CAN Bus Transceiver Core (Verilog) Flowchart:

Start

1. Define Requirements:

   • Specify CAN bus bit rate (e.g., 500 kbps, 1 Mbps).
   • Choose a CAN transceiver IC (e.g., MCP2515, SN65HVD23x).

2. Design CAN Controller Modules:

   • Bit Timing Module:
     • Calculate Baud Rate Prescaler (BRP) and Synchronization Jump Width (SJW) based on requirements.
     • Generate control signals for Transmit and Receive logic based on bit timing.
   • Frame Handling Module:
     • Parse standard/extended IDs from received frames.
     • Handle data field (up to 8 bytes) for data frames.
     • Implement CRC (Cyclic Redundancy Check) calculation.
     • Perform bit stuffing and destuffing.
   • Transmit Logic Module:
     • Manage data transmission onto the CAN bus.
     • Implement CSMA/CD (Carrier Sense Multiple Access with Collision Detection) for arbitration.
     • Handle retransmission logic for errors.
     • Interface with CAN Transceiver Interface Module.
   • Receive Logic Module:
     • Capture data from the CAN bus.
     • Perform bit unstuffing.
     • Verify CRC of received data.
     • Extract information from the frame (ID, data, type).

3. Design CAN Transceiver Interface Module:

   • Transceiver Control Module:
     • Manage control pins of the CAN transceiver IC (mode, loopback, etc.).
   • Data Exchange Module:
     • Read data from CAN transceiver receive pins (CANH, CANL).
     • Send data to CAN transceiver transmit pins (CANH, CANL).

4. Develop Test Bench:

   • Stimulate CAN controller modules with test vectors (frames).
   • Verify module functionality (ID parsing, CRC, data handling).

5. Integration and Verification:

   • Integrate modules with CAN Transceiver Interface Module (initially simulated).
   • Connect modules with appropriate signals.
   • Refine design based on test bench results.

6. FPGA Implementation:

   • Synthesize Verilog code to generate FPGA configuration file.
   • Program the FPGA with the configuration file.
   • Integrate physical CAN transceiver IC with the FPGA board.

7. Testing and Validation:

   • Test the CAN transceiver core on a real CAN bus network.
   • Validate data transmission and reception functionality.
   • Verify error handling mechanisms.

8. Optimization (Optional):

   • Consider pipelining and state encoding for performance improvement.
   • Analyze resource utilization and optimize code if necessary.

End