MAC7200 datasheet(584/976 Pages) FREESCALE

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The Generic FlexCAN2 Module

MAC7200 Microcontroller Family Reference Manual, Rev. 2

506

Freescale Semiconductor

Figure 28-1. FlexCAN Block Diagram

28.2.2

Overview

The CAN protocol was primarily, but not only, designed to be used as a vehicle serial data bus, meeting

the specific requirements of this field: real-time processing, reliable operation in the EMI environment of

a vehicle, cost-effectiveness and required bandwidth. The FlexCAN module is a full implementation of the

CAN protocol specification, Version 2.0 B [Ref. 1], which supports both standard and extended message

frames. A flexible number of Message Buffers (16, 32 or 64) is also supported. The Message Buffers are

stored in an embedded RAM dedicated to the FlexCAN module. On the MAC72xx, there are 32 Message

Buffers for each FlexCAN module.

The CAN Protocol Interface (CPI) sub-module manages the serial communication on the CAN bus,

requesting RAM access for receiving and transmitting message frames, validating received messages and

performing error handling. The Message Buffer Management (MBM) sub-module handles Message

Buffer selection for reception and transmission, taking care of arbitration and ID matching algorithms. The

Bus Interface Unit (BIU) sub-module controls the access to and from the internal interface bus, in order to

288/544/1056-

Bus Interface Unit

max MB #

(0–31)

IP Bus Interface

CAN

Message

CAN Tx

CAN Rx

MB1

MB0

MB30

MB31

Clocks, Address & Data buses,

Interrupt and Test Signals

Buffer

Management

Protocol

Interface

byte RAM

Message

Buffer

Storage

64/128/256-

RXIMR1

RXIMR0

RXIMR30

RXIMR31

byte RAM

ID Mask

Storage

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