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CAN Controller

All Silicon IP

Overview

The CAN Controller is a synthesizable IP block providing Controller Area Network (CAN) functionality compliant with the CAN Specification Revision 2.0 Part B. Proven in high-volume standard devices from National Semiconductor, the CAN Controller features a programmable bit rate to support applications that require a high-speed (up to 1 Mbit/s) or a low-speed CAN interface. Fifteen message buffers, each configurable for transmit or receive, and programmable acceptance filtering provide support for both Full-CAN and Basic-CAN operation.

The host interface of the CAN Controller complies with the AMBA 2.0 APB protocol. Host-accessible control registers provide CPU control of bit rate, diagnostic functions, enabling/disabling the CAN Controller, CAN pin logic level, CAN bit time partitioning, incoming message filtering, transmit message prioritization, and enabling/disabling interrupts. Status registers provide CAN node, interrupt, and error/diagnostic status.

The CAN bus interface consists of serial transmit and receive signals that connect to an external transceiver through chip-level I/O pads. To reduce chip-level pin count, the transmit and receive signals can be shared with other on-chip functions through a General Purpose I/O (GPIO) Controller.

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