CAN PROTOCOLCAN PROTOCOLCharacterization PresentationCharacterization Presentation

CAN PROTOCOLCAN PROTOCOLCharacterization PresentationCharacterization Presentation

supervisor : Oren Kerem supervisor : Oren Kerem

performer :

Ohad Gidon , Ilan Degani

performer :

Ohad Gidon , Ilan Degani

Block Diagram

Computer

ALTERA

Led

PS

Newelement

CA

N Tran

TranOld vhdl

PCIconnection

CAN protocol major characterizationmajor characterization

• System flexibility - Nodes may be added to the CAN without requiring any change .

• Multicast – any number of nodes may receive and act simultaneously upon the same message .

• Multi master – the node with the highest priority to be transmitted gains bus access .

• Data integrity – signaling and self checking in every CAN node .

• Fault confinement – defective node are switched off .

CAN Protocol- frames• There are four Frame type :

– Data frame :

– Remote frame :

SOF

ArbitrationField

DataField

CRCField

ACKField

EOF

12 Bit 6 Bit 0 to 8 Byte 16 Bit 2 Bit 7 Bit1Bit

ControlField

SOF

ArbitrationField

CRCField

ACKField

EOF

12 Bit 6 Bit 16 Bit 2 Bit 7 Bit1Bit

ControlField

CAN Protocol - frames– Error frame :

– Flags type:– Passive– Active

– Type of error :– Bit error– Stuff error– CRC error– Form error– Acknowledgement error

Error flagSuperposition of

error flagsError

Delimiter

8 Bit6 Bit

Max 12 Bit

CAN Protocol - frames– Overload frame :

– Interframe space :

intermission Bus idle

3 Bit3 Bit

intermission Bus idleSuspend

transmission

8 Bit

overload flagSuperposition of

overload flagsoverloadDelimiter

8 Bit6 Bit

Max 12 Bit

Block diagram• Top :

Block diagram• Nodes configuration

Block diagram• Slave_master

Block diagram• Receive

Block diagram• Transmit

Schedule

DATE DESCRIPTION

15.12.02-21.12.02 BUILD CONTROL BLOCK

22.12.02 – 11.01.03 TESTING THE EVALUATION BOARD

12.1.03 – 25.01.03 SIMULATION

26.1.03 – 03.02.03 SYNTHESYS + TEST THE PROGRAM ON THE EVALUATION BOARD