CAN-FD Controller

The Controller Area Network (CAN) is a highly reliable serial bus protocol defined in the Bosch CAN specifications for standard CAN 2.0B and CAN FD, as well as ISO 11898-1:2024.

The TES CAN Flexible Data-Rate Controller IP core is a Hardware IP core written in VHDL. The core is intended for use in a System-on-Chip (SoC) environment. It can be integrated into a wide range of applications and target technologies. The code is synthesizable for Application Specific Integrated Circuits (ASIC) and Field Programmable Gate Arrays (FPGA).

Technology Details

MAC Device

The TES CAN FD Controller IP core is a device positioned in the OSI model in the Medium Access Control (MAC) sublayer section of the Data Link Layer (Layer 2).

The main tasks of an MAC layer device are:

• Message framing.
• Transmission and reception of frames.
• Arbitration.
• Error detection and signaling.
• Fault confinement.
• Bit timing and synchronization.

Logical Link Control (LLC) Support

To achieve a high application flexibility for this core, the acceptance filtering and buffering of received messages is provided for Logical Link Control (LLC, part of layer 2 of the OSI model) sublayer application support, which may be implemented using hardware, software, or a combination of both.

Interface Configurations

The TES CAN FD Controller IP core can be integrated into SoC device or other applications using one of the following configurations:

• Core interface with a memory interface.
• Core interface double buffers for transmit and receive. Data interface to the double buffers.
• BUS / AMBA AXI interface for access via internal SoC bus.

The RX Filter can be added in each variant.

• CAN Flexible Data-Rate (FD) protocol compatible (ISO 11898-1:2024) 
• Supported Frame Formats: 
  • CAN Base: 11-bit Identifier and constant bit rate 
  • CAN Extended: 29-bit Identifier and constant bit rate 
  • CAN Base Remote: 11-bit Identifier and constant bit rate 
  • CAN Extended Remote: 29-bit Identifier and constant bit rate 
  • CAN FD Base: CAN Base format with dual bit rate 
  • CAN FD Extended: CAN Extend with dual bit rate 
• Data rates: 
  • Up to 1 Mbit/s for CAN 2.0B 
  • Up to 8 Mbit/s for CAN FD 
• Payload sizes: 
  • CAN Base/Extended: 0...8 bytes 
  • CAN FD Base/Extended: 0…64 bytes 
• Clock Prescaler provides a wide frequency range 
• Flexible interface configurations 
• RX frame filter 
• Verified to ISO 16845-1 (Road vehicles – Controller area network conformance test plan -) 
• Used Bosch CAN FD Reference model 
• CAN FD verified with FPGA evaluation board