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Example Hardware Designs to Try

Basic Combinational Logic

Simple Gates & Operations

  • 4-bit adder with carry out
  • 8-bit subtractor
  • 4-bit AND gate
  • 2-bit XOR gate
  • 8-to-1 multiplexer
  • 3-to-8 decoder
  • 4-to-2 priority encoder

Arithmetic

  • 4-bit multiplier
  • 8-bit comparator
  • Absolute value circuit for 8-bit signed input
  • Min/max finder for two 8-bit inputs
  • Divider by 3 for 8-bit input

Data Processing

  • Barrel shifter for 8-bit input
  • Leading zero counter for 8-bit input
  • Population counter that counts 1s in an 8-bit value
  • Parity generator for 8-bit input
  • Gray code to binary converter
  • Binary to Gray code converter

Specialized

  • 7-segment display decoder for 4-bit BCD input
  • CRC-8 calculator
  • Hamming code encoder for 4-bit data
  • Even parity checker

Sequential Logic (with clocks)

Counters

  • 2-bit counter with enable
  • 4-bit up/down counter
  • Decade counter (0-9)
  • Ring counter

State Machines

  • Traffic light controller with 3 states
  • Vending machine controller accepting nickels and dimes
  • Sequence detector for pattern 1011
  • Debounce circuit for button input

Memory & Registers

  • 4-bit shift register
  • FIFO buffer with 4 entries
  • 8-bit register file with 4 registers

Communication

  • UART transmitter
  • SPI controller
  • I2C state machine

Tips

  • Start simple (gates, adders, muxes)
  • Combinational logic usually works on first attempt
  • Sequential logic with clocks may take a few iterations
  • Be specific about bit widths
  • Describe expected behavior clearly

Example Session

python3 agent.py

Then enter:

Population counter that counts the number of 1s in an 8-bit input

The agent will generate the design, testbench, compile, simulate, and open Surfer automatically.