# gokulp50/lin architecture

> Architecture diagram of the GitHub repository gokulp50/lin, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-26). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/gokulp50/lin
- Repository: https://github.com/gokulp50/lin

## Overview

This is a SystemVerilog LIN 2.1 controller supporting Master and Slave communication, with RTL modules for transmission, reception, checksum, and baud generation. Its documented workflow is LIN frame communication through the controller, with UART TX/RX and checksum handling. The repository also includes testbenches for controller and component verification. Source excerpts were unavailable, so internal wiring and detailed testbench behavior are not asserted beyond the README and file names.

Main entry points: [`rtl/lin_controller.sv`](https://github.com/gokulp50/lin/blob/main/rtl/lin_controller.sv) (LIN controller), [`rtl/lin_tx.sv`](https://github.com/gokulp50/lin/blob/main/rtl/lin_tx.sv) (Frame transmitter), [`rtl/lin_rx.sv`](https://github.com/gokulp50/lin/blob/main/rtl/lin_rx.sv) (Frame receiver), [`rtl/lin_checksum.sv`](https://github.com/gokulp50/lin/blob/main/rtl/lin_checksum.sv) (Checksum logic)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_rtl["LIN Controller RTL"]
  node_controller["LIN controller<br/>[lin_controller.sv]"]
  node_tx["Frame transmitter<br/>[lin_tx.sv]"]
  node_rx["Frame receiver<br/>[lin_rx.sv]"]
  node_checksum["Checksum logic<br/>[lin_checksum.sv]"]
  node_baud["Baud generator<br/>[lin_baud_gen.sv]"]
end

subgraph group_verification["Verification"]
  node_controller_tb["Controller testbench"]
  node_tx_tb["TX testbench<br/>[lin_tx_tb.sv]"]
  node_rx_tb["RX testbench<br/>[lin_rx_tb.sv]"]
  node_checksum_tb["Checksum testbench<br/>[lin_checksum_tb.sv]"]
  node_baud_tb["Baud testbench<br/>[baud_tb.sv]"]
  node_lin_tb["LIN verification bench<br/>[lin.sv]"]
end

node_peer(("LIN peer"))

node_peer -->|"exchanges frames"| node_controller
node_controller -->|"transmits frames"| node_tx
node_controller -->|"receives frames"| node_rx
node_controller -->|"validates checksum"| node_checksum
node_controller -->|"sets baud"| node_baud
node_controller_tb -->|"verifies"| node_controller
node_tx_tb -->|"verifies"| node_tx
node_rx_tb -->|"verifies"| node_rx
node_checksum_tb -->|"verifies"| node_checksum
node_baud_tb -->|"verifies"| node_baud

click node_controller "https://github.com/gokulp50/lin/blob/main/rtl/lin_controller.sv"
click node_tx "https://github.com/gokulp50/lin/blob/main/rtl/lin_tx.sv"
click node_rx "https://github.com/gokulp50/lin/blob/main/rtl/lin_rx.sv"
click node_checksum "https://github.com/gokulp50/lin/blob/main/rtl/lin_checksum.sv"
click node_baud "https://github.com/gokulp50/lin/blob/main/rtl/lin_baud_gen.sv"
click node_controller_tb "https://github.com/gokulp50/lin/blob/main/tb/lin_controller_tb.sv"
click node_tx_tb "https://github.com/gokulp50/lin/blob/main/tb/lin_tx_tb.sv"
click node_rx_tb "https://github.com/gokulp50/lin/blob/main/tb/lin_rx_tb.sv"
click node_checksum_tb "https://github.com/gokulp50/lin/blob/main/tb/lin_checksum_tb.sv"
click node_baud_tb "https://github.com/gokulp50/lin/blob/main/tb/baud_tb.sv"
click node_lin_tb "https://github.com/gokulp50/lin/blob/main/tb/lin.sv"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_controller,node_tx,node_rx,node_checksum,node_baud toneBlue
class node_controller_tb,node_tx_tb,node_rx_tb,node_checksum_tb,node_baud_tb,node_lin_tb toneAmber
class node_peer toneIndigo
```

## Components

### LIN Controller RTL

- [LIN controller](https://github.com/gokulp50/lin/blob/main/rtl/lin_controller.sv): `rtl/lin_controller.sv`
- [Frame transmitter](https://github.com/gokulp50/lin/blob/main/rtl/lin_tx.sv): `rtl/lin_tx.sv`
- [Frame receiver](https://github.com/gokulp50/lin/blob/main/rtl/lin_rx.sv): `rtl/lin_rx.sv`
- [Checksum logic](https://github.com/gokulp50/lin/blob/main/rtl/lin_checksum.sv): `rtl/lin_checksum.sv`
- [Baud generator](https://github.com/gokulp50/lin/blob/main/rtl/lin_baud_gen.sv): `rtl/lin_baud_gen.sv`

### Verification

- [Controller testbench](https://github.com/gokulp50/lin/blob/main/tb/lin_controller_tb.sv): `tb/lin_controller_tb.sv`
- [TX testbench](https://github.com/gokulp50/lin/blob/main/tb/lin_tx_tb.sv): `tb/lin_tx_tb.sv`
- [RX testbench](https://github.com/gokulp50/lin/blob/main/tb/lin_rx_tb.sv): `tb/lin_rx_tb.sv`
- [Checksum testbench](https://github.com/gokulp50/lin/blob/main/tb/lin_checksum_tb.sv): `tb/lin_checksum_tb.sv`
- [Baud testbench](https://github.com/gokulp50/lin/blob/main/tb/baud_tb.sv): `tb/baud_tb.sv`
- [LIN verification bench](https://github.com/gokulp50/lin/blob/main/tb/lin.sv): `tb/lin.sv`

### Other components

- **LIN peer**

## Connections

- LIN peer → LIN controller: exchanges frames
- LIN controller → Frame transmitter: transmits frames
- LIN controller → Frame receiver: receives frames
- LIN controller → Checksum logic: validates checksum
- LIN controller → Baud generator: sets baud
- Controller testbench → LIN controller: verifies
- TX testbench → Frame transmitter: verifies
- RX testbench → Frame receiver: verifies
- Checksum testbench → Checksum logic: verifies
- Baud testbench → Baud generator: verifies