CANB_W - Wishbone CAN Controller with Direct Addressing

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Figure 1. CANB_W - Wishbone CAN Controller with Direct Addressing.

The CAN Controller component (CANB_W) is a stand-alone, Wishbone-compliant controller, for a Controller Area Network conforming to the CAN 2.0B specification. It provides an interface between a processor and a CAN bus. The Controller implements the BOSCH CAN 2.0B Data Link Layer Protocol.

The CAN Controller is compatible with the Philips SJA1000 working in its PeliCAN mode.

Supply of these soft cores under the terms and conditions of the Altium End-User License Agreement does not convey nor imply any patent rights to the supplied technologies. Users are cautioned that a license may be required for any use covered by such patent rights.

Features at-a-glance

  • Supports Standard Frame Format (11-bit identifier) and Extended Frame Format
    (29-bit identifier)
  • 64-byte Receive FIFO with 13-byte window (Receive Buffer) pointing to first message to be read from FIFO
  • Data Overrun control
  • Received Message Counter
  • Receive Buffer Start Address Register reflecting the current position where the first byte of the received message is stored
  • 13-byte Transmit Buffer
  • Compound, programmable Acceptance Filter
    • Single and Dual Acceptance Filter mode
    • 4-byte code
    • 4-byte mask
    • Access to bit-position in message identifier where arbitration lost occurred.
  • Error Confinement
    • Error Receive and Transmit Counters with read and write access
    • Programmable Error Warning Limit
    • Access to last error code that informs about type of error that occurred and error position in bit-stream.
  • Listen Only Mode – CAN Controller has no influence on CAN bus, no active error flags, no overload flags and no acknowledgments can be sent, but it can receive messages.
  • Self Test Mode with Self Reception Request – full node test possibility without any other active node; message acknowledgement is not required and transmission with simultaneous reception possible.
  • Single Shot Transmission – no re-transmission required
  • Sleep Mode with reduced power consumption.
    • Programmable Bit Timing Logic
    • Programmable Bit Rate
    • Programmable ClockOut Period
    • Programmable bit-period length – TSeg1, TSeg2
    • Programmable Synchronization Jump Width
    • Single- and triple- sampling modes.
  • Output Modes
    • Normal mode
    • ClockOut mode
    • Biphase mode
    • Test mode
    • Receive interrupt output enable (in normal mode).
  • Input Modes
    • Normal mode
    • Test mode.
  • Compound and Flexible Interrupt Structure.
  • Wishbone-compliant


From an OpenBus System document, the CAN Controller (B) component can be found in the Peripherals region of the OpenBus Palette panel.

From a schematic document, the CANB_W component can be found in the FPGA Peripherals (Wishbone) integrated library (FPGA Peripherals (Wishbone).IntLib), located in the \Library\Fpga folder of the installation.

Designing with the CANB_W

Use the following links to explore use of the CANB_W in more detail:

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