🚀 FPGA-Based Limit Order Book

A high-performance, hardware-simulated order book modeled after modern exchange architecture — implemented in SystemVerilog.

📈 Features

• Supports ITCH-style ADD, UPDATE, DELETE messages
• Sorted bid/ask arrays (descending/ascending)
• Automatic compaction on delete
• Tracks best bid/ask price and quantity
• Fully testbenched with waveform inspection

📂 Project Structure

fpga-order-book/
├── rtl/
│ └── order_book.sv
│ └── parser_defs.sv
├── sim/
│ └── order_book_tb.sv
├── waveforms/
│ └── order_book_best_bid_ask.png
├── README.md
└── .gitignore

📊 Sample Waveform

💬 tcl-console output

------ BID SIDE ------
BID[0] ID:11111111 P:1000 Q:10
------ ASK SIDE ------
Best Bid: $0 (0 shares)
Best Ask: $0 (0 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:10
------ ASK SIDE ------
Best Bid: $1000 (10 shares)
Best Ask: $0 (0 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:10
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
Best Bid: $1050 (5 shares)
Best Ask: $0 (0 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:10
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:aaaaaaaa P:1100 Q:15
Best Bid: $1050 (5 shares)
Best Ask: $0 (0 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:10
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:bbbbbbbb P:1080 Q:10
ASK[1] ID:aaaaaaaa P:1100 Q:15
Best Bid: $1050 (5 shares)
Best Ask: $1100 (15 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:10
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:bbbbbbbb P:1080 Q:10
ASK[1] ID:aaaaaaaa P:1100 Q:15
ASK[2] ID:cccccccc P:1150 Q:5
Best Bid: $1050 (5 shares)
Best Ask: $1080 (10 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:999
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:bbbbbbbb P:1080 Q:10
ASK[1] ID:aaaaaaaa P:1100 Q:15
ASK[2] ID:cccccccc P:1150 Q:5
Best Bid: $1050 (5 shares)
Best Ask: $1080 (10 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:11111111 P:1000 Q:999
BID[2] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:bbbbbbbb P:1075 Q:11
ASK[1] ID:aaaaaaaa P:1100 Q:15
ASK[2] ID:cccccccc P:1150 Q:5
Best Bid: $1050 (5 shares)
Best Ask: $1080 (10 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:bbbbbbbb P:1075 Q:11
ASK[1] ID:aaaaaaaa P:1100 Q:15
ASK[2] ID:cccccccc P:1150 Q:5
Best Bid: $1050 (5 shares)
Best Ask: $1075 (11 shares)
----------------------

------ BID SIDE ------
BID[0] ID:22222222 P:1050 Q:5
BID[1] ID:33333333 P:990 Q:20
------ ASK SIDE ------
ASK[0] ID:aaaaaaaa P:1100 Q:15
ASK[1] ID:cccccccc P:1150 Q:5
Best Bid: $1050 (5 shares)
Best Ask: $1075 (11 shares)
----------------------

Testbench complete.