LM3S9DN6_16 Datasheet, PDF (54/1391 Pages) Texas Instruments – Stellaris LM3S9DN6 Microcontroller

Architectural Overview
1.3.4.2
– Full- and half-duplex 100 Mbps
– Full- and half-duplex 10 Mbps
■ Highly configurable
– Programmable MAC address
– Promiscuous mode support
– CRC error-rejection control
– User-configurable interrupts
■ Media Independent Interface (MII) for connection to external 10/100 Mbps PHY transceivers
■ IEEE 1588 Precision Time Protocol: Provides highly accurate time stamps for individual packets
■ Efficient transfers using Micro Direct Memory Access Controller (µDMA)
– Separate channels for transmit and receive
– Receive channel request asserted on packet receipt
– Transmit channel request asserted on empty transmit FIFO
Controller Area Network (see page 870)
Controller Area Network (CAN) is a multicast shared serial-bus standard for connecting electronic
control units (ECUs). CAN was specifically designed to be robust in electromagnetically noisy
environments and can utilize a differential balanced line like RS-485 or twisted-pair wire. Originally
created for automotive purposes, it is now used in many embedded control applications (for example,
industrial or medical). Bit rates up to 1 Mbps are possible at network lengths below 40 meters.
Decreased bit rates allow longer network distances (for example, 125 Kbps at 500m).
A transmitter sends a message to all CAN nodes (broadcasting). Each node decides on the basis
of the identifier received whether it should process the message. The identifier also determines the
priority that the message enjoys in competition for bus access. Each CAN message can transmit
from 0 to 8 bytes of user information.
The LM3S9DN6 microcontroller includes two CAN units with the following features:
■ CAN protocol version 2.0 part A/B
■ Bit rates up to 1 Mbps
■ 32 message objects with individual identifier masks
■ Maskable interrupt
■ Disable Automatic Retransmission mode for Time-Triggered CAN (TTCAN) applications
■ Programmable Loopback mode for self-test operation
■ Programmable FIFO mode enables storage of multiple message objects
■ Gluelessly attaches to an external CAN transceiver through the CANnTX and CANnRX signals
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July 03, 2014
Texas Instruments-Production Data