70353C datasheet(5/76 Pages) MICROCHIP

5 / 76 page

DS70353C-page 21-5

Section 21. Enhanced Controller Area Network (ECAN™)

The Acknowledgement (ACK) field is sent as a recessive bit (logic level ‘1’), and is overwritten

as a dominant bit by any receiver that has received the data correctly. The message is

acknowledged by the receiver regardless of the result of the acceptance filter comparison.

The last field is the EOF field, which consists of seven recessive bits that indicate the end of

message.

Figure 21-4:

Format of the Standard Data Frame

21.2.2

Extended Data Frame

The extended data frame begins with an SOF bit followed by a 31-bit Arbitration field as

illustrated in Figure 21-5. The Arbitration field in an extended data frame contains 29-bit identifier

in two fields separated by a Substitute Remote Request bit (SRR) and an IDE bit. The SRR bit

determines if the message is a remote frame (SRR = 1 for extended data frames). The IDE bit

indicates the data frame type. For the extended data frame, IDE = 1.

The extended data frame Control field consists of seven bits. The first bit is the RTR. For the

extended data frame, RTR = 0. The next two bits, RB1, and RB0, are reserved bits that are in

the dominant state (logic level ‘0’). The last four bits in the Control field are the DLC, which

specifies the number of data bytes present in the message.

The remaining fields in an extended data frame are identical to a standard data frame.

Figure 21-5:

Format of the Extended Data Frame

SID10

SID1

IDENTIFIER

11 Bits

RB0

DLC

4 Bits

DATA

8 Bytes

CRC

16 Bits

ACK

2 Bits

EOF

7 Bits

IFS

3 Bits

SID0

9/19/2006 - 9/26/2006

11-bit Identifier

Interframe Space

9/19/2006 - 9/26/2006

Data

9/19/2006 - 9/26/2006

- 9/26/2006

Frame

Interframe Space

9/19/2006 - 9/26/2006

IDE is Dominant (Logical ‘0’)

RTR is Dominant (Logical ‘0’)

RB0 is Dominant (Logical ‘0’)

/19/

Arbitration

Field

Control

Field

CRC

Field

ACK

Field

End-of-

SID10

SID1

IDENTIFIER

11 Bits

DLC

4 Bits

CRC

16 Bits

ACK

2 Bits

EOF

7 Bits

IFS

3 Bits

SID0

Field

29-bit Identifier

9/19/2006 - 9/26/2006

Control

9/19/2006 - 9/26/2006

CRC

9/19/2006 - 9/26/2006

IDENTIFIER

18 Bits

EID17

EID1 EID0

IDE is Recessive (Logical ‘1’)

SRR is Dominant (Logical ‘1’)

RTR is Dominant (Logical ‘0’)

RB0 is Dominant (Logical ‘0’)

RB1 is Dominant (Logical ‘0’)

9/19/2006 - 9/26/2006

ACK

End-of-

Frame

9/19/2006 - 9/26/2006

Data

DATA

8 Bytes

Arbitration

Field

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