XC228X_08 Datasheet, PDF (67/125 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance

XC2287 / XC2286 / XC2285
XC2000 Family Derivatives
Functional Description
3.12
MultiCAN Module
The MultiCAN module contains up to five independently operating CAN nodes with Full-
CAN functionality which are able to exchange Data and Remote Frames using a
gateway function. Transmission and reception of CAN frames is handled in accordance
with CAN specification V2.0 B (active). Each CAN node can receive and transmit
standard frames with 11-bit identifiers as well as extended frames with 29-bit identifiers.
All CAN nodes share a common set of up to 128 message objects. Each message object
can be individually allocated to one of the CAN nodes. Besides serving as a storage
container for incoming and outgoing frames, message objects can be combined to build
gateways between the CAN nodes or to set up a FIFO buffer.
The message objects are organized in double-chained linked lists, where each CAN
node has its own list of message objects. A CAN node stores frames only into message
objects that are allocated to its own message object list and it transmits only messages
belonging to this message object list. A powerful, command-driven list controller
performs all message object list operations.
MultiCAN Module Kernel
Clock
f_{C AN}
Control
Address
Decoder
Message
Object
Buffer
128
Objects
Linked
List
Control
CAN
Node 4
TX DC4
RXDC4
.
.
.
.
.
.
.
.
.
CAN
Node 1
TX DC1
Port
RXDC1 ^Control
CAN
Node 0
TX DC0
RXDC0
Interrupt
Control
CAN Control
Figure 11 Block Diagram of MultiCAN Module
m c_ m u ltica n _ b lo ck5 .vsd
Data Sheet
65
V2.1, 2008-08