecta_asyncfifo |
| 41 | "Corral" Game | Michael Stroucken | d41_stroucki_corralgame |
| 42 | Hex to Seven-Segment | Samuel Sun | d42_qilins_sevenseg |
| 43 | Counter | Mason Xiao | d43_mmx_counter |
Multiplexer Documentation
TODO
Bringup Instructions
TODO