Vending Machine Controller – RTL Design

This project is a Verilog RTL-based implementation of a configurable vending machine controller. It simulates a real vending system, supporting dynamic item setup, asynchronous user input, and real-time dispensing logic.

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Features

• Supports up to 1024 unique items
• APB-like configuration interface (10 MHz)
• Real-time operation mode on a 100 MHz system clock
• Handles asynchronous currency and item select inputs (10 kHz – 50 MHz)
• Dispenses items within 10 system clock cycles
• Returns change if overpaid
• Modular and clean RTL architecture

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🔁 Operating Modes

1. Reset Mode

• Initializes all internal memories and registers.

2. Configuration Mode

• Item setup via APB-like interface:
  • Set total items
  • Configure item price
  • Set availability
• Configuration data is safely synchronized from pclk to system_clk.

3. Operation Mode

• Processes currency and item selection.
• Compares inserted amount with item price.
• Dispenses item and returns change if needed.
• Ensures vending decision in under 10 cycles.

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📂 Module Overview

• fsm: Controls system mode transitions (Reset, Config, Operation)
• cfg_block: Handles APB-based configuration and clock domain crossing
• operation_controller: Performs runtime vending logic
• vending_machine_top: Top-level integration and memory coordination

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